5 fire protection - sgi malta fire protection.pdf · lafarge when deciding on appropriate methods...

FIRE PROTECTION 5

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Fire protection fromLafargeWhen deciding on appropriatemethods of fire protection, thespecifier needs to be absolutely surethat the systems selected are bothreliable and totally effective. Theseare the most important designconsiderations, as lives andlivelihoods are at stake, and it isimperative to make the rightdecisions. Not only are LafargeCormet fire protection systemsreliable and effective, they are moreeconomic and practical to install on-site than alternative constructions.

Lafarge offer a full range of passivefire protection products, fromcompartment walls to specialsystems for encasing beams andenclosing shafts. Lafarge systemshave been exhaustively tested byindependent test houses, tried andrefined over many years to satisfy arange of regulatory standards.

Fire testing

All Lafarge Plasterboard systems aretested at one of the following:

• Building Research Establishment

• Timber Research andDevelopment Association

• Warrington Fire Research

• Aycliffe Fire Testing Facility

This means that installers andspecifiers can be absolutely sure thatLafarge Cormet fire protectionsystems are tested in accordancewith BS 476: Part 21: 1987 or BS 476: Part 22: 1987 as appropriateby the UK’s leading independentaccredited test houses, so there is a100% guarantee that systems work,when installed to Lafargespecification.

Details on Lafarge Plasterboard SteelProtection systems are also listed inthe ASFP (Association for SpecialistFire Protection) Yellow Book.NB: The data shown in the tables under fireresistance has been tested to BS 476: Part 21: 1987 (Beams and Columns),BS 476: Part 22: 1987 (Shaft Walls)

Cormet Shaftwall

Cormet Shaftwall is a fire protectionsystem providing up to 120 minutesfire resistance for shafts in multi-storey buildings, including lift shafts,stairwells, service ducts and plantrooms.

It is erected from one side only. Thisfeature also makes it ideally suitedfor lining and dividing largeindustrial or warehouse spaces andmeeting Building Regulations fireresistance requirements where suchpremises are within 1 metre of anadjacent property.

Cormet Shaftwall is light inconstruction and is ideal for fasttrack construction programmes.

Cormet Column and Beam ClipSystem

In a fire, unprotected structural steelbegins to lose its strength attemperatures above 550ºC. Selectionof a suitable encasement system isessential. The factors which affectthis selection are:

• the period of fire protectionrequired

• the physical properties (size andmass) of the steel section

• the application – column or beamand the number of exposed faces,2, 3 or 4.

The degree of fire protectionrequired for a steel section has beenshown to depend on its Hp/A factor,which is a function of the heatedperimeter of the section related toits cross sectional area. A sectionwith a high Hp/A factor will heat upmore rapidly than one with a lowHp/A factor, and so may require ahigher specification of encasementto achieve the same level of fireprotection.

To select the optimum encasementsolution:

1. Identify the period of protectionrequired.

2. Confirm the number of sides tobe protected.

3. If the protection factor of thecolumn, beam or joist is notknown, consult tables 5.6 to 5.8to identify the Hp/A.

4. Decide on the appropriateCormet fire protection system,details of which are given in thissection, tables 5.1 to 5.5 and 5.9.

5. Choose thickness of materialsfrom Hp/A tables for eachLafarge system

6. Design details.

F I R E P R O T E C T I O NINTRODUCTION

ContentsPerformance tables 219

Cormet Shaftwall 227

Cormet Column and Beam Clip System 237

What Can Go Wrong Checklist 246

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F I R E P R O T E C T I O NCORMET

219

5

Performance tables

RCS 106

RCS 203

Wei

ght

(kg/

m2 )

Max

imum

hei

ght*

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6

Soun

d in

sula

tion

(dB)

Rw

Studs: 60mm wide Cormet CHS60/B Studs at 600mm centres

Boarding: Inner; 25mm Lafarge Firecheck CoreboardOuter; one layer 15mm Lafarge Firecheck wallboard or 15mmLafarge Megadeco wallboard



