C06. S06. P02 – P20 Loadbearing timber joist floors

C06.S06.P02–P20 Loadbearingtimberjoistfloors IncludingC06.S01.P02–P08

Floorsandceilingsintroduction

!Thissectionincludesupdatedinformation,addedsinceitwasfirst

publishedinDecember2015.

Last updated 08/02/2021

british-gypsum.com

Floors and ceilingsThis section details floors and ceilings systems which cover a multitude of performance requirements in all sectors

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C06. S01. P02 0115 945 6123 [email protected]

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Floors and ceilings

British Gypsum offers a full range of specifications from simple plasterboard ceilings through to a range of gypsum-based, acoustic suspended ceilings and lay-in grid systems. They cover all building categories, including private and social housing, apartments, healthcare, educational facilities, recreational and industrial properties in both new-build and refurbishment and can satisfy the most demanding performance requirements.

When specifying floor and ceiling solutions, a number of performance characteristics are normally used to determine the required solution. Depending on the project or construction type, these performance parameters could be set by minimum regulatory standards, or a client or customer requirement, for buildings that offer the highest standards of performance and comfort.

Our quick-reference floors and ceilings system guide, below, allows you to simply select the performance categories of interest and identify the British Gypsum floor and ceiling systems which best satisfy your project requirements.

Fire

performancemins

Installed cavity depth

mm

Acoustic performance

System PageRwdB Rw + C

trdB Ln,w

dB αw

30 - 120 ≥100 56 - 66 50 - 55 68 - 50 0.35 - 0.85 CasoLine mf C06. S02. P02

- ≥100 - - - 0.35 - 0.852 CasoLine curve C06. S03. P02

30 - 90 25 - 175 52 - 63 50 66 - 55 0.35 - 0.85 GypLyner universal C06. S04. P02

30 - 90 - 54 - 63 47 - 51 63 - 55 - GypFloor silent1 C06. S05. P02

30 - 120 - 36 - 66 50 - 55 78 - 48 - Timber floors C06. S06. P02

30 - 60 - - - - - Cavity barriers C06. S07. P02

1 Where the floor can only be accessed from above, the fire and accoustic performances can be upgraded with the GypFloor silent system.2 Indicative first test performance only.

C06. S01. P03 british-gypsum.com

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Good practice specification guidance

British Gypsum’s systems are designed and tested to meet every performance requirement and are fully supported by our SpecSure® lifetime system warranty.

This means that when our systems are installed following our guidance they will achieve every performance claim we make, and if they don’t then we’ll put it right. To maximise the performance achieved on site, consider the following good practice specification guidance:

— Consider flanking transmission at the design stage and ensure construction detailing is specified to eliminate, or at least to minimise, any downgrading of the acoustic performance. The sound insulation values quoted in system performance tables are laboratory values and the practicalities of construction will mean that acoustic performances measured in the laboratory will be difficult to achieve on site

— Small openings such as gaps, cracks or holes will conduct airborne sounds and can significantly reduce the sound insulation of a construction. For optimum sound insulation a construction must be airtight

— When designing spaces requiring separation by sound insulating floors and ceilings abutting structural steelwork, consideration should be given to the potential loss of sound insulation performance through the steelwork


Table1–RecommendedlaboratoryperformancetomeetrequirementsofBuildingRegulationsApprovedDocumentE(EnglandandWales)

Where applicable Minimum airborne

sound insulation

DnT,w

+ Ctr (site test result)

Recommended

performance Rw

+ Ctr

(laboratory test result)

Maximum impact

sound transmission

L’nT,w

(site test result)

Recommended

performance

Ln,w


Separating walls between new homes 45dB 54dB - -

Separating walls between purpose-built

rooms for residential purposes

43dB 52dB - -

Separating walls between rooms created by

a change of use or conversion

43dB 52dB - -

Separating floors between new homes and

purpose-built rooms for residential purposes

45dB 54dB 62dB 57dB - 52dB

(depending on

construction method)

Separating floors between rooms created by

a change of use or conversion

43dB 52dB 64dB 59dB - 54dB

(depending on


Table2–RecommendedlaboratoryperformancetomeetrequirementsofTechnicalHandbookSection5(Scotland)

Where applicable Minimum airborne

sound insulation

DnT,w

(site test result)

Recommended

performance Rw


Maximum impact

sound transmission

L’nT,w

(site test result)

Recommended

performance

Ln,w


Separating walls between new homes,


and conversions (not including traditional

buildings1)

56dB 63dB - -

Separating walls between rooms created by

a change of use or conversion (traditional

buildings1)

53dB 60dB - -

Separating floors between new homes,


and conversions (not including traditional

buildings 1)

56dB 63dB 56dB 51dB - 46dB

(depending on


Separating floors between rooms created by

a change of use or conversion (traditional

buildings1)

53dB 60dB 58dB 53dB - 48dB

(depending on


1 Definition of traditional buildings.

A building or part of a building of a type constructed before or around 1919:

a) using construction techniques that were commonly in use before 1919; and

b) with permeable components, in a way that promotes the dissipation of moisture from the building fabric.


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Gyptone quattro 46 (plenum depth 400mm)

Gyptone quattro 46 (plenum depth 400mm plus

100mm Isover Spacesaver Ready-Cut)

Practical absorption coefficient α

p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.65 0.60 0.55 0.45 0.40 0.35 0.45(L) D 0.50

0.60 0.60 0.65 0.55 0.45 0.40 0.50(L) D 0.55

Gyptone quattro 42 (plenum depth 50mm)3


p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.20 0.40 0.60 0.60 0.45 0.40 0.50 D 0.55



p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.50 0.70 0.80 0.70 0.60 0.55 0.65 C 0.70

System reference C10A014

C10A015

QUATTRO 46 Sound absorption coefficient αp

0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)

Gyptone performance

Table 3 – Sound absorption data for Gyptone boards

1 AC - Absorption Class.2 NRC - Noise Reduction Coefficient.3 Due to installation limitations the minimum cavity size that can be constructed with CasoLine mf or CasoLine curve system is 100mm. The sound absorption

performance for these systems is estimated to be equivalent to that of the same system built with a 50mm plenum.

