Timber Frame

Mar ch 1998 1998

Bri ritt is ish h Gypsum Gypsum Guid uide e to Tim ber Fra ram m e Cons onstt ru ruc ct ion

Tim ber Fram e Cons Constt ruc ructt ion

Timber frame construction has a centuries–long tradition in the UK, however, over the last 80 years it has continuously evolved t o m ee eett t he challenges challenges of

c1560

changing Regulations and expectations. Currently, the UK population of modern timber frame dwellings is around 1 million and t he number number is

c1860

growing. Non–housing applications such as hotels, nursing homes, schools, and commun it y buil ding s, now acc ac count f or ove overr 30% 30% of t he UK UK Timb er Frame Frame Indust Indust ry ou t put .

1974

British Gypsum products are widely specified within timber frame buildings to form internal elements. Applications include linings to external walls, partitions, ceilings, separating and compartment f loo rs rs,, cavit cavit y barr iers and and ceilin gs below roo f spac paces es.. 1995

2

Tim ber Fram e Cons Constt ruc ructt ion

Contents

In t r o d u ct i o n

4

Co m p o n en t s

5

A p p l i cat i o n s

6

Per f o r m an ce

8

Per f o r m an ce t ab l es

9

Desi g n

15

Co n st ru ru ct io i o n d et ai ai l s

17

Bo ar d f ix ixi n g o n si t e

26

3

Tim ber Fram e Const ruct ion

Introduction

Your att ention is brought to t he follow ing publications whi ch give approved gui dance.

Timber fra med constru ctio n is being increasingly ado pted by a wide range of client groups because of its contribution to

4

energy ef ficiency. Typical applicati ons range from privat e dwellings through to hotels, nursing homes, and community buildings.

5

Wit hin t imber f rame buildi ngs, Briti sh Gypsum products are extensively used t o f orm t he internal elements. They provide external w all linings, part itions, separating and compartment walls, ceiling linings, compartment floors, cavit y barri ers, and ceilings below roof spaces. Linings range from basic Gyproc Wallboard w here economical space division is required, t hrough to specialist boards such as Gyproc Wallboard Duplex, M oisture Resistant Board, Plank,

7

Duraline, SoundBloc, Fireline, a nd Glasroc M ulti -Board, chosen to achieve specified perf ormance requirement s.

BSEN ISO 9002, and m aint ains the q uali t y and leadi ng ed ge perf orman ce of it s pro ducts and systems thr ough an extensive and on–going p rogr amme of research, development , and t esti ng. This is suppo rt ed by in–house f ire,

The lightw eight nat ure of plasterboard and its speed of installation are ideally suited t o timber f rame building met hods. This, coupled w ith complet ely dry construction techniques and t he high standards of f inishing t hat are possible, m ean t hat Brit ish Gypsum prod ucts provide extremely cost-effective internal lining solutions. Brit ish Gypsum lining s/ element s conf orm t o : BS 1230: Part 1: 1985 Specification for plasterboard excluding materi als submitt ed t o secondary operat ions. BBA Certif icate No. 90/ 2541: Glasroc Mult i-Board. BS 5234: Part s 1 & 2: 1993 Code of Practice: Int ernal non-loadbearing partit ions.

6

8

Manual Handling Guidance on Regulations ISBN 0 11 886335 5. Managing Construction for Health and Safety ACOP ISBN 0 7 7176 0792 5. A Guide to Managing Health and Safety in Construction ISBN 0 7176 0755 0. Designing for Health and Safety in Construction ISBN 0 7176 0807 7. The Cont rol of Substances Hazardous to Health in the Con st ru ctio n Ind ustry ISBN 0 11 885526 3.

Quality British Gypsum Brit ish Gypsum o perat es qu alit y assur ance procedur es t o

acoustic, and system test f acilit ies wh ich are uniq ue among buil ding m anuf act urers, and match th e best available anywhere in t he U.K. Timber & Brick The Timber & Brick Quality M ark is a Qualit y Management and Produ ct Con f or mit y Scheme, whi ch est abli shes a benchmark of go od practice fo r designers and manuf actu rers of t imber f ramed bui ldin gs. It is based upon t he system requi rement s of ISO 9000, and th e technical requ irement s of Building Regulat ions to geth er wit h relevant British, Europ ean and Warrant ors' St andards. There are tw o part s to th e scheme covering b ot h design and manuf act ure.

Limitations British Gypsum standard plaster board lini ngs are not generally suit able f or u se in areas subject t o cont inuo usly damp or humi d condit ions. In such application s th e designer shoul d consider th e use of specialist boards or tr eatment s. For f ur t her d etai ls cont act Brit ish Gypsum Techn ical Service Department on 0990 456123. Seasoned t imber w it h a moistu re cont ent no t exceeding t hat recomm ended in BS5268: Part 2: 1991 and BS4978: 1988 should b e used thr oughout . Handling and stor age Brit ish Gypsum f ull y accepts its respon sibi lit ies as a supp lier of buil ding mater ials and systems as requir ed by Secti on 6 o f th e Health and Safet y at Wor k Act 1974. However, in d esigni ng and i nstall ing syst ems incorpor atin g Brit ish Gypsum pro ducts, ful l consideration must be taken of the requirements of th e following : 1 2 3

4

Manual Handling Operations Regulations 1992. Constru ction (Design and Management) Regulations 1994. Cont rol of Substances Hazardous to Health Regulations 1988 (COSHH).

Specifiers can now procure t imber f ramed bui ldin gs safe in the knowledge t hat t he companies they are approaching have all been t hrough a rigorous third part y certif ication pro cess befo re being awar ded th eir Certi fi cate of Registr atio n. In additi on t hey are assured t hat on –going surveillance is taki ng pl ace to make sure t hat t he high st andards establ ished at t he init ial registrat ion stage are being maint ained. The benefi ts of th e Timber & Brick Qualit y Mark are only available from timber frame design and manufactur er members of Timber & Brick. A ful l list of members is available fr om The Timber & Brick Infor mati on Council on 01923 778136


Gyproc and Glasroc boards – descripti on

Components

Wallboard / Wallboard Duple x Standard board pr oduct suitable f or direct decoration o r gypsum plaster f inish.

Gyproc and Gla sroc boards – data Table 1

Dime nsions

Type of board

Thickness mm

Width mm

..................................................................................... Wallboard, Wallboard Duplex

9.5, 12.5, 15

900, 1200

Plank

19

600

M oist ure Resist ant Board

9.5, 12.5, 15

1200

Duraline

12.5

1200

SoundBloc

12.5, 15

1200

Fireline

12.5, 15

900, 1200

Fireline Duplex

12.5

1200

M ult i-Board

6, 10, 12.5

1200

Baseboard / Baseboard Duplex

9.5

900

Lat h

9.5, 12.5

400

..................................................................................... Gyproc Nails - 30, 40, 50, and 65mm, fixing boar ds to f ramin g. Gyproc Dryw all Screw s - 32, 36, 42, 50, and 60mm , fi xing boards to fr aming as an alternative to n ail-fixing. Isowool General Purpose Roll (1000) or Isowool Acoustic Partition Roll (1200) - providin g acousti c and t hermal insulation in p artit ions, walls, roof s, and f loors. Isowool Timber Frame Batt s (1005) - providing thermal and acoust ic insulat ion i n extern al wall s. Isowool Sound Deadeni ng Floor Slabs (6405) - providing

Wallboard Duplex is backed wi th a vapour control membr ane for use where a vapour contr ol layer is specified. Plank 19mm thick version o f Wallboard wh ich pro vides addit ional mass

M oisture Resistant Board Silicone tr eated core and w ater repellent green paper li ner. Suit able as a base fo r ceramic tilin g in w et–use areas, and f or ext ernal sof f it s in sheltered positions. Duraline Mod ified higher mass core w ith a heavy dut y mustard colour ed lin er. Provides a high im pact resistance wall and partit ion lining.