Insulation: 25mm glass mineral wool density 16 kg/m3



RCS 208 Studs: 90mm wide Cormet CHS90/B Studs at 600mm centres



Table 5.1 Cormet Shaftwall: 60 minutes fire protection systems

36 4.2 78 60 45

35 4.2 78 60 39

36 6.0 107 60 43

37 6.0 107 60 51

System reference Specification

RCS 102

RCS 310 Studs: 146mm wide Cormet CHS146/B Studs at 600mmcentres





37 6.8 161 60 43

38 6.8 161 60 51

* Based on stiffness measurements to BS 5234: Part 2. These will be affected by deflection and air pressure criteria. Refer to table 5.11, page 231.

Note: Rock mineral wool density 40 kg/m3 may be used in lieu of glass mineral wool as specified.

The Deco system is not suitable for plastering. Refer to Section 7 for finishing details.

The values shown above are for imperforate systems utilising taper edge plasterboard with all joints taped and filled and systems installed in accordance withthe recommendations of Lafarge Plasterboard Ltd. The quoted performance can only be achieved by the use of Lafarge components throughout. Any variationshould be referred to the Lafarge Technical Enquiryline for confirmation of acceptance.

220

F I R E P R O T E C T I O N


Wei

ght

(kg/

m2 )

Max

imum

hei

ght*

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6

RCS 104

RCS 205


Boarding: Inner 25mm Lafarge Firecheck Coreboard, outertwo layers 12.5mm Lafarge Firecheck wallboard or 12.5mmLafarge Megadeco wallboard




Studs: 90mm wide Cormet CHS90/B Studs at 600mmcentres

Boarding: Inner 25mm Lafarge Firecheck Coreboard,outer two layers 12.5mm Lafarge Firecheck wallboard or12.5mm Lafarge Megadeco wallboard




43 4.4 88 90 46

42 4.4 88 90 40

43 6.4 118 90 45

44 6.4 118 90 52


RCS 103



47 7.5 175 90 50




47 7.5 175 90 52


Soun

d in

sula

tion

(dB)

Rw

Performance tables







221

5

Performance tables

Wei

ght

(kg/

m2 )

Max

imum

hei

ght*

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6

Soun

d in

sula

tion

(dB)

Rw

RCS 110

RCS 206


Boarding: Inner 25mm Lafarge Firecheck Coreboard, outertwo layers 15mm Lafarge Firecheck wallboard or 15mmLafarge Megadeco wallboard









46 4.8 95 120 47

45 4.8 95 120 41

47 6.7 120 120 47

48 6.7 120 120 54


RCS 109



51 8.0 180 120 51




52 8.0 180 120 54






222



Performance tables

Wei

ght

(kg/

m2 )

Max

imum

hei

ght*

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6

Soun

d in

sula

tion

(dB)

Rw

RCS 904

RCS 905







47 3.6 123 90 47

42 2.5 95 90 41

51 4.2 180 90 51


RCS 901

Cormet Shaftwall may be installedhorizontally to provide an economical fireprotection system for ducts, corridors andother ceilings and stairway soffits. 60, 90and 120 minute fire protection can beprovided.

Such systems are not designed to carry liveloads or mechanical equipment, nor toprovide material storage areas.

Provision and sighting of warning noticesshould be considered.

Horizontal metal ducts require additionalprotection for fire from either inside oroutside the ducts. Refer to table 5.4 above.

The adjacent diagrams show typicalinstallation details for Cormet HorizontalMetal Duct Systems.