All products have been tested to BS EN 20354 and ISO 354. The single figure rating practical sound absorption coefficient αw

is calculated in accordance

with EN ISO 11654. Suffix letters indicate where performance is limited at either low, medium or high frequencies.

QUATTRO 41


Sound absorption coefficient αp

0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)


0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)



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Gyptone sixto 63 (plenum depth 200mm)


p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.35 0.60 0.70 0.60 0.55 0.55 0.60 C 0.60

Gyptone line 6 (plenum depth 400mm)

Gyptone line 6 (plenum depth 400mm plus

100mm Isover Spacesaver Ready-Cut)


p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.70 0.65 0.60 0.50 0.40 0.35 0.45(L) D 0.55

0.70 0.70 0.65 0.65 0.50 0.45 0.55(L) D 0.65


Gyptone quattro 47 (plenum depth 400mm plus

50mm Isover Acoustic Partition Roll (APR 1200))


p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.45 0.50 0.45 0.40 0.30 0.25 0.35(L) D 0.40

0.50 0.55 0.50 0.40 0.30 0.30 0.40(L) D 0.45

Gyptone performance (continued)

Table 3 (continued) – Sound absorption data for Gyptone boards


C10A017


0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)


C10A002

LINE 6 Sound absorption coefficient αp

0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)


SIXTO 63 Sound absorption coefficient αp

0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)

1 AC - Absorption Class.2 NRC - Noise Reduction Coefficient.





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Rigitone performance

Table 4 – Sound absorption data for Rigitone boards

1 AC - Absorption Class.2 NRC - Noise Reduction Coefficient.3 Due to installation limitations the minimum cavity size that can be constructed with CasoLine mf or CasoLine curve system is 100mm. The sound absorption





8-15-20 SUPER Sound absorption coefficient αp

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)


C10A059

C10A069

Rigitone 8-15-20 super (plenum depth 50mm)3

Rigitone 8-15-20 super (plenum depth 200mm)

Rigitone 8-15-20 super (plenum depth 200mm plus

50mm Isover Frame Batt 32)


p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.15 0.40 0.70 0.75 0.45 0.40 0.50(M) D 0.55

0.35 0.75 0.75 0.55 0.40 0.30 0.45(LM) D 0.60

0.60 0.85 0.80 0.65 0.45 0.30 0.45(LM) D 0.70

Rigitone 8/18 (plenum depth 50mm)3

Rigitone 8/18 (plenum depth 200mm)

Rigitone 8/18 (plenum depth 200mm plus 50mm Isover Frame Batt 32)


p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.10 0.30 0.65 0.85 0.55 0.30 0.50(M) D 0.55

0.35 0.75 0.90 0.60 0.50 0.40 0.55(LM) D 0.70

0.60 0.95 0.95 0.80 0.70 0.50 0.70(LM) C 0.85


C10A037

C10A060

8/18 Sound absorption coefficient αp

0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)


C10A124

C10A126

8/18 Q Sound absorption coefficient αp

0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)

Rigitone 8/18 q (plenum depth 50mm)3

Rigitone 8/18 q (plenum depth 200mm)

Rigitone 8/18 q (plenum depth 200mm plus

25mm Isover Acoustic Partition Roll (APR 1200))


p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.15 0.25 0.60 0.85 0.65 0.50 0.55(M) D 0.60

0.40 0.65 0.80 0.60 0.55 0.50 0.60 C 0.65

0.40 0.70 0.85 0.80 0.80 0.70 0.80 B 0.80

0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000


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Rigitone performance (continued)

Table 4 (continued) - Sound absorption data for Rigitone boards

1 AC – Absorption Class.2 NRC – Noise Reduction Coefficient.3 Due to installation limitations the minimum cavity size that can be constructed with CasoLine mf or CasoLine curve system is 100mm. The sound absorption





10/23


C10A039

C10A061


0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)



Rigitone 10/23 (plenum depth 200mm plus



p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.10 0.25 0.65 0.90 0.55 0.25 0.45(M) D 0.60

0.35 0.70 0.85 0.60 0.50 0.35 0.50(LM) D 0.65

0.65 0.95 0.90 0.80 0.65 0.45 0.65(LM) C 0.80

12-20/66


C10A043

C10A063


0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)

Rigitone 12-20/66 (plenum depth 50mm)3

Rigitone 12-20/66 (plenum depth 200mm)

Rigitone 12-20/66 (plenum depth 200mm plus



p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.10 0.25 0.60 0.85 0.55 0.30 0.45(M) D 0.55

0.40 0.70 0.85 0.60 0.50 0.35 0.50(LM) D 0.65

0.55 0.95 1.00 0.85 0.70 0.55 0.70(LM) C 0.90






p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.05 0.25 0.65 0.85 0.65 0.50 0.55(M) D 0.60

0.35 0.75 0.90 0.65 0.55 0.40 0.55(LM) D 0.70

0.55 0.95 0.95 0.85 0.70 0.50 0.70(LM) C 0.85

12/25


C10A129

C10A128


0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)


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Rigitone performance (continued)

Table 4 (continued) – Sound absorption data for Rigitone boards

1 AC – Absorption Class.2 NRC – Noise Reduction Coefficient.3 Due to installation limitations the minimum cavity size that can be constructed with CasoLine mf or CasoLine curve system is 100mm. The sound absorption