SoundBloc High density core w it h a pale blue liner. Suit able fo r w all linin gs and part it ions wh ere greater levels of sound in sulat ion are requir ed.

sound d eadening in t imber-base interm ediate separatin g floors. Isowool Flanged Rolls (1012) and (1022) - paper-f aced and alumin ium-f aced p rodu cts respecti vely f or specialist

Fireline / Fireline D uplex Pink colou red li ner. Glass fi bre and ot her addi ti ves in th e core t o provide increased fir e prot ectio n.

applications. Isowool Sleeved Cavity Fire Barrier - fire stopp ing. Gyproc Resilien t Bar - for parti ally isolating t he lining fro m the f raming fo r improved sound insulation. Gyproc Sealant (opt ional) - sealing airpat hs. Gyproc jointing mat erials - f or a seamless fi nish, including: Joint Tape - perf orated paper tape for joint reinforcement. Fibatape - self -adhesive glass f ibr e mesh t ape. Joint Filler - tape bedding and filling joint s. Easi-Fill - tape bedding, bulk filli ng, and finishing. Joint Cement - joint fi nishing (hand o r mechanical). Glasroc Fill er - bulk fill ing j oint s in Glasroc Mult i-Board. Dryw all Primer - priming the lin ing surf ace ready for decoration. Dryw all Sealer - primin g and sealing t he linin g surf ace to pr ovide vapour contr ol.

Firelin e Duplex is backed w it h a vapour contr ol membr ane for use where a vapour contr ol layer is specified. Glasroc M ult i–Board Non–combu sti ble g lass reinf orced gypsum board. Combi nes excellent f ire pro tectio n prop ert ies and high impact r esist ance. Ideal for curved linin gs. Baseboard / Baseboard Duplex Grey f aced board suit able for l inin g ti mber joi sts, st uds, and bat t ens as a base fo r gyp sum p last ers. Baseboard Dup lex is backed wit h a vapour cont rol membrane for use where a vapour control l ayer is specified. Lath Grey faced ceiling board suit able f or g ypsum p laster application.

Thistle M ult i-Finish or Thistl e Board Finish - providing a plaster fi nish t o t he decorati ve face asan alternative t o j oint ing. 5


Applications

Internal partit ions and walls Timber stu d part it ions and wall s are used in bot h new-bu ild and general ref urbi shment . Timber stud separatin g and compartm ent wall s are pri marily specif ied as sound resisti ng wall s in r esident ial un it s such as fl ats and apartm ents to meet the sound i nsulation requirements of national Building Regulat ions. The partit ions and walls are constr ucted f rom t imber sections nail-fixed t o pro vide a suit able singl e stu d or t wi n st ud f ramew ork. Gyproc or Glasroc boards are nail or screw -fixed t o each side to f orm t he linin g. Isow ool in sulat ion wi ll impr ove sound in sulat ion if included in th e stu d cavity. Refer t o Tables 2 and 3. External w alls Gyproc plasterboards are used as the in t ernal l ini ng t o struct ural t imber f rame wall s. The external w all is based on a str uctural tim ber fr ame comprising f actor y-produced tim ber unit s to wh ich sheathi ng board and a br eather membr ane is att ached. The frame is tied to the external brick leaf using f lexible wall t ies. Alt ernati ve claddin gs, such as ti le hangin g and t imber cladding, are fi xed directl y to the t imber f rame. Isow ool glass mineral w ool in sulat ion is included i n t he stu d cavity, and Gyproc plasterb oard f orms the int ernal lining . Refer t o Table 4. Floors and ceilings Gyproc plasterb oards are fixed to t imber jo ists to fo rm ceiling linings in bot h new -build and g eneral ref urbishment. They comprise one or t wo layers of board w hich are nail or screw -fixed t o t he ti mber jo ist support s. Isow ool g lass mineral woo l insulation w ill improve the t hermal and sound insulat ion. Compart ment f loor s are primaril y specif ied as sound resisti ng f loor s in r esident ial un it s such as f lats and apartments to meet the sound insulation requirements of nati onal Buildi ng Regulat ions. They combi ne a plasterb oard ceiling linin g, Isowoo l insulation in t he flo or cavity, and a platf orm or Gyproc SI Floor to give the requir ed airborne and impact sound perf ormance. Refer t o Tables 5 and 6. Roofs Gyproc plasterb oard i s used t o li ne t he und erside of tr aditional or tr ussed roof raft ers to provide a ceiling membrane w it h Isow ool gl ass mineral w ool insulation l aid over the membrane t o pro vide sound / t hermal insulation. Gypr oc Gyplyn er o r Gypro c MF Suspended Ceilin g can be u sed wh ere a reduced height ceilin g is requi red. Refer t o Table 7. Cavity barriers Nation al Building Regulat ions require t hat concealed spaces in t he str uctur e or f abric of a building are sub-divided or sealed by means of cavity barr iers or f ire sto ppin g. Suit able cavity b arriers can be fo rmed using Gyproc Firelin e or Glasroc Mu lt i-Board of approp riat e th ickness. Isow ool Sleeved Cavity Fire Barrier can provide f ire sto ppin g. Refer t o Table 8.

6

Typical interiors


Energy efficient private housing Communit y housing for t he elderly

Period style pri vate housing

Private f lats development

Stone-f aced environmental ly conscious development 7


Performance

Fire prote ctio n Plaster board i s designat ed a 'materi al of l imit ed combusti bili ty' w it hin t he Buildi ng Regulat ions 1991. The plaster boar d surf aces achieve a Class 0 rat ing as a result of th eir per fo rmance when tested t o BS 476: Part s 6 and 7. Glasroc Mult i-Board is non-combustibl e when t ested t o BS476: Part 4: 1970. Fire resistance The fi re resist ances given in Tables 2 - 8 are for imperforate const ru ctio ns test ed t o BS 476: Part 8: 1972, or BS476: Part 22: 1987, or are assessmen t s based on t hese tests. Sound insulati on The Rw rat ings given in Tables 2 – 8 are for imperforate constr uction s and have been calculat ed in accordance wit h BS5821: Part 1: 1984, usin g measur ement s f ro m labo rat or y t est s t o BS 2750: Part 3 : 1980, or esti mat es w here d irect t est data is not available. Airt ight ness is essenti al fo r opt imum sound insulation . While most junctio ns wi ll be sealed by stand ard join ti ng mat erials, gaps at t he base of t he partit ion or lin ing, at t he perimeter of th e flo or / ceiling, and ot her small airp aths, can be sealed using Gypro c Sealant . The laborat ory sound insulat ion dat a quot ed was measured in th e absence of fl anking tr ansmission. The actu al perf ormance of the buildi ng element will generally be governed by fl anking tr ansmission. Water vapour control Where t here is a requirement fo r a vapour cont rol l ayer, Duplex gr ade board s shoul d be specified as the f ace layer (i.e. th e outer layer in doub le layer lini ngs). The application of tw o coats of Gyproc Drywall Sealer to t he face lini ng w ill also provide vapour contr ol. Thermal propert ies Isow ool g lass mineral w ool i nsulat ion i s posit ioned b etw een joists or wall stud s to provide the r equired level of thermal insulation . The U values given in Table 4 for external wall constr uction s are based on a non -combu sti ble g lass mineral wo ol qui lt being pr ovided in t he st ud cavity. The use of 90mm Isow ool Timber Frame Batt s 1005 in conjun ct ion w it h a stand ard 89mm stu d fr amewor k can provide a U value down to 0.38W/m 2K. The use of 140mm studs wit h t he same th ickness of Isow ool 1005 can pro vide a U value dow n t o 0.27W/m 2K.