Cross section through horizontalmetal duct enclosure – 90 minute

Table 5.4 Cormet Shaftwall: horizontal metal duct enclosure


Note: For 120 minutes fire resistance add 1 x 15mm Lafarge Firecheck wallboard and Cormet Ceiling Channels MFCC50 at 400mm centres to the systems shown



Maximum size dependson screw fixing andframing capacity

Duct surface

LafargeIntumescentAcoustic Sealant

Cormet CH Studsat 600mm centres

Cormet J Track

Cormet MFCC50 Ceiling Channels at400mm centres as fixing for boards

Cross section through horizontalmetal duct enclosure – 120 minute

Lafarge IntumescentAcoustic Sealant

15mm LafargeFirecheck wallboard

Horizontal Shaftwall assemblies


15mm LafargeFirecheck wallboard

25mm LafargeFirecheckCoreboard

CormetMFCE26 EdgeChannel


Cormet J Track

Maximum size dependson screw fixing and

framing capacity

Duct surface



CormetMFCE26 EdgeChannel



223

5

Performance tables

Wei

ght

(kg/

m2 )

Max

imum

hei

ght*

(m)

Nom

inal

thi

ckne

ss (m

m)

Fire

res

ista

nce

(min

utes

)

to B

S 47

6 an

d BS

EN13

64So

und

insu

lati

on (d

B) R

w

RCS 504

RCS 505


Core: 25mm Lafarge Firecheck Coreboard

Boarding: One layer 12.5mm Lafarge Firecheck orMegadeco wallboard both sides



Boarding: One layer 12.5mm Lafarge Firecheck orMegadeco wallboard both sides

Insulation: minimum 25mm glass mineral wool density16 kg/m3



Boarding: Inner 12.5mm Lafarge Firecheck or Megadecowallboard, outer two layers 12.5mm Lafarge Firecheck orMegadeco wallboard

43 4.5 88 120 44

90

42 4.5 88 120 40

90

54 5.4 101 120 43

120


RCS 503

Table 5.5 Cormet Shaftwall: stairwell systems





224

F I R E P R O T E C T I O NCORMET COLUMN AND BEAM CLIP SYSTEM


Performance tables

Table 5.6 Section factor Hp/A for Universalbeams with box encasement

Size of Mass per Section factorsteelwork metre Hp/A

(mm) (kg) 3 sides m-1 4 sides m-1

914 x 419 388 45 55

343 50 60

914 x 305 289 60 65

253 65 75

224 75 85

201 80 95

838 x 292 226 70 80

194 80 90

176 90 100

762 x 267 197 70 85

173 80 95

147 95 110

686 x 254 170 75 90

152 85 95

140 90 105

125 100 115

610 x 305 238 50 60

179 70 80

149 80 95

610 x 229 140 80 95

125 90 105

113 100 115

101 110 130

533 x 210 122 85 95

109 95 110

101 100 115

92 110 125

82 120 140

457 x 191 98 90 105

89 100 115

82 105 125

74 115 135

67 130 150

457 x 152 82 105 120

74 115 130

67 125 145

60 140 160

52 160 180

406 x 178 74 105 125

67 115 140

60 130 155

54 145 170

406 x 140 46 160 185

39 190 220

356 x 171 67 105 125

57 125 145

51 135 165

45 155 185

356 x 127 39 170 195

33 195 225

305 x 165 54 115 140

46 130 160

40 150 180

305 x 127 48 125 145

42 140 160

37 155 180

305 x 102 33 175 200

28 200 225

25 225 260

254 x 146 37 140 170

31 160 200

254 x 102 28 170 200

25 190 220

22 215 250

203 x 133 30 145 180

25 165 210

203 x 102 23 175 210

172 x 102 19 190 230

152 x 89 16 190 235

127 x 76 13 195 240

Table 5.7 Section factor Hp/A for Universalcolumns with box encasement



356 x 406 634 15 20

551 20 25

467 20 30

393 25 35

340 30 35

287 30 45

235 40 50

202 45 60

356 x 368 177 50 65

153 55 75

129 65 90

305 x 305 283 30 40

240 35 45

198 40 50

158 50 65

137 55 70

118 60 85

97 75 100

254 x 254 167 40 50

132 50 65

107 60 75

89 70 90

73 80 110

203 x 203 86 60 80

71 70 95

60 80 110

52 95 125

46 105 140

152 x 152 37 100 135

30 120 160

23 155 205

Table 5.8 Section factor Hp/A for steel joistswith box encasement



254 x 203 81.85 70 90

254 x 114 37.20 130 155

203 x 152 52.09 85 105

152 x 127 37.20 90 120

127 x 114 29.76 100 130

127 x 114 26.79 110 140

114 x 114 26.79 100 135

102 x 102 23.07 105 140

89 x 89 19.35 105 145

76 x 76 12.65 140 185

The higher the Hp/A the higher the degree ofprotection required.