Rigitone 12/25 q (plenum depth 50mm)3

Rigitone 12/25 q (plenum depth 200mm)

Rigitone 12/25 q (plenum depth 200mm plus



p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.10 0.30 0.65 0.90 0.80 0.60 0.60(M) C 0.65

0.35 0.75 0.90 0.70 0.65 0.50 0.65(LM) C 0.75

0.55 0.90 0.95 0.85 0.85 0.65 0.85(L) B 0.90






p

125 250 500 1k 2k 4k αW

AC1 NRC2

0.10 0.25 0.60 0.85 0.55 0.30 0.45(M) D 0.55

0.35 0.70 0.85 0.60 0.50 0.35 0.50(LM) D 0.65

0.60 0.95 1.00 0.85 0.70 0.55 0.70(LM) C 0.85


C10A041

C10A062

15/30 Sound absorption coefficient αp

0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)


C10A130

C10A132

12/25 Q Sound absorption coefficient αp

0.0

0.2

0.4

0.6

0.8

1.0

125 250 500 1000 2000 4000

Prac

tica

l abs

orpt

ion

coe

ffic

ien

t α p

Frequency (Hz)

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Loadbearing timber joist floorsInternal and separating floor systems


C06Loadbearin

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Refer to C01. S01. P07

System can be skim finished with

ThistlePro PureFinish. Refer to C02. S01. P49

Loadbearing timber joist floors

Timber joists are widely used within internal floor and separating floor construction, both in residential and commercial applications. Our range of timber joist floor solutions include cavity insulation, high-performance Gyproc plasterboards and Gypframe sound insulating bars. Our solutions maximise acoustic and fire performance, to both meet, and significantly exceed, the requirements of Building Regulations, for new build and refurbishment projects.

Key benefits

—WhenGyprocplasterboardsaredirectly fixed,defectsareminimisedusing BritishGypsumDrywallScrews

—Nailpoppingiseliminatedthroughtheuse ofGypframeRB1ResilientBarand GypframeRB2SureFixBar

—Significantlyenhancedacousticperformance isachievedwhenGypframeRB1ResilientBar isspecifiedalongsideGyprocSoundBloc plasterboardlinings

You may also be interested in...

CasoLinemfAsuspendedceilingsystem,capableofprovidingupto120minutesfireresistance.Suitableforinternaldryliningapplicationtotimberjoistfloors.ThefullyconcealedgridandceilingliningcanbeusedinconjunctionwithGyprocplasterboardsandGyptoneorRigitoneacousticceilingboardstocreateaseamless,monolithicappearance.

Refer to C06. S02.P02 – CasoLinemf.

mins30 120

Rw

dB36 66

Ln,w

dB78 48


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Loadbearing timber joist floors performance Ceiling directly fixed to new or existing solid timber joist floors

Table 1a - Solutions to satisfy requirements of BS EN 1365-2

1

Detail Nominal

floor

depth

mm

Board

type

Ceiling lining

thickness

mm

Noggings

required

Maximum

loadbearing

ratio

Sound insulation System

referenceAirborne

Rw dB

Impact

Ln,w dB

30 minutes fire resistance

1 227 Glasroc F multiboard 1 x 10 Yes2 100% - - G106036

1 232 Gyproc WallBoard 1 x 15 Yes3 100% 40 - C106029

4 277 Gyproc WallBoard 1 x 15 Yes3 -4% 41 - C206015


2 237 Glasroc F multiboard 2 x 10 Yes2 100% - - G106022

2 242 Gyproc FireLine 2 x 12.5 Yes2 100% 40 76 C016009

2 245Gyproc WallBoard (inner layer)

+ Gyproc FireLine (outer layer)1 x 12.5 + 1 x 15 Yes3 100% 40 76 C016008


3 255 Gyproc FireLine 3 x 12.5 Yes2 100% 40 - C016012

22mm t&g1 (softwood or chipboard)

floor boarding over minimum

195mm x 38mm timber joists at

600mm centres. Noggings and

linings as in table.


floor boarding over minimum 195mm x

38mm timber joists at 600mm centres.

Noggings and linings as in table.

2

For further assistance in choosing the right solution for your project, try the White Book System Selector; an online tool that enables quick and

easy filtering by performance criteria. It provides system specific information downloads including BIM (Revit) objects. Go to british-gypsum.com

1 Fornont&gfloors,overlaywith6mmplywoodandensurealljointsarestaggered.2 Atceilingperimeterandtosupportouterlayerceilingboardjoints(38mmx38mmminimum).3 Atceilingperimeteronly.4 Floortestedwithauniformlydistributedloadof1.5kN/m2

5 Joistdescription:240mmdeep‘I’joistwith45mmx36mmdeeplaminatedveneerlumber(LVL)flangesand10mmthickorientedstrandboard(OSB3)web.

Consultmanufacturersdirectlyforfireresistancesubstantiationforothertypesof‘I’joistnotdescribedabove.

Thefireresistanceandsoundinsulationperformancesareforimperforatepartitions,wallsandceilingsincorporatingboardswithalljointstapedand

filled,orskimmedaccordingtoBritishGypsum’srecommendations.ThequotedperformancesareachievedonlyifBritishGypsumandSaint-GobainIsover

componentsareusedthroughout,andtheCompany’sfixingrecommendationsarestrictlyobserved.Anyvariationinthespecificationsshouldbecheckedwith

BritishGypsum.

Whereboardsarefixeddirecttotimberjoists,BritishGypsumDrywallScrewsshouldbeusedasopposedtonail-fixingtominimisetheriskoffixing

defectsoccurring.


floor boarding over minimum 195mm x

38mm timber joists at 600mm centres

(maximum). Noggings and linings as

in table.