Roof designs

8


Performance Table 2 Timber stud partitions and w alls w ith Gyproc linings

1

2

One layer of board each side of t imber st uds at 600mm cent res.

3

One layer of board each side of t imber st uds at 600mm cent res wit h one layer f ixed t o Gyproc Resilient Bars t o one side plus 25mm Isow ool 1200 in t he cavit y.

4

Tw o layers of board each side of t imber st uds at 600mm cent res.

Remedial t reat ment on one side of exist ing plast erboard part it ion using 50 x 50mm t imber bat t ens at 400mm cent res w it h 50mm Isow ool 1200 bet w een Gyproc Resilient Bar fixed hori zont ally and tw o layers of bo ard.

............................................................................................................................................................................... Detail

Board type

Board thickness

Nominal partition thickness

Approx. w eight

Fire resistance

mm

mm

kg/m2

hours

Laboratory sound insulation 100 — 3150Hz No insulation 25mm Isowool 1200 ø Rw dB Rw dB

Performance substantiation report

............................................................................................................................................................................... 1

Mult i–Board

6

87

15

½

34

–

1

Wallboard

12.5

100

19

½

35

36

1

Duraline

12.5

100

28

½

36

–

1

Wallboard

15

105

23

½

37

40

A026002 / 006

2

SoundBloc

12.5

116

24

½

37

41

A046013 / 021

1

SoundBloc

12.5

100

23

½

38

40

A026011 / 016

2

Wallboard

12.5

116

20

½

–

42

A046009 / 017

1

SoundBloc

15

105

27

½

40

43

A026014 / 017

G106001 A026001 / 005 Q026021

........................................................................................ 1

Fireline

15

130

30

1¶

38

–

3

Wallboard

12.5

125

36

1

38

42

A026003 / 007

3

SoundBloc

12.5

125

44

1

44

46

A026015 / 018

4

SoundBloc

15

196

48

1

–

52 §

A026023

A05402

........................................................................................ 3

Fireline

15

160

54

2¶

41

–

A026025

............................................................................................................................................................................... Notes to Table 2 The fire resistance and sound insulation performances are for part itions and w alls incorporating tapered edge boards wit h all joints taped and filled according to British Gypsum’s recommendations. The quoted performances are achieved only if British Gypsum components are used throughout , and the Company's fixing recommendations are strictly observed. Any variat ions in the specifications should be checked w ith British Gypsum. All tests were carried out w ith boards nailed-fixed. Screw -fixing i s an acceptable alt ernative - refer t o board fixing on site, Table 12. M inimum dimensions of t imber studs 75 x 38mm unless otherwise stated. Larger stud sizes w ill enhance performance. ¶ Loadbearing part itions at 100% load rat io, w ith mini mum dimensions of t imber studs nominal thi ckness 100 x 50mm. § 50mm Isowool 1200. ø An equivalent sound insulation improvement can be achieved using 60mm Isowool 1000.

9


Table 3 Timber stud separating and compartm ent w alls w ith Gyproc linings

Separat ing / com part m ent w alls 100% load ratio

1

Com part m ent w alls

2

Tw o sep ar at e t i mb er f r am es sp aced 50m m ap ar t , co nsi st i n g o f 89 x 38m m t im ber st ud s at 600mm centres with mid–height noggings. Two layers of board each si de. M in . 25m m Iso w oo l 1200 bet w een t he st uds on one side.

3

Tw o sep ar at e t i mb er f r am es co nsi st i n g o f 89 x 3 8m m t i m ber st ud s at 600m m cen tr es w it h mid–height noggings. Two layers of board each side. Min. 80mm Iso w oo l 1000 bet w een t he st u ds on one side.

5

4

Tw o l ayer s o f b oar d each si de o f 75 x 38m m t i mb er st u ds at 600m m cen tr es w it h Gyp ro c Resilient Bars fixed horizontally to one side at 600mm centres. M i n. 50m m Iso wo ol 1200 in t he cavit y.

Tw o l ayer s o f b oar d each si de o f 75 x 38m m t i mb er st u ds at 600m m cen tr es w it h Gyp ro c Resilient Barsfixed horizontally to both sides at 600mm centres. M i n. 50m m Iso w oo l 1200 in t h e cavit y.

Separating / compartment w all in roof spaces

Min imum 37mm timber roof tru sses wit h additi onal framin g to back board joints. One or t wo layers of board each side. Isowoo l insulation installed if requir ed.

............................................................................................................................................................................... Detail

Board type

Board thickness

Approx. w eight

Fire resistance

mm

Nominal partition thickness mm

kg/ m2

hours

Laboratory sound insulation 100 — 3150Hz


Rw dB

............................................................................................................................................................................... 5

Duraline

12.5

225 (min)

30

1

38

Q026024

5

Wallboard

25 (2 x 12.5)

250 (min)

40

1

38

A046025

3

SoundBloc

25 (2 x 12.5)

141

46

1

56

A046005

4

SoundBloc

25 (2 x 12.5)

157

47

1

59

A046006

2

SoundBloc

30 (2 x 15)

263 (min)

55

1

61

A036002 ¶

1

Wallboard / Plank

12.5 + 19

263 (min)

54

1

63

A046022 ¶

1

SoundBloc / Plank

12.5 + 19

263 (min)

58

1

64

A036001 ¶

3

SoundBloc

30 (2 x 15)

151

54

1½

58

A046007

3

SoundBloc / Plank

12.5 + 19

154

57

1½

58

A046023

4

SoundBloc

30 (2 x 15)

167

55

1½

60

A046008

4

SoundBloc / Plank

12.5 + 19

170

58

1½

60

A046024

........................................................................................

............................................................................................................................................................................... Notes to Table 3 The fire resistance and sound insulation performances are for w alls incorporating tapered edge boards with all joint s taped and fille d according to British Gypsum’s recommendations. The quoted performances are achieved only if British Gypsum components are used throughout, and the Company's fixing recommendations are strictly observed. Any variations in the specifications should be checked with British Gypsum. All tests were carried out w ith boards nailed-fixed. Screw-f ixing is an acceptable alternat ive - refer to board f ixing on site, Table 12. Detail 5 provides the 1 hour fire resistance betw een compartment s as required by Building Regulations, subject to the suitability of t he surrounding structure. The combination of ceiling and truss cladding is essential to meet the acoustic requirements of Building Regulations (see construction det ail F). Where single layer Gyproc Duraline linings are used how ever, joints must be backed wit h ti mber. Alternatively, a min. 100mm w ide strip of Duraline can be used. The actual fire and sound figures quoted are based on 100 x 35mm t russes at 600mm centres. The terminology f or Separating and Compartment w alls and floors follow s the conventions established in the Approved Documents to the England and Wal es Building Regulat ions. Part B refers to fi re resisting constructions as "Compart ment " walls, and Part E to sound resisting constructions as "Separating" wal ls. Please note, how ever, that not al l w alls designated as "Compartment " under Part B w ill be required t o perform as "Separating" w alls under Part E, although this is generally t he case. If in doubt ref er to t he relevant Approved Document. ¶ Site sound test data is available on request. Contact British Gypsum Technical Service Department on 0990 456123. 10


Table 4 Timber frame external w alls

1

2

3

265mm

215mm

Cladding of 103mm facing brick ø tied with stainless steel wall ties across a nominal 50mm clear cavity through b r eat h er m em br an e an d sh eat h i ng bo ar d t o mi ni mu m 89 x 38m m t i mb er st u ds at max 600mm cent res. 90mm Isow ool 1005 in st ud cavit y w it h internal linings as below. 100% load ratio.