For sections not included on this page, refer tothe Association for Specialist Fire Protection(ASFP) Yellow book or go to www. asfp.org.ukor contact Lafarge Technical Enquiryline office.



225

5

Performance tables

To calculate the thickness of LafargeFirecheck, Lafarge Megadeco orLafarge Firecheck Coreboardnecessary, calculate the Hp/A for thesteel to be protected, refer to tables5.6 to 5.8 opposite, and use thecharts below to look up theappropriate thickness of Lafargewallboard and the Cormet systemthat provides the suitable level offire protection required.

Refer to table 5.9 on page 226 forsystem details.

20

40

60

80

100

120

140

160

180

200

220

240

260

280

30 60 90 120 180

Fire resistance (minutes)

Sect

ion

fac

tor

Hp

/A (

m-1

)

20

40

60

80

100

120

140

160

180

200

220

240

260

280

30 60 90 120 180

Fire resistance (minutes)

Sect

ion

fac

tor

Hp

/A (

m-1

)

12.5RCE01

12.5RCE01

30RCE05

25RCE03

40RCE06

50RCE07

40RCE06

25RCE03

15RCE02

12.5RCE01

12.5RCE01

30RCE05

25RCE03

40RCE06

50RCE07

40RCE06

25RCE04

15RCE02

15RCE02

25RCE04

230

185

140

105

130

118

180

50

8575

Lafarge Firecheck, Firecheck Coreboardand Megadeco to columns

Lafarge Firecheck, Firecheck Coreboardand Megadeco to beams


Worked example

Beam that will be encased on 3 sides and requires 60 minute fire rating.

Beam section: 457 x 152mm x 60 kg/m

Calculate Hp/A value: From table 5.6, equals 140 Hp/A m-1 (based on 3 sided encasement)

System selection: From the charts detailed above, the system required is the Lafarge reference RCE01, which is one layer of 12.5mm Lafarge Firecheck or 12.5mm Lafarge Megadeco.

See performance table 5.9 for complete system specification on page 226.

226



Performance tables

RCE 01

RCE 02

Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CB Clipspositioned at 600mm centres

Boarding: one layer 12.5mm LafargeFirecheck wallboard or 12.5mmLafarge Megadeco wallboard, cornersreinforced with Lafarge Tape-On 90ºCorners

Fire resistance: columns

30 minutes up to 280 Hp/A factor


Fire resistance: beams



Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CB Clipspositioned at 600mm centres

Boarding: one layer 15mm LafargeFirecheck wallboard or 15mm LafargeMegadeco wallboard, cornersreinforced with Lafarge Tape-On 90ºCorners






Table 5.9 Cormet Column and Beam Clip System


RCE 03 Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CB Clipspositioned at 600mm centres

Boarding: inner layer 12.5mmLafarge Firecheck wallboard, outerlayer 12.5mm Lafarge Firecheckwallboard or 12.5mm LafargeMegadeco wallboard, cornersreinforced with Lafarge Tape-On 90ºCorners






RCE 05

RCE 06

Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CBClips positioned at 600mm centres

Boarding: inner layer 15mmLafarge Firecheck wallboard, outerlayer 15mm Lafarge Firecheckwallboard or 15mm LafargeMegadeco wallboard, cornersreinforced with Lafarge Tape-On90º Corners





Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CBClips positioned at 600mm centres

Boarding: inner layer 25mmLafarge Firecheck Coreboard, outerlayer 15mm Lafarge Firecheckwallboard or 15mm LafargeMegadeco wallboard, cornersreinforced with Lafarge Tape-On90º Corners








RCE 07 Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CBClips positioned at 600mm centres

Boarding: two layers 25mmLafarge Firecheck Coreboard,corners reinforced with LafargeTape-On 90º Corners





To determine the necessary thicknessof Lafarge Firecheck, LafargeFirecheck Coreboard or LafargeMegadeco, calculate the Hp/A forthe steel to be protected (see tables5.6 to 5.8 on page 220), and use thecharts on the previous page to lookup the appropriate Lafarge systemreference for the level of fireresistance required.