3

Handy hint

ForfurtherinformationregardingBuildingRegulationsacousticperformancerequirements.

Refer to C02. S01. P08 – Building acoustics

For details of when

to specify fire

resistance using EN



floor boarding over 240mm deep

timber ‘I’ joists5 at 600mm centres.


4


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Loadbearing timber joist floors performance (continued)

Ceiling directly fixed to new or existing solid timber joist floors

2



195mm x 38mm timber joists at 600mm

centres. Noggings and linings as in table.



195mm x 38mm timber joists at 450mm

centres. Noggings and linings as in table.






3






22mm t&g1 (softwood or chipboard) floor

boarding over minimum 195mm x 50mm

timber joists at 450mm centres. Noggings

and linings as in table.


floor boarding over 240mm deep

timber ‘I’ joists5 at 600mm centres.


Detail Nominal

floor

depth

mm

Board

type

Ceiling lining

thickness

mm

Noggings

required

Maximum

loadbearing

ratio


referenceAirborne

Rw dB

Impact

Ln,w dB


2 230 Gyproc WallBoard 1 x 12.5 Yes2 60% 36 - C014003

1 232 Gyproc WallBoard 1 x 15 Yes2 100% 40 - C106029

6 277 Gyproc WallBoard 1 x 15 Yes2 -4% 41 - C206015


3 242 Gyproc FireLine 2 x 12.5 Yes3 100% 40 76 C016009

4 245Gyproc WallBoard (inner layer)

+ Gyproc FireLine (outer layer)1 x 12.5 + 1 x 15 Yes2 100% 40 76 C016008

5 247 Gyproc WallBoard 2 x 15 Yes3 60% 40 76 C0160066

5 249Gyproc Plank (inner layer)

+ Gyproc WallBoard (outer layer)1 x 19 + 1 x 12.5 Yes2 60% 40 75 C0160076



1 Fornont&gfloors,overlaywith6mmplywoodandensurealljointsarestaggered.2 Atceilingperimeteronly.3 Atceilingperimeterandtosupportouterlayerceilingboardjoints.4 Floortestedwithauniformlydistributedloadof1.5kN/m2

5 Joistdescription:240mmdeep‘I’joistwith45mmx36mmdeeplaminatedveneerlumber(LVL)flangesand10mmthickorientedstrandboard(OSB3)web.

Consultmanufacturersdirectlyforfireresistancesubstantiationforothertypesof‘I’joistnotdescribedabove.6SpecificationbasedonBR128onlyforuseinScotland,pleaserefertoBuildingstandardstechnicalhandbook2019Section2.




BritishGypsum.


defectsoccurring.

Allthe30and60minutespecificationsintable1bcanbeusedontheundersideofanexistinglathandplasterceilingprovidedtheexistingceilingis

supportedbychickenwiresecurelyfixedtothejoistsandcounterbattenedwithminimum38mmx38mmtimberat600mmcentres,withnoggingstosupport

thelongedgesoftheouterlayerboard.

1 4

65

Table 1b - Solutions to satisfy the requirements of BS 476: Part 21: 1987

For details of when

to specify fire

resistance using BS



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Non-combustible ceiling linings directly fixed to new or existing solid timber joist floors

1 2

18mm t&g1 (softwood or chipboard) floor boarding over

minimum 195mm x 38mm timber joists at 450mm

centres with suitable noggings between joists to support

board edges. Linings as in table.





3





4

Table 2 – Solutions to satisfy the requirements of BS 476: Part 21: 1987

Detail Nominal

floor

depth

mm

Board

type

Ceiling

lining

thickness

mm

Noggings

required

System

reference


1 219 Glasroc F multiboard 1 x 6 Yes3 G104019



2 232 Glasroc F firecase (screw-fixed)2 1 x 15 Yes3 G106025

4 233 80mm wide Glasroc F multiboard strip + Glasroc F multiboard 1 x 10 + 1 x 10 No G104024


5 237 80mm wide Glasroc F multiboard strip + Glasroc F multiboard 1 x 10 + 1 x 10 Yes3 G106046



1 Fornont&gfloors,overlaywith6mmplywoodandensurealljointsarestaggered.2 Use58mmGlasrocFfirecaseScrewsat150mmcentres,andincreasethewidthofthetimberjoistsatthelocationofboardendsusing25mmx25mmtimber

battens.3 Atceilingperimeterandtosupportouterlayerceilingboardjoints(38mmx38mmminimum).




BritishGypsum.


defectsoccurring.

5

18mm t&g1 (softwood or chipboard) floor boarding

over minimum 195mm x 50mm timber joists at

400mm centres. 30mm stone mineral wool (64kg/m3)

in the cavity. Linings as in table.

22mm t&g1 (softwood or chipboard) floor boarding

over minimum 195mm x 50mm timber joists at

600mm centres with suitable noggings between joists

to support board edges. 60mm stone mineral wool

(23kg/m3) in the cavity. Linings as in table.

For details of when

to specify fire

resistance using BS



C06

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d ceilings


New or replacement ceilings to solid timber joists

Table 3 – Solutions to satisfy the requirements of BS 476: Part 21: 1987

Detail Ceiling specification Joist centres Joist width (minimum)

mm

System

reference


1Ribbed metal lath1 with 13mm Thistle BondingCoat and

2mm Thistle MultiFinish600 44 C0160162

1 Ribbed metal lath1 with 19mm Thistle Universal OneCoat 600 38 C0160172


1Ribbed metal lath1 with 19mm Thistle BondingCoat and

2mm Thistle MultiFinish600 48 C016045



1 Whereplasterisappliedtoribbedmetallath,theplasterthicknessismeasuredfromthefaceofthelath,andthelathshouldbeinstalledinaccordancewith

themanufacturers’recommendations.With120minutesfireresistanceconstruction,themetallathisindependentlyfixedwithwiresupportsfromthejoist

sides.RefertoC07.S02.P06–Plastersystems,design,Howtoapplyplastertometallath.2SpecificationbasedonBR128onlyforuseinScotland,pleaserefertoBuildingstandardstechnicalhandbook2019Section2.