Cladding ‡ comprising verti cal ti le hanging on treated 25mm battens fixed through breather membrane and sheathing board t o m in i mu m 89 x 38m m t im ber st u d s at m ax 600m m cen t res. 90m m Iso w oo l 1005 in st ud cavit y w it h int ernal linings as below. 100% load rat io.

283mm Cladding of 100mm aggregate block § w it h 20mm render tied with stainless steel wall ties across a nominal 50mm clear cavity through b rea t her m em br an e an d sh eat h in g bo ar d t o mi ni mu m 89 x 38m m t i mb er st u ds at max 600mm cent res. 90mm Isow ool 1005 in st ud cavit y w it h internal linings as below. 100% load ratio.

............................................................................................................................................................................... Detail

Board Type

Fire resistance hours ¶

U value W/ m2K

Estimated laboratory sound insulation 100 — 3150Hz, Rw dB


............................................................................................................................................................................... 1

One layer of 12.5mm Gyproc Wallboard Duplex

½

0.39

50 – 55

A066001

2


½

0.41

50 – 55

A066002

3


½

0.44

40 – 45

A066003

........................................................................................ 1

Inner layer of 12.5mm Gyproc Wallboard and

1

0.38

50 – 55

A066007

1

0.40

50 – 55

A066008

1

0.43

40 – 45

A066009

out er layer of 12.5mm Gyproc Wallboard Duplex 2

Inner layer of 12.5mm Gyproc Wallboard and out er layer of 12.5mm Gyproc Wallboard Duplex

3

Inner layer of 12.5mm Gyproc Wallboard and out er layer of 12.5mm Gyproc Wallboard Duplex

............................................................................................................................................................................... Notes to Table 4 The fire resistances quoted are f or loadbearing w alls tested w ith f ire exposure to t he inter nal face. Performances are for w alls incorporating tapered edge boards w ith all joint s taped and filled according t o British Gypsum's recommendations. The quoted performances are achieved only if British Gypsum components are used t hroughout, and t he Company's fixing recommendations are strictly observed. Any variations in the specificat ions should be checked w ith British Gypsum. All tests were carried out w ith boards nailed-fixed. Screw -fixing i s an acceptable alt ernative - refer t o board fixing on site, Table 12. Where higher standards of thermal insulation a re required the use of 140mm studs wit h an equivalent thickness of Isow ool 1005 w ill produce lower U values. Contact British Gypsum Technical Service Department on 0990 456123 for guidance. U values are calculated by the proportional area method. The proportion of timber to mineral wool used in the calculations is 15% timber to 85% mineral w ool. This allows for f raming, lint els, cripple studs, et c., and is the figure used by T.R.A.D.A. f or over 10 years. The Thermal Conductivity ( l )value used of 0.12W / mK for t imber is based on t hat appli cable to the Spruce / Pine / Fir groups from N. America and Europe used in timber frame structures. If standard wallboard is used in place of Duplex, a min. 500 gauge polyethylene film vapour control layer will be required directly behind the plasterboard, fixed to the face of the t imber frame. ¶ The fire resistance performances quoted are independent of any contribution f rom the ext ernal construction. § Conductivit y ( λ ) of block taken as 0.51 W/mK (1400 kg/m 3) ø Conductivity ( λ ) of brick taken as 0.84 W/mK ‡ Other lightw eight claddings, such as timber sidings, cementitious render or lat h, et c., can be used and w ill off er t he same performance.

11


Table 5 Timb er joist floors wit h Gyproc ceiling linings

1

Standard ti mber floor wit h no insulation

2

3

4

Min imum 30mm Gyproc Alpha Floor Screed on 1000 gaug e pol yth ene sheet (taped at joi nt s) laid on Expamet wi re reinf orced mesh w ith Gyproc Edge Str ips to perim eter on any suit able floor d eck.

Gyproc Gyplyner Ceili ng framework to joists.

Gyproc Resilient Bars at 450mm centres to underside of joists.

............................................................................................................................................................................... Detail

Board type

Flooring board type

Joist centres

Joist w idth (min.)

Fire resistance

mm

mm

hours

Estimated laboratory sound insulation § 100 — 3150Hz Airborne Impact Rw dB Lnw dB


............................................................................................................................................................................... 1

One layer of 12.5mm Gyproc Wallboard

aø

600

38

½ (modif ied) ø 38

79

C016001

2


a

600

38

½ (modif ied) ø 42

71

V106007

1


c

450 ¶

38

½

37

82

C014003

1

One layer of 15mm Gyproc Wallboard

a

600 ¶

38

½

38

79

C016005

1

Tw o layers of 15mm Gyproc Wallboard

c

600 ¶

47

1

40

76

C016006

1

Inner layer of 12.5mm Gyproc Fireline and out er layer of 15mm Gyproc Fireline

a

600

38

1

40

76

C016008

1

Tw o layers of 12.5mm Gyproc Fireline

b

600

38

1

40

76

C016009

2

Inner layer of Gyproc Plank and out er layer of 12.5mm Gyproc Wallboard

a

600

38

1

45

69

V106008

4


a

600

38

1

50

68

C206003

3


a

600

38

1

52

66

C206004

........................................................................................

........................................................................................

........................................................................................ 1

Tw o layers of 15mm Gyproc Fireline

b

450 ¶

47

1½

40

78

C014011

............................................................................................................................................................................... Notes to Table 5 The fire resistance and sound insulation performances are for ceilings incorporating tapered edge boards with all joint s taped and fille d according to British Gypsum's recommendations. The quoted performances are achieved only if British Gypsum components are used throughout , and the Company's fixing recommendations are strictly observed. Any variat ions in the specifications should be checked w ith British Gypsum. All tests were carried out w ith boards nail–fixed. Screw-f ixing is an acceptable alternat ive - refer to Board fixing on site, Table 12. Where joist w idth i s less than that stat ed, nominal 50 x 25mm timber batt ens should be screw –fixed to the side of t hose joists w here the ceiling boards butt in order to maintain an adequate bearing surface. Floor types a Any st ruct urall y sui table w ood board f looring. b Wood board t & g flooring, not less than 15mm (finished) thickness. c Wood board t & g flooring, not less than 21mm (finished) thickness. ¶ No noggings. § The acoustic ratings quoted above are based on 200mm deep joi sts and a w alking surface of min. 9.6kg/ m3 . ø 15 : 15 : 30 in accordance with Approved Document. If floor type c is used the fire resistance increases to a full ½ hour.

12


Table 6 Compartm ent / separating floors

2

3

Plat f orm f loor. Gyproc Gyplyner or Gyproc M F Suspended Ceiling ¶ hung u nd er neat h t im ber j oi st s t o g ive a 277m m cavi ty, with 80mm Isowool 1000 between joists.

Gyproc SI Floor w it h Gyproc Plank on SIF Channels. 100m m Iso wo ol 1000 i n cavi ty. Gyproc Resilient Bars at 450mm centres.

5

6

Separating sub–joist floor comprising plat form f loor. 100m m Iso w oo l 1000 i n cavi t y

Minimum 30mm Alpha Gyproc Floor Screed on 1000 gauge polyt hene sheet (t aped at joint s) l ai d o n Exp am et w ir e r ei nf o rced m esh wi t h Gyproc Edge Str ips to peri met er on any suit able fl oor deck. 100mm Isowo ol 1000 in cavity Gyproc Gyplyner Ceiling fr amework to joists.

1

Plat f orm f loor. 100mm Isow ool 1000 b et w een t he j oi st s.

4

Gyproc SI Floor with Gyproc Plank on SIF Channels. 100mm Isow ool 1000 in cavit y. Gyp ro c Gyp lyn er Cei li ng f r am ew or k t o j oi st s.