Note: The Deco system is not suitable for plastering. Refer to Section 7 for finishing details.

RCE 04 Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CBClips positioned at 600mm centres

Boarding: one layer 25mm LafargeFirecheck Coreboard, cornersreinforced with Lafarge Tape-On90º Corners





5The Cormet Shaftwall systemprovides up to 120 minutes fireprotection to lift shafts whilst alsoaccommodating high windloadings.

These characteristics also make itideally suited to use in lining anddividing large industrial orwarehouse spaces and meetingBuilding Regulations fireresistance requirements wheresuch premises are within 1 metreof an adjacent property.


F I R E P R O T E C T I O NCORMET SHAFTWALL

227

5

228



Introduction

Cormet ShaftwallCormet Shaftwall is a highperformance fire protection systemfor the enclosure of shafts in multi-storey buildings. These may includestairwells, lift shafts, service ductsand ventilation/air conditioningducts. Cormet Shaftwall can also beused as a high performanceindependent wall lining systemproviding high levels of fireprotection and sound insulation.Erected from one side only fireresistance is provided to both sidesof the lining. Cormet Shaftwall canprovide up to 120 minutes fireresistance in these applications.

Shaftwalls are non-loadbearingassemblies, installed betweenstructural floors and designed toallow erection from outside theshaft, thus removing the need forscaffolding. Their all-dryconstruction makes them faster toerect and much lighter in weightthan masonry construction.

The Cormet Shaftwall systemcomprises a small range ofcomponents, enhancing speed andsimplicity of erection using normaldrywall methods. The assembly alsoprovides a cavity in which servicescan be run.

Cormet Shaftwall has goodstrength, impact resistance andstiffness. Lift shaft walls are subjectto varying positive and negativepressures as lifts ascend anddescend. The Cormet Shaftwallsystem has been shown by tests tohave the ability to withstand thesepressure changes. Using LafargeIntumescent Acoustic Sealant theconstruction resists air pressuresurges of up to 720 N/m2, minimisingwhistling noise and dirtaccumulation in and around liftshafts.

Performance

Refer to performance tables 5.1 to 5.5.

Lafarge plasterboards andcomponents are defined as Class 0 in accordance with National BuildingRegulations 1991 ApprovedDocument B1/2/3/4/5 Fire Safety and Building Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1987 and Euroclass A2.Cormet metal sections and Lafargegypsum based jointing compoundsare non-combustible when tested inaccordance with BS 476: Part 4: 1970 and Euroclass A1.

Cormet E Studat end

CormetCH Stud


CormetJ Track

Facing layers of LafargeFirecheck or LafargeMegadeco wallboardaccording to specificationand fire resistance required(see performance tables)

25mm glassmineral woolwhere required

Room side

Typical Shaftwall construction



229

5

Components

Table 5.10 Metal componentsCormet CH Studs Description Code reference Metal thickness (mm) Lengths (mm)

CHS60/B 0.70 3000, 3600, 4800

CHS90/B 0.70 4800, 6600

CH146/B 0.70 6000, 8000

Cormet E Studs Description Code reference Metal thickness (mm) Lengths (mm)

ES60/B 0.70 3000, 3600, 4800

ES90/B 0.70 4800, 6600

ES146/B 0.70 6000, 8000

Cormet J Tracks Description Code reference Metal thickness (mm) Lengths (mm)

JT62/B 0.70 3000

JT92/B 0.70 3000

JT148/B 0.70 3000

Cormet J Tracks arelightweight steel sectionspositioned at floor and soffitto guide CH Studs.