ThistleplasterisclassifiedA1(exceptThistleProDuraFinishwhichisA2-s1,d0)inaccordancewithBS EN 13501-1: 2002.

1

21mm t&g (softwood or chipboard) floor boarding over

timber joists at 600mm centres with suitable timber

noggings between joists to support metal lathing.

Plaster to metal lathing as in table.

For details of when

to specify fire

resistance using BS



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Detail Nominal

floor

depth

mm

Board

type

Ceiling lining

thickness

mm

Maximum

loadbearing

ratio


referenceAirborne

Rw dB

Impact

Ln,w dB


1 258 Gyproc FireLine 2 x 12.5 100% 45 72 C016031

2 263 Gyproc SoundBloc 2 x 15 100% 54 60 C206009


Ceiling indirectly fixed to new or existing solid timber joist floors

1

Table 4a - Solutions to satisfy the requirements of BS EN 1365-2



timber joists at 600mm centres.

Gypframe RB1 Resilient Bars fixed to

underside of joists at 450mm centres and

at perimeter with ceiling linings as in

table fixed into the bars only.



timber joists at 600mm centres. Gypframe RB1

Resilient Bars fixed to underside of joists at

450mm centres and at perimeter with ceiling

linings as in table fixed into the bars only.

100mm Isover Spacesaver Ready-Cut

in the cavity.



1 Fornont&gfloors,overlaywith6mmplywoodandensurealljointsarestaggered.




BritishGypsum.


defectsoccurring.

2

For details of when

to specify fire

resistance using EN



C06

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Ceiling indirectly fixed to new or existing solid timber joist floors

1 2

Table 4b - Solutions to satisfy requirements of BS 476: Part 21: 1987




Gypframe RB2 SureFix Bars fixed to underside of

joists at 450mm centres and at perimeter with

ceiling linings as in table fixed into the bars only.

100mm Isover Acoustic Partition Roll (APR 1200)

in the cavity.




Gypframe RB1 Resilient Bars fixed to

underside of joists at 450mm centres and at

perimeter with ceiling linings as in table fixed

into the bars only.




Gypframe RB1 Resilient Bars fixed to underside

of joists at 450mm centres and at perimeter

with ceiling linings as in table fixed into the

bars only. 100mm Isover Spacesaver Ready-Cut

in the cavity.

Detail Nominal

floor

depth

mm

Board

type

Ceiling lining

thickness

mm

Maximum

loadbearing

ratio


referenceAirborne

Rw dB

Impact

Ln,w dB


1 240 Gyproc WallBoard 1 x 12.5 100% 41 76 C206006


2 258 Gyproc FireLine 2 x 12.5 100% 45 72 C016031

3 263 Gyproc SoundBloc 2 x 15 100% 54 60 C206009



1 Fornont&gfloors,overlaywith6mmplywoodandensurealljointsarestaggered.




BritishGypsum.


defectsoccurring.

3

For details of when

to specify fire

resistance using BS



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Detail Board

type

Ceiling lining

thickness

mm

Noggings

required

Insulation

type

System

reference


1 Gyproc WallBoard 2 x 15 Yes1 150mm Isover Spacesaver Ready-Cut C106052

1 Gyproc FireLine 2 x 12.5 Yes1 150mm stone mineral wool (24kg/m3) C106048


2 Glasroc F firecase 2 x 15 No 25mm stone mineral wool (100kg/m3) G106040


3 Gyproc FireLine 4 x 15 No 150mm stone mineral wool (22kg/m3) C100038



1 Atceilingperimeterandtosupportouterlayerceilingboardjoints.




BritishGypsum.


defectsoccurring.

1

150mm x 38mm (minimum) chords at 600mm

(maximum) centres. Insulation and

ceiling linings as in table.


Ceiling directly fixed to bottom chord of trusses below the roof space (non-loadbearing)Table 6a - Solutions to satisfy the requirements of BS EN 1364-2

For details of when

to specify fire

resistance using EN


CasoLine mf suspended from bottom

chord. Insulation laid over Gypframe

grid. Linings as in table.

2

CasoLine mf suspended from bottom chord.

Gypframe MF7 at 600mm centres suspended

at 1200mm centres. 150mm stone mineral

wool (22kg/m3) laid over Gypframe grid.

Linings as in table.

3


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Ceiling directly fixed to bottom chord of trusses below the roof space (non-loadbearing)Table 6a - Solutions to satisfy the requirements of BS EN 1364-2



1 Nominal50mmx25mmtimberbattensshouldbefixedtothesideoftimbersupportswheretheceilingboardsbutttomaintainanadequatebearingsurface.

Refertoconstructiondetail7.2 Atceilingperimeterandtosupportouterlayerceilingboardjoints.




BritishGypsum.


defectsoccurring.