............................................................................................................................................................................... Detail

Board type

Flooring board type

Joist centres mm

Joist w idth (min.) mm

Fire resistance hours

Laboratory sound insulation 100 — 3150Hz Airborne Impact Rw dB Lnw dB


............................................................................................................................................................................... 6

One layer of 15mm Gyproc Fireline ‡

a

600

47

1

60

56

V106005

3

Tw o layers of 12.5mm Gyproc SoundBloc

b

450

44

1

61

56

C204006

1

Gyproc Plank w it h out er layer of 12.5mm Gyproc Soun dBloc

c

600

44

1

62

56

C016038 §

3

One layer of Gyproc Plank and one layer of 12.5mm Gyproc SoundBloc

b

450

44

1

63

55

C204001 §

4

One layer of Gyproc Plank and one layer of 12.5mm Gyproc SoundBloc

b

450

44

1

63

55

C154008

2

Tw o layers of 12.5mm Gyproc SoundBloc

c

600

44

1

66

50

C106011

5

Tw o layers of 15mm Gyproc SoundBloc

c

600

47

1

66 ø

48

C106050

3

Tw o layers of 15mm Gyproc Fireline

b

450

44

1½

60

57

C204002

........................................................................................

............................................................................................................................................................................... Notes to Table 6 The fire resistance and sound insulation performances are for ceilings incorporating tapered edge boards with all joint s taped and filled according to British Gypsum's recommendations. The quoted performances are achieved only if British Gypsum components are used throughout, and t he Company's fixing recommendations are strictly observed. Any variations in the specifications should be checked w ith British Gypsum. All tests were carried out w ith boards nailed-fixed. Screw -fixing i s an acceptable alt ernative - refer t o board fixing on site, Table 12. Where joist w idth is less than t hat stat ed, nominal 50 x 25mm timber batt ens should be screw–fixed to t he side of those joists w here the ceiling boards butt in order to maintain an adequate bearing surface. The terminology f or Separating and Compartment w alls and floors follow s the conventions established in the Approved Documents to the England and Wales Building Regulations. Part B refers to fire resisting constructions as "Compartment" walls, and Part E to sound resisting construction as "Separating" w alls. Please note, how ever, that not all w alls designated as "Compartment " under Part B will be required to perform as "Separating" wal ls under Part E, although t his is generally t he case. If i n doubt ref er to the relevant Approved Document. Floor types a Any structurally suitable wood board flooring. b Soft w ood floor boarding, not less than 21mm (finished) thickness. c Walking surface of 18mm t & g w ood board flooring, spot–bonded w ith Gyproc Sealant at 300mm centres to a substrat e of Gyproc Plank laid on 25mm Isowool 6405 (64kg/ m3) laid on mini mum 12mm w ood based sheet sub-deck nailed t o the joists. § Site sound insulation f igures are available on request. ø Under–estimat e of airborne sound insulation performance due to laboratory constraints. ¶ Normal f ixing centres for M F5s and M F7s (450 and 1200mm respectively). ‡ The example shown , using a combination of Gyproc Alpha Floor Screed and timber floor construction, has been t he subject of acoustic testing and fire resistance assessment. Before specifying this construction, advice should be sought from a suitably qualified timber or structural engineer to determine the appropriat e size, span, and spacing of joists able to w ithstand all imposed loads, including that of the f loor screed. At 30 mm thi ckness, Gyproc Alpha Floor Screed has a mass of up t o 63kg/ m 2. The 30N/mm2 grade of Gyproc Alpha Floor Screed has a flexural strength of at least 6N/mm2. 13


Table 7 Ceilings below roof spaces

1

2

4

3

Ti mb er j o ist s o r bo t t o m ch or d of t r u sses w i t h su it ab l e t i mb er n o gg i ng s b et w een j oi st s t o support board edges. Insulat ion laid bet w een joist s.

Gyp ro c Gyp l yn er o r M F Su sp en ded Ceiling hung f rom joist s. Insulati on laid over grid.

............................................................................................................................................................................... Detail

Board type

Joist / truss centres mm

M in. joist / truss width § mm

Insulation type

Insulation thickness mm

Fire resistance hours


............................................................................................................................................................................... 1

One layer 12.5mm Glasroc M ult i–Board

600

38

Isow ool 1000

150

½

G106041

2

Tw o layers 12.5mm Gyproc Wallboard

600

50

Isow ool 1000

150

½

C106049

1

One layer 12.5mm Gyproc Fireline

600

38

Isow ool 1000

150

½

C106047

4

Tw o layers 12.5mm Gyproc Wallboard

600

35

Isow ool 1000

150

½

C106045

........................................................................................ 2

Tw o layers 10mm Glasroc M ult i–Board

600

35

Isow ool 1000

150

1

G106042

3

Tw o layers 12.5mm Gyproc Fireline

600

38

Rock mineral woo l (24kg/m 3)

150

1

C106048

4

Tw o layers 12.5mm Gyproc Fireline

600

35

Rock mineral woo l (45kg/m 3)

30

1

C106046

............................................................................................................................................................................... Notes to Table 7 The fire resistance performances are for imperforat e ceilings incorporating tapered edge boards wit h all joint s taped and f illed according to British Gypsum's recommendations. The quot ed perf ormances are achieved only if British Gypsum components are used throughout , and the Company's fixing recommendations are strictly observed. Any variations in the specifications should be checked with British Gypsum. All tests were carried out w ith boards nail–fixed. Screw-f ixing is an acceptable a lternat ive - refer to Board fixing on site, Table 12. § Where t imber bearing w idth is 35mm or less than t he minimum stated, nominal 50 x 25mm t imber batt ens should be fixed to t he side of timber supports where the ceiling boards butt in order to maintain an adequate bearing surface (refer to Board fixing on site, Fig 1). Table 8 Cavity barriers

Detail

Construction

Fire resistance Integrity : Insulation minutes


............................................................................................................................................................................... 10mm Glasroc Mult i–Board f ixed t o one side of a t imber st ud f ramew ork or t russes at maximu m 600mm cent res using Gyproc Nails or Screws at 230mm cent res. Fire–sto ppi ng t o t he peri met er as necessary.

30

15

G110002

As above but w it h 12.5mm Gyproc Fireline

30

15

E106002

Isowool Sleeved Cavity Fire Barrier sealing the cavity between the outer brick wall

30

30 ¶

E106004

and the int ernal t imber frame leaf.

............................................................................................................................................................................... Notes to Table 8 The fire resistances are for barrier s wit h all joints taped and f illed according to British Gypsum's recommendations. The quoted perf ormances are achieved only if British Gypsum components are used t hroughout, and t he Company's fixing recommendations are strictly observed. Any variations in the specifications should be checked with British Gypsum. ¶ Joints betw een sleeved cavity barriers must be compressed in accordance w ith Isow ool recommendations in order t o achieve 30 minutes insulation. 14


Specification clauses For det ails of Specif icati on Clauses cont act Brit ish Gypsum Technical Service Depart ment on 0990 456123.