Detail Board

type

Ceiling lining

thickness

mm

Noggings

required

Insulation type System reference


1 Glasroc F multiboard 1 x 12.5 Yes2 150mm Isover Spacesaver Ready-Cut G106041

2 Gyproc WallBoard 2 x 12.5 Yes2 150mm Isover Spacesaver Ready-Cut C106049

1 Gyproc FireLine 1 x 12.5 Yes2 150mm Isover Spacesaver Ready-Cut C106047

4 Gyproc WallBoard 2 x 12.5 No 100mm Isover Spacesaver Ready-Cut C106045


2 Glasroc F multiboard 2 x 10 Yes2 150mm Isover Spacesaver Ready-Cut G106042

3 Gyproc FireLine 2 x 12.5 Yes2 150mm stone mineral wool (24kg/m3) C106048




1 2 3

CasoLine mf suspended from chords.

Insulation laid over Gypframe grid.


4


Ceiling directly fixed to bottom chord of trusses below the roof space (non-loadbearing)Table 6b - Solutions to satisfy requirements of BS 476: Part 22: 1987

For details of when

to specify fire

resistance using BS


38mm (minimum) timber joists or 35mm (minimum)1

bottom chord of trusses at 600mm centres, with

suitable timber noggings between joists to support

board edges. Insulation laid between joists (see table).



bottom chord of trusses at 600mm centres, with

suitable timber noggings between joists to support

board edges. Insulation laid between joists (see table).



bottom chord of trusses at 600mm centres, with suitable

timber noggings between joists to support board edges.

Insulation laid between joists (see table).


CasoLine mf suspended from bottom chord. Gypframe

MF7 at 600mm centres suspended at 1200mm cen-

tres. 150mm stone mineral wool (22kg/m3) laid over

Gypframe grid. Linings as in table.

5


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Planning – key factors

Tominimisetheriskofceilingfinishdefectsoccurring,seasoned

timberwithamoisturecontentnotexceedingthatrecommended

inBS 5268: Part 2: 2002shouldbeused.Thecontractorshould

ensurethattimbersupportsareaccuratelyspaced,aligned,and

levelled.BritishGypsumDrywallScrewsarethepreferredmethod

offixing.

Cavity barriers

Cavitybarriersmayberequiredtosatisfytherequirementsofthe

BuildingRegulations.

Refer to C06. S07. P02 – Cavity barriers.

Strength and robustness

Timbershouldbealignedandlevel,andshouldmeetthe

requirementsofBS 5268: Part 2: 2002.Thedimensionsand

assemblyoftimbersupportsshouldbesufficienttoallowpositive

fixingofplasterboardwithoutbounceorunduedeflection

becauseofscrewingorotherappliedforce.Whentheabovefixing

conditionscannotbemet,atimberbattenshouldbesecurelyfixed

tothesideofthetimbersupportswhereceilingboardsbutt,in

ordertoincreasethebearingsurface.

Whereboardsarefixedatmaximumcentresinadverseconditions,

thestandardofliningcanbeaffected.Adverseconditionscan

generallybedescribedasconditionswherehighhumidityoccurs,

principallyinthecold,damp,autumn/winterperiod.Theyalso

refertobuildingsunderconstructionoverthisperiod,whereboth

thestructureandwetapplicationssuchasplasteringandscreeding

aresubjecttoslowdryingconditions.Intheseadverseconditions

thereisariskoftheplasterboardbowingandthereforeadditional

plasterboardsupportframingshouldbeincorporated.

Water vapour control

Whereavapourcontrollayerisincludedintheceilingconstruction

inconditionsdescribedpreviously,condensationcanformon

thevapourcontrolsurface.Thiscanresultinplasterboard

becomingundulydamp,andaffectingthestandardofacceptability

oftheliningandanyappliedplasterortexturedcoating.Inthese

circumstancesincreasedventilationordehumidificationis

recommended.

Wherethereisarequirementforavapourcontrollayer,duplexgrade

Gyprocplasterboardsshouldbespecifiedasthefacelayer,i.e.the

secondlayerindoublelayerlinings.Theapplicationoftwocoats

ofGyprocDrywallSealertothefaceliningwillalsoprovidevapour

control.

Loadbearing timber joist floors design

Timbernoggingsshouldalwaysbeincorporatedwhenfixing

boardsofferingavapourcontrollayer,irrespectiveofjoistspacing,

e.g.duplexgradeGyprocplasterboardandthermallaminates

providingvapourcontrol.


Airtightnessisessentialforoptimumsoundinsulation.Whilemost

junctionswillbesealedwithstandardfinishingmaterials,gapsat

theperimeterofthefloorandceiling,andothersmallairpaths,

canbesealedusingGyprocSealant.Theperformanceofthefloorin

practicewillgenerallybegovernedbyflankingtransmission.

Refer to section C02. S01. P08 – Building acoustics.

Imposed loads

Thedesignershouldensurethatthefloorconstructionissuitable

tosupportanyimposedloads.

Timber noggings within timber floors (direct fix applications)

Suitabletimbernoggings,typically38mmx38mmor50mmx

50mm,mayberequiredbetweenjoistsandattheceilingperimeter

tosupporttheedges/endsoftheboard.Theprovisionofnoggings

dependsonseveralfactors;thethicknessoftheboard,spacingof

thetimberjoistsandanytechnicalperformancerequirements,

e.g.vapourresistanceandfireresistanceperformance.Table7

belowprovidesinformationonthegeneralrequirementof

noggings.However,referencemustalsobemadetotherelevant

technicalperformancetables(1-6b)onthepreviouspagesto

establishtheneedfornoggingsinfire-ratedsituations.

Handy hint

ForfurtherinformationregardingBuildingRegulationsacousticperformancerequirements.

Refer to C02. S01. P08 – Building acoustics.

Table 7 – Provision of timber noggings within timber floors

Board thickness

Maximum joist centres

with

noggings

mm

without

noggings

mm

6mm Glasroc F multiboard 450 400

10mm Glasroc F multiboard 600 450

12.5mm Gyproc plasterboard /

Glasroc F multiboard600 450

15mm & 19mm Gyproc plasterboard 600 600

Gyproc ThermaLine laminates 600 450

Perimeternoggingsarerequiredifthefloorisrequiredtoprovidefire

resistance.