Design When designi ng t imber f rame build ings, th e designer should take account of relevant British Stand ards, Documents, and associated lit eratur e. General gui dance can be ob tain ed by contacting t he Timber and Brick Info rmat ion Council on 01923 778136. For f ur t her gu idan ce on Brit ish Gypsum pro ducts and systems, refer t o The Whit e Book, o r cont act Brit ish Gypsum Technical Service Depart ment on 0990 456123.

appl icati ons such as plasteri ng and screedi ng are subject t o slow d rying condit ions. In small f lat–roof areas, where a polythene vapour cont rol layer is included in th e ceiling constr uction , condensati on can fo rm on th e polyt hene surf ace. This can result in pl aster board becoming u nduly damp, and affecting t he standard of acceptabilit y of the li ning, and any applied plaster or textured coating. Sound insulati on In designing f or sound insulation it is import ant t o set t argets wh ich are correct in term s of t he uses of spaces separated by parti tio ns and w alls. The table b elow can be used f or gu idance. Table 9

General considerat ions • Ensure that fixing r ecommendations are foll owed f or t he specific board t o be inst alled – ref er to curr ent Brit ish Gypsum li terat ure. • Consider using Gyproc Drywall Screws to eli minat e t he ri sk of nail popping. • Consider using Gyproc Duplex gr ade board wh ere th ere is a need for vapour contr ol. • Sit e condi ti ons must be suit able for t he install atio n of plaster board, e.g. bui ldin g sealed against th e elements, wet trades finished (floor screeds etc.). • Timber must be align ed and levelled, and shoul d satisfy th e requ ir ement s of BS5268: Part 2: 1991. • When text ured coatings are specified th e manufacturer' s recommendat ions must be fol low ed. • Ensure t hat t he flo or constr uction i s suit able to support any impo sed loads, such as th e inclusion of t hermal in sulat ion in th e cavity. • If ceilin g heatin g is specif ied fo r use wit h plasterb oard, th e manuf actu rer's recommendatio ns must be fol low ed. • Ensure t hat cavity barri ers are install ed wh ere requir ed in ord er to satisfy nation al Build ing Regulat ions, part icularly in perimet er wall s in ro of spaces and at r oof / separati ng w all junctions. Racking resist ance Plast erboard p rodu ct s contri but e to t he racking resistance of t imb er f rames in accor dance wi t h BS5268: Sectio n 6.1: 1988 Stren gth and robustness The di mensions and assembly of ti mber suppo rt s shoul d b e suff icient t o allow positive fixing of boards wit hout bounce or und ue deflectio n because of nailin g, screw ing, or ot her applied fo rce. When t he above fixing condition s cannot be met, a ti mber bat ten should be securely fi xed to t he side of th e timb er suppo rt t o increase the bearing surf ace. Where bo ards are fi xed at maximu m centres in adverse condit ions, th e stand ard of lini ng can be aff ected. Adverse condit ions can generall y be described as condit ions wher e high humidit y occurs, principally in t he cold, damp aut umn / wi nt er period. They also refer t o build ings under constr uction during t his period wh ere both t he stru ctur e and w et

Degree of acoustic privacy

Rw

Speech level

25 dB

Normal speech can be easily overheard

30 dB

Loud speech can be heard clearly

35 dB

Loud speech can be distinguished under normal

.....................................................................................

conditions 40 dB

Loud speech can be heard but not distinguished

45 dB

Loud speech can be heard faintly but not distinguished

> 50 dB

Loud speech or shouting can only be heard with great difficulty

..................................................................................... Service penetrations Suit able detaili ng w ill be requi red at service penetr atio ns if specified l evels of f ire r esistance and sound in sulat ion are t o be achieved. Refer to constr uction detail s F and M , wh ich have been show n by test s to m aint ain int egrit y. Room i n a roof Where Gyproc plaster board i s used to line a roo m in a ro of fo r t he pur poses of fi re resistance, a surf ace slopi ng m ore th an 70º fr om vert ical is treat ed as a ceiling , and less th an 70º fro m vertical as a wall lin ing. Timber nogging s Perimet er suppo rt , using eit her min. 38 x 38mm tim ber nogg ings or plasterb oard clips, may be requir ed betw een ceilin g jo ists to support board edges. The pro vision of nogg ings depends on t he t hickness of board s used, and t he spacing of t imber joists. Timber nogg ings / clips shoul d alw ays be provided at t he room perimeter wit h the exception t hat th ey are not requ ired wh en using 15mm Gyproc Wallboard. Nail popping Loosening of nails in t imber can occur t hrough timb er shri nkage, or as a result of f ixing bo ards t o misalign ed or tw isted f ramin g. To reduce the ri sk, boards shoul d be f ixed tigh t t o fr aming members. Where the risk of nail popping is unacceptabl e, consideration shoul d be given t o f ixing using Gyproc Dryw all Screws. For f urt her advice contact British Gypsum Technical Service depar t ment on 0990 456123. 15


Partit ion junctions

shou ld b e specif ied as the li nin g. For small ar eas such as

Where part it ion ju nction s occur, addit ional stu ds can be

splashbacks, how ever, st andar d w allb oar d can be used,

specif ied wi th in t he factor y–pro duced wall panels, and can be

provided t hat t he surf ace is prot ected by applying t wo coats

incorporated either dur ing manuf actur e or on–site.

of Gyproc Drywall Sealer pr ior t o t iling.

Alt ernat ively, a suit able ladder f rame can be install ed bet ween verti cal stu ds duri ng sit e const ructio n, wit h

Finishing

hor izont al memb ers at 600mm cent res (see Constr uction

Plasterboards (excluding Mo isture Resistant Board)

detail W for typical example).

Tapered edge boards are used fo r t he vast m ajori ty of dry lini ng w ork . For jo int ing, Gyproc Joint Tape is used to

Services

reinf orce board joint s t o minim ise any risk of cracking .

Electr ical and ot her small service runs can be r out ed w it hin

Gyproc Fibat ape provides an altern ative met hod b ut is not a

the t imber stud / floo r cavity.

direct substit ut e in it s resist ance t o cracking . Tape is bedded, (or i n t he case of Fibat ape , wh ich is self –adhesive, st uck over

The install atio n of elect rical services shoul d be carried o ut to

the j oint ), and the joi nt fill ed, using Gyproc Joint Filler or

BS 7671, follow ing t he recommendations of the Instit utio n of

Gyproc Easi–Fill . Gyproc Join t Cement is used as th e f ini shin g

Electr ical Engi neers. Concealed cables may need eart hed

compo un d. If Gyproc Easi–Fill is used, it can be also be used

metall ic covering, or be enclosed in eart hed conduit ,

for fini shing. Once the joint treatment is set and dr y, the

t runk ing, o r du ct ing t o satisfy BS7671. Cables located w it hin

ent ire plast erboard surface is tr eated wi th o ne coat of Gyproc

thermal insulation may need to b e up–rated t o counter th e

Drywall Primer. This primes th e board ready fo r di rect

eff ect o f o verheating (IEE Regulat ions refer).

decorati on, and allow s wall covering s to be wet –str ipp ed in t he fu tu re. Where vapour control is specif ied, tw o coats of Gyproc

Fixtures

Dryw all Sealer are ap pli ed to pr ime and seal the boar d surf ace.

The selection of the mo st appropriate fixing depends on t he

Drywall Sealer, how ever, shoul d no t be used in conjunctio n

weight of fixt ures to be installed, the part icular Gyproc

wit h vinyl or ot her low permeabilit y wall coverings.

system u sed, and w heth er t he f ixing h as to brid ge a cavity. Table 10 gives general gui dance.

A gypsum plaster fi nish can be specif ied as an alt ernat ive to joint ing and pr imer appli catio n. Thistl e Mult i–Finish or Thistl e

Table 10 Fixtures to plasterboa rd

Board Finish plaster can be appl ied t o t he decorative f ace of the board t o a nominal 2mm thickness after jo int treatment .

Fixture

Example

Solution

Heavy

Lavat ory ci st er ns; wash hand basins; st o r ag e h eat i n g unit s; cen t r al heat i n g boilers.

Framing t o be incorporat ed in partitions. In lining systems t h e f i xi ng t o be mad e b ack t o t he st ruct ure using a propriet ary f i xi ng . Th e ca vi t y m ay need t o b e blocked.

.....................................................................................

Gyproc M oisture Resistant Board Gyproc Mo ist ur e Resistant Board can be used as a cerami c til e backer board, and is available w it h t apered or square edges. This pro duct can only be plastered pro vided t he surf ace is pre–treated w ith a propri etary PVAC bonding agent applied

.....................................................................................

in accord ance wit h t he manuf actu rer' s instr uction s. Gyproc

M ed iu m t o heavyw eight

W al l cu pb oar ds; radiat ors.

M u sh ro om p lu gs, p ro pr iet ar y anchors, cavit y f ixings.

Easi–Fill is recommend ed f or join ti ng.

M ed iu m

Fl oo r cu pb oar ds; light f it tings.

Pr op ri et ar y an ch or s, cavi ty f ixings.

Glasroc M ult i–Board

Pict ures.

St eel pin and hook.

..................................................................................... ..................................................................................... Light w eight

..................................................................................... Note : Detailed recommendations and guidance on suitable propriet ary fixings are given in the British Gypsum White Book, or Technical Information leaflet – 'Fixtures to plasterboard', and in the Timber and Brick Information Council publications 'Living in a Timber and Brick Home', and the Timber and Brick Homes Handbook.

Glasro c M ult i–Board is joi nt ed using Glasro c Fill er as a tap ed or t apeless join ing met hod, or Gyproc Joint Cement w here t he joint is t o be reinf orced wit h Gyproc Joint Tape. Textured finishes If a t extured f inish is to be applied, nail h eads shoul d be spot ted u sing Gyproc join t ing mat erial. Gyproc Drywall Primer shoul d b e appli ed as soon as possible aft er bo ard fixing. Joint treatment and texturing should be carried out in

Ceramic tiling

accordance wit h th e textur e manufacturer' s instr uction s.

Ceramic tiles up to 12.5mm thick wit h a maximum weight of 32kg/m 2 can be appl ied using t hi n–bed adhesives (usually

Ornate / decorative features

3mm t hick). Stu d suppo rt cent res shoul d be closed dow n t o

Other decorat ive produ cts fr om Brit ish Gypsum and

400mm, or alter nati vely, tim ber nog ging s (50 x 38mm) shoul d

Art ex-Blue Haw k in clude Gyproc Cove and Cornice prof iles,

be install ed hori zont ally betw een stu ds at 600mm centr es

Gyproc St ylet ri ms, Ar t ex Ceili ng Roses and A rt ex Dado Panels.

wi th in t he area to be ti led. Gyproc Moisture Resist ant Board

16


Construction – key drawings

perf ormance of in dividu al elements is to be achieved. The termi nolo gy for Separatin g and Compart ment w alls and

The constructio n detail s th at f ollo w are generic and represent

fl oor s f ollo ws th e convent ions est ablished in th e Approved

good practice. Individual practit ioners will have their ow n

Documents to t he England and Wales Building Regulat ions.

pref erred det ails, but t hese shoul d fo llow th e principles set

Part B refers to f ire resisti ng constr uction s as " Compart ment "

out herein.

w alls, and Part E t o soun d resist ing const ruct ion as " Separating" walls. Please not e, however, that not all w alls

Particular attent ion is drawn t o t he junctions betw een

designated as "Compartment " under Part B will b e required

external wall s and separati ng / compart ment f loor s, where

to perform as " Separatin g" walls under Part E, although this

the p rinciples of separation t o avoid f lanking sound

is generally th e case. If in d oubt ref er to t he relevant

tr ansmission mu st be f ollo wed if th e quot ed acousti c

Approved Document.

Key Draw ings - Housing

Cross section

Longitudinal section

Plan

Key Draw ings - Flat s / Comm ercial buildings

Cross section

Longitudinal section

17


Construction – individual details

A

C

B

D

18



E

F

G

H 19



J

L

K

M

20



N

Q

P

R

21



S

U

T

V

22



W

Y

X

Z

23



List of details by reference let ter D et ai l Re fe re nce

Ti tl e

A

Typ ical Eaves d et ai l

B

Ext er nal w al l/g ro un d f l oo r

C

No n l oad b ear i ng p ar t i t i on /u p per f l o or cei li n g

D

No n lo ad bear in g par t it i on /g ro un d f lo or

E

Ext er nal wall to ver ge

F

Compartment (Separating) wall to underside of tiled roof

G

Ext er nal w al l/t i mb er j oi st f l oo r

H

Compartment (Separating) wall junction wit h timber joist f loor. (Small electrical outlet box detail also show n)

J

External wall/Compartment (Separating) floor with t ypical window head

K

Ext er nal w al l w i t h t yp ical w i nd ow ci ll

L

Compartment (Separating) floor junction with Compartment (Separating) wall

M

Compartment (Separating) wall with larger electrical outlet box

N

Non-loadbearing partition on Compartment (Separating) floor

P

Compartment (Separating) floor junction with loadbearing partition under

Q

Compartment (Separating) floor with loadbearing partition under and non loadbearing partition over

R

Compartment (Separating) floor junction with loadbearing partition top and bottom

S

No n lo ad b ear i ng pa rt i t i o n o n t i m be r j o ist f l o or

T

Lo ad bear in g par t it i on /g ro un d f lo or

U

Loadbearing or non-loadbearing partition under timber joist floor

V

Co m par t m en t ( Sep ar at i n g) w al l/g r ou n d f l oo r

W

Compartment (Separating) wall junction with internal partition on plan

X

External wall with internal partition junction and typical door jamb on plan

Y

Compartment (Separating) wall junction with external wall showing typical window jamb on plan

Z

External wall at corner showing typical window jamb on plan.

Note These detail s relate t o bu ildi ngs constructed i n England & Wales. Some minor mod if icati ons wi ll be required t o compl y wi th t he Scott ish and Nort hern Ireland Building Regulat ions.

24



Annotat ion notes to Construction det ails

1.

Brickw ork.

22.

2.

Ext er nal w al l cavi t y.

3.

Stainless steel wall ties.

4.

Br eat h er m em br an e.

5.

Wood based sheathing board.

6.

St r u ct u ral t im ber f ram e.

7.

Vapour control layer (minimum 500 gauge or

40m x 3m metal straps at minimum 1200mm centres located ju st above or below f loor l evel.

23.

Damp proof course.

24.

Damp proof membrane.

25.

Differential movement gap. Minimum gaps to be as in the t able below.

Differential movement gap table

Suspended timber ground floor Other ground floor w hen panels are supported construction on ground floor joists or perimeter joists ...................................................................................................... Allow ances for :

Gyproc Wallboard Duplex). 8.

Gyproc Wallboard 12.5mm thick.

9.

Gyproc Plank (19mm thick).

10.

Gyproc SoundBloc 12.5mm thick.

11.

12.

ground f loor openings

5mm

3mm

Mineral wool insulation minimum 10kg/m (Isowool

f irst f loor openings

12mm

9mm

Timb er Frame Batt s - 1005).

second f loor openings

18mm

15mm

3

25mm glass wool 60 - 100 kg/m 3 (Isow ool Soun d Deadenin g Floo r Slabs 25mm t hick - 6405).

13.

100mm mineral wool minimum 10kg/m 3 (Isowool

Eaves an d ver ges

A dd 3m m t o t he al lo w an ce fo r o pen in gs

on the uppermost f loor ......................................................................................................

General Purpo se Roll - 1000).

26.

Roof space ventilation.

14.

Isow ool Sleeved Cavity Fire Barrier

27.

Maximum 65mm long annular ring shank nails or screws.

15.

Fire stop. (50mm thick wire reinforced rock mineral

28.

Additional layer of Gyproc Wallboard 12.5mm thick

wool). 16.

17.

19.

flats 3 storeys and over).

Wood based sheet walking surface (minimum 18mm thick).

29.

Window frame (typical).

Walking surface spot bonded to Gyproc Plank with

30.