Important information

Impactsoundinsulation,Ln,w

isameasurementoftheamountofsoundenergytransmittedthroughthefloorwhentestedunderlaboratoryconditions.Therefore,thelowerthefigure,thebettertheperformance.


C06

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Joist width

Wherethejoistwidthislessthantheminimumstatedintables

1-6b,thesystemmaynotmeetitsspecifiedperformance.

Whereminimumfixingtolerancescannotbemet,e.g.the

inadequatebearingsurfaceaffordedby35mmwidthtrussed

rafters,50mmx25mmtimberbattensshouldbescrew-fixedto

thesideofthejoistswhereceilingboardsabutinordertoextend

thebearingsurface.

Refer to construction detail 7.

Nail popping

Looseningofnailsintimbercanoccurthroughtimbershrinkage,

orasaresultoffixingboardstomisalignedortwistedframing.To

reducetherisks,boardsshouldbefixedtighttoframingmembers

usingBritishGypsumDrywallScrewspenetratingminimum

25mmintothetimber.Alternatively,fixGypframeRB1Resilient

BarorGypframeRB2SureFixBartotheundersideoftimberjoists

toprovideapositivegroundforscrew-fixingtheceilinglinings.

Intestswherejoistswarpedandtwistedunderdryingshrinkage,

GypframeRB1ResilientBarandGypframeRB2SureFixBarwere

successfulinprovidingasoundbaseforplasterboardfixing,

resultinginnofixingdefects.GypframeRB1ResilientBarand

GypframeRB2SureFixBaralsocontributetothesoundinsulation

ofatimberjoistfloor.

Loadbearing timber joist floors design (continued)

Important information

Timbernoggingsarealwaysrequiredaroundtheceilingperimeter,exceptwhenusing15mmGyprocWallBoardand19mmGyprocPlankinnonfire-ratedsituations.Inmulti-layerplasterboardceilings,theprovisionfornoggingsrelatestotheouterlayerboardonly(unlessotherwisestated).

Fixing to super-dried timber and engineered timber ‘I’ beams

TestresultsshowthatBritishGypsumDrywallScrewsarethe

preferredsolutionforfixingtostandardsoftwood,super-dried

timber(approximately12%moisturecontent)andengineered

timber‘I’beams.Whenengineeredtimber‘I’beamsortimber

joistsareusedinconjunctionwithGypWallmetalframedpartition

systems,thecontractormaywishtouseBritishGypsumDrywall

Screwsforbothapplications(similarlengthsareavailable).

Existing lath and plaster ceilings

Acoustically,lathandplasterprovidessimilarperformanceto

2layersof15mmGyprocSoundBlocorinnerlayer19mm

GyprocPlankandouterlayer12.5mmGyprocSoundBloc.Inthe

eventoffireitiscriticalthatthelathandplasterremaininplace.

Duetotheirvariablenature,itisnotpossibletoprovideafire

resistance.

Inordertoensuretherequiredfireresistanceofafloorisachieved,

itisrecommendedtounder-drawthelathandplasterwithchicken

wire(fixedinaccordancewithmanufacturerrecommendations).

Acavityshouldthenbeformedwithminimum38x38mmtimber

battensorGypLyner universal.

Services

Theinstallationofelectricalservicesshouldbecarriedoutin

accordancewith BS 7671.Electricalandothersmallserviceruns

canberoutedwithinthefloorcavity.Concealedcablesmayneed

earthedmetalliccovering,ortobeenclosedinearthedconduit,

trunking,orductingtosatisfyBS 7671.

Fixtures

Fixturesshouldbemadeintojoists,ortosupplementarytimber.

CaremustbetakennottobridgeGypframeRB1ResilientBaror

GypframeRB2SureFixBar.

Board finish

Refer to C08. S01. P02 – Finishes.

For more information, visit timber-frame.org


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Loadbearing timber joist floors construction details

1

1 Gyproc plasterboard

2 Timber joist

3 Timber noggings to provide support at the perimeter

4 Timber noggings to provide support board edges

1

2

3

2

Reflectedceilingplan-singlelayer.12.5mmplasterboardwithjoistsatmaximum600mmcentres

Reflectedceilingplan-singlelayer.12.5mmplasterboardwithjoistsatmaximum450mmcentres

(or15mmplasterboardwithjoistsatmaximum600mmcentres)

1

4

3

2

RefertoC06.S06.P12-table7fortheprovisionoftimbernoggings.


C06

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Loadbearing timber joist floors construction details (continued)

1

2

3

3

4

Reflectedceilingplansinglelayer-12.5mmGyprocHandiBoardwithjoistsatmaximum610mmcentres

Reflectedceilingplandoublelayer-12.5mmplasterboardwithjoistsatmaximum450mmcentres

(noggingsmayberequiredtosupportlongedgesofboardofouterlayeriffire-rated)


2 Timber joist

3 Noggings to provide support at the perimeter

4 Noggings to provide support board edges

5 Gyproc HandiBoard

5

4

3

2

RefertoC06.S06.P12-table7fortheprovisionoftimbernoggings.


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35mm 25mm


2 Timber joist

3 Gypframe RB2 SureFix Bar

4 Gypframe RB2 SureFix Bar noggings at perimeter

5 GypWall classic

6 Timber batten (50 x 25mm)

Loadbearing timber joist floors construction details (continued)

5

6

PartitionheadfixingtoceilingwithGypframeRB2SureFixBar

Reflectedceilingplansinglelayer-12.5mmplasterboardwithGypframeRB2SureFixBarsatmaximum450mmcentres

4

3

1

2

1

6

Increasingbearingsurfaceoftimberraftersandjoists

7

2

2

1

5

3


C06

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Gypframe metal components ( Refer to C10. S02. P02 for details)

Gypframe RB1 Resilient Bar

Acousticallyengineeredchanneltoseparateboard

fixingfromtimberjoistandtoovercomenail

popping.Fixedtoundersideofjoists.