Door frame (typical).

31.

Small electr ical outlet bo x viz. swit ch or 13amp socket.

32.

Larger electrical outlet box for example, cooker point.

33.

Minimum 38mm thick s.w. nogging.

34.

Electricity cable tight fit through hole in nogging.

35.

Proprietary mild steel lintel to support outer leaf of

Gypr oc Sealant at 300m m centr es. 18.

required in buil dings of 1hr fi re resistance (for example

Wood based sheet sub-deck (minimum 12mm thick). Isow ool General Purpose Roll (1000) 50mm thick in one leaf of separating wall. Alternat ively, 25mm of mineral woo l (paper faced on one side) may be suspended in th e cavity f or t he fu ll storey height.

20.

Resilient upstand (str ips of EPS or Extrud ed Polystyrene).

21.

Gap: A 3mm gap must be retained betw een the wall lining, skirt ing and w alking surf ace to maint ain the correct isolat ion so as to prevent fl anking tr ansmission of i mpact sound . This may, if desired, be ‘pugg ed’ wi th loose mineral w ool o r sealed wit h polysulph ide masti c.

brickwork. 36.

Weephole in perpend joint, min. two per opening and at 900mm m ax. cent res.

37.

Flexible and compressible mastic sealant.

38.

Semi rigid slab insulation.

39.

Trussed rafter.

40.

Gable ladder.

25


Board fixing on site

Run of ceiling – Lath and Baseboard Boards are installed as fo r Wallb oards, except th at t he

The fol lowin g gives an appreciation of installation pro cedures. For f ull fi xing d etails cont act Brit ish Gypsum Technical Service Depart ment on 0990 456123. Timber frame ext ernal walls Facto ry–produced timber w all panels of t he required dimension are installed t o f orm t he str uctur al building f rame. Stu ds are unif orml y spaced at max. 600mm in tervals, wi th additional fr aming installed as required t o support heavy fi xtur es or adjoi ning p art it ions. Isow ool Timber Frame Batt s

rou nded edge of Gyproc Lath and t he square edge of Gyproc Baseboard only require t o be supported by n oggings at t he perimeter. Services Electr ical and ot her services are install ed w it hin t he stu d or flo or cavity prior t o f itt ing insulation. Timber noggin gs are installed to support recessed switch boxes / socket outlets. Addit ional lining s may be required t o maint ain f ire resistance and acousti c perfo rmance.

1005 are fit ted in to t he stu d cavity. Alt ernati vely, if an Isow ool rol l is used, it shoul d be suspended b etw een stu ds. Gyproc Wallboard Dup lex is nail–fixed t o all f raming memb ers at 150mm cent res, or screw–f ixed at 300mm cent res,

Table 11 Provision of timbe r noggings in floors

Board thickness ¶

Max. j oist centres w it h nog gings w it hout n oggi ngs mm mm

to f orm t he lining. Where door or w indow openings occur, lint els and addit ional vert ical stu ds are normally incorpor ated wit hin w all units during f actor y constru ctio n.

mm

..................................................................................... 9.5

450

400

Timber stud partit ions and w alls

12.5

600

450

Timber o f t he required d imensions is install ed to t he

15

—

600

perimeter, abutment s, and t o f rame any openings. Addit ional

19

—

750

fr aming is install ed as requir ed to suppo rt heavy f ixtu res. Isow ool in sulat ion i s suspended in th e cavity wh ere requir ed. Wher e Gypro c Resili ent Bars are specif ied, t hese are f ixed across stu ds, at 600mm cent res, w it h o ne f ixing per stud

..................................................................................... ¶ Noggings are recommended for Fireline board and Duplex grade boards, regardless of joi st spacing, t o ensure that fire and/ or vapour control integrit y is maintained. When f ixing Gyproc Lath or Baseboard, noggings are not required in t he field of t he boards.

position . Gyproc plaster board i s nail–fixed t o all f raming memb ers at 150mm cent res, or screw–f ixed at 300mm cent res, to for m t he lining. Addit ional boarding is nail or screw–fixed as specif ied. At door openin gs, fu ll–height stu ds are located bot h sides of the opening t ogether w ith a timber head piece. Door facings are then fixed to t he timber gro und. Timber joist ceilings and compartment floors Run of ceiling – Wallboard lin ings Boards should be f ixed to f orm t he ceiling wit h t he long edges at r ight angles to th e joists. Cut ends must be located over a joist o r t imber n oggi ng suppo rt . Unless 15mm Gyproc Wallboard is used, tim ber nog ging s shoul d be pro vided betw een joists at t he perimeter t o support board edges in t he field of the boards (see Table 11). Board s are f ixed using Gyproc Nails inserted at 150mm centres, or Gyproc Drywall Screws insert ed at 230m m centr es. For d oub le layer ceilin gs, noggings are set out to suit the second l ayer t o pro vide fixing and supp ort fo r board edg es. All join ts are stagg ered in relation t o the f irst layer. In tr ussed raft er sit uat ions, it i s possible t hat t he bot to m chord of th e tr uss can be as lit tl e as 35mm th ick. Where board ends but t and f ire resistance is a requirement , it is import ant that additional t imber is planted on t he side of t he truss to give an adequ ate b earing surf ace, (see Fig 1).

26

Fig 1

Fixing boards to trussed rafter s

35mm

25mm


Nail / screw –fi xing Table 12 gives th e recommend ed lengt h of f ixings. Where th ere is a risk of nail pop ping t he use of Gyproc Drywall Screws shou ld b e con sider ed. Fixin g t ol erances are gi ven in Fig 2.

Table 12 Fixing plasterboard to timber supports

Plasterboard t hi ckness

Gyproc Drywall Screws t o f ix plast er board f or direct decorat ion

mm

mm

Gyproc Nails to fix pl ast erboard f or direct decorat ion or plast ering to timber mm

9.5

32

30

..................................................................................... 12.5

36

40

15

36

40

19

42

50

12.5 over 12.5

50

50

15 over 15

60

65

12.5 over 19

60

65

15 over 19

60

65

..................................................................................... Note: Nail fixing to timber supports. Drive the nails into the timber straight – not skewed and not closer than 6mm from the timber edge (see Fig 2). If the timber support has insufficient bearing surface, fix a further timber support to it, or, in the case of joists and trusses, consider using suitable counter–battens. Drive the nails firmly home without fracturing the paper surface, but leaving a shallow depression to f acilitat e spotting.

Fig 2

5.65m high structural element s

Fixing tole rances

A 6mm min Boards should be lightly butted with a max. separation of 3mm. Where a cut edge occurs dimension A i s 13mm min; where a bound edge occurs dimension A is 10mm min.

Built-up elements

27


Prefabrication

Structural element s

Internal structure

28

Typical Dormer w indow


Acknowledgements

British Gypsum would like to thank t he Timber and Brick Inf ormat ion Council, together with Laing Homes, f or t heir assist ance and support in preparation of this brochure.

The Timber and Brick Information Council is the recognised trade association representing manufacturers and designers of timber frame buildings in England and Wales.

Technical support For technical guid ance or specification

For technical inf ormation and gui dance on stru ctur al

supp ort on Brit ish Gypsum pr oducts,

elements, constr uction detail s, cladding opt ions, and t he

contact :

Timber and Brick Q–mark, contact :

British Gypsum Limited

The Timber and Brick Infor mati on Council

Technical Service Depar t ment

Gable House

East Leake

40 High St reet

Loughborough

Rickmansworth

Leics.

Herts.

LE12 6JT

WD3 1ES

Tel :

0990 456123

Tel :

01923 778136

Fax :

0990 456356

Fax :

01923 720724

em ai l

h sd _t i mb er @m sn .co m

29

Timber Frame

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