Gypframe RB2 SureFix Bar

Acousticallyengineeredchanneltoseparateboard

fixingfromtimberjoistandtoovercomenail

popping.Fixedtoundersideofjoists.

Board products ( Refer to C10. S03. P02 for details)

Gyproc WallBoard1

Standardgypsumplasterboard.Gyproc FireLine1

Gypsumplasterboardwithfireresistantadditives.

Gyproc Moisture Resistant

Gypsumplasterboardwithmoistureresistant

additivesinthecoreandspecialgreenliningpaper

foreasyrecognition.Toreceivetapeandjointfinish.

Glasroc F multiboard

Non-combustibleglass-reinforcedgypsumboard.

Gyproc Plank

Standardgypsumplasterboardlocatedasan

innerlayer.

Glasroc F firecase

Non-combustibleglass-reinforcedgypsumboard.

Gyproc SoundBloc1

Gypsumplasterboardwithahighdensitycorefor

enhancedsoundinsulationperformance.

Fixing products ( Refer to C10. S04. P02 for details)

British Gypsum Drywall Screws

Corrosionresistantself-tappingsteelscrews

forfixingboard-to-timberandboard-to-metal

framinglessthan0.8mmthick.

Glasroc F firecase ScrewsCorrosionresistantself-tappingsteelscrewswithuniqueheaddesignthatcountersinksitselfforfixingGlasrocFfirecaseboardstotimberjoistsat150mmcentres.

British Gypsum Collated Drywall Screws

Corrosionresistantself-tappingsteelscrews

forfixingboard-to-timberandboard-to-metal

framinglessthan0.8mmthick.

Loadbearing timber joist floors components

1 AlsoavailableinaMoistureResistant(MR)version,MRboardsarespecified

tointermittentwetuseareas.


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Plasterboard accessories ( Refer to C10. S05. P02 for details)

Gyproc Jointing Material

Jointingcompounds,readymixesandadhesives

forreinforcementandfinishingofboardjoints.

Primersandsealersfortreatmentofboardsfor

pre-decoration.

Gyproc Sealant

Usedtosealairpathsforoptimumsound

insulation.

Gyproc edge and angle beads

Protectingandenhancingboardedgesandcorners

Gyproc Joint Tape

Apapertapedesignedforreinforcementofflat

jointsorinternalangles.

Finishing products ( Refer to C10. S06. P02 for details)

Thistle MultiFinish

Toprovideaplasterskimfinishonmostcommon

backgroundsincludingundercoatplastersand

plasterboard.

ThistlePro PureFinish

Toprovideaplasterskimfinishwith

ACTIVairtechnology.Usedtofinishmost

commonbackgroundsincludingundercoat

plastersandplasterboard.Formoreinformation

refertoC02.S01.P49.

Thistle BoardFinish

ToprovideaplasterskimfinishtoGyproc

plasterboards.

Plaster accessories

Designedforthereinforcementandfinishingof

boardjointsbeforeplasterskimming.

Thistle ProTape FT50

Self-adhesive48mmwideglassfibremeshtape.

Thistle ProTape FT100

Self-adhesive100mmwideglassfibremeshtape.

Insulation products ( Refer to C10. S09. P02 for details)

Isover Spacesaver Ready-Cut

Glassmineralwoolforenhancedacousticand

thermalperformance.

Isover Acoustic Partition Roll (APR 1200)

Glassmineralwoolforenhancedthermal

performance.

Isover Sound Deadening Floor Slab

Glassmineralwoolforenhancedacoustic

performance.

Stone Mineral Wool

(22kg/m3, 24kg/m3 and 45kg/m3, by others)

Loadbearing timber joist floors components (continued)


C06

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Loadbearing timber joist floors installation overview

Additional information

Forfullinstallationdetails,refertotheBritish Gypsum Site Book,availabletodownloadfrombritish-gypsum.com

Thisisintendedtobeabasicdescriptionofhowthesystemisbuilt.

FordetailedinstallationguidancerefertotheBritish GypsumSite Book.

Alternatively,GypframeRB1ResilientBarsor

GypframeRB2SureFixBarsarefixed

throughthesinglefixingflangetothe

undersideoftimberjoists(at90˚tothem)

usingBritishGypsumDrywallScrews.The

firstandlastrowsofGypframeRB1Resilient

BarsorGypframeRB2SureFixBarsare

locatedatallwallperimeters.

Wherebarsarenotlongenoughtospanthe

ceiling,endsarebuttedtogetherdirectly

underajoistandscrew-fixedthroughthe

flangeofbothends.

Gyprocplasterboardsarefixedtothe

undersideofGypframeRB1ResilientBarsor

GypframeRB2SureFixBarswithBritish

GypsumDrywallScrews.

Whenfixingboards,caremustbetakento

ensurethattheplasterboardfixingscrews

donotmakecontactwiththejoists.

Gyprocplasterboardscanbefixeddirectly

totheundersideoftimberjoists.Timber

noggingsarefitted,whererequired,

betweenjoistsatroomperimetersto

supportboardedges.Noggingsmayalso

berequiredtosupportboardedgesinthe

fieldoftheboards.Plasterboardsarefixed

totimbersupportsusingBritishGypsum

DrywallScrews.

Documents

C06. S06. P02 – P20 Loadbearing timber joist floors