Cormet CH Studs arelightweight, non- loadbearingsteel sections which areinstalled between core boardsto provide the bearing surfaceto which wallboard is applied.They have 25mm cutouts toaccommodate service runs.

Cormet E studs are lightweightsteel sections used as starterstuds, intersections, dooropenings and end studs.

35

25

60 90 146

25

25

60 90 146

50

25

62 92 148

CormetCH StudCHS60/B



CormetE StudES60/B

CormetE StudES90/B

CormetE StudES146/B

CormetJ TrackJT62/B

CormetJ TrackJT92/B

CormetJ TrackJT148/B

35

230



Application details

System Assembly

Metal frame and Coreboard

In steel frame construction, tracksand studs are installed beforesteelwork is treated with fireprotective coating. Any fireprotective coating on CormetShaftwall components should beremoved before the boards arefixed.

Apply a 6mm bead of LafargeIntumescent Acoustic Sealant alongthe back of the Cormet J Tracks.Position the Cormet J Track on floorand soffit with the long leg on theshaft side. Securely fix Cormet JTracks with suitable fixings at300mm centres.

Cut Cormet E Studs 20mm less thanthe floor to ceiling height and applya 6mm bead of Lafarge IntumescentAcoustic Sealant along the fulllength. Position Cormet E Studs inthe Cormet J Tracks with the narrowflange of the Cormet E Stud facingthe shaft side. Securely fix Cormet EStuds with suitable fixings at300mm centres.

Cut Lafarge Firecheck Coreboard25mm less than floor to ceilingheight. Position the first Coreboardvertically in the Cormet J Track andinside the web of the Cormet EStud, leaving the 25mm gap at thetop of the board.

Cut Cormet CH Studs 9 to 12mm lessthan floor to ceiling height. PositionCormet CH Studs in the Cormet JTrack and fit firmly over the trailingedge of the Coreboard already inposition.

Insert the next Lafarge FirecheckCoreboard into the Cormet CH Stud.Repeat this process until the lastCoreboard is reached.

Place one Cormet E Stud over thetrailing edge of the last Coreboard.Apply a 6mm bead of LafargeIntumescent Acoustic Sealant alongthe full length of the web of theCormet E Stud. Snip the short leg ofthe Cormet J Track and bend flat toallow the board to be inserted.Insert the Coreboard at an angleinto the Cormet CH Stud.

Position Lafarge FirecheckCoreboard and Cormet E Stud in theCormet J Track and securely fixCormet E Studs to the structure withsuitable fixings at 300mm centres.

Bend the leg of the Cormet J Trackback into vertical position.

Vertical section 25

100

25mm gap at top ofCormet stud

25mm LafargeFirecheck Coreboard

Cormet J Track

Shaft sideRoom side


Lafarge Firecheckwallboard as required

Start wall detail


Shaft side

Room side

CormetCH Stud

Cormet JTrack

CormetE Stud

25mm LafargeFirecheck Coreboard

End wall detail

Shaft side

Room sideLafarge IntumescentAcoustic Sealant

Last Firecheck Coreboardand Cormet E Stud beinginserted

Cormet J Track short legsnipped and bent flat toallow board to be inserted


Cormet J Track


At the head, install fire stops of100mm deep Lafarge FirecheckCoreboard in between the verticalCormet Studs. Butt the FirecheckCoreboard tightly against theCormet J Head Track and screw fixthe Coreboard infill through the

100mm infill of 25mmLafarge FirecheckCoreboard to maintainfire protectionperformance

inner layer of Lafarge FirecheckCoreboard and into the Cormet JTrack using Lafarge 57mm SelfTapping Drywall Screws. Apply 6mmbead of Lafarge IntumescentAcoustic Sealant at the junction ofthe Coreboard and Cormet J Track.



231

5

Application details

5

Table 5.11 Limiting height (mm)Lafarge Cormet Allowable Air Pressure N/m2 system system reference* deflection** 240 360 480 720

RCS 102, 106 L/120 5400 4700 4200 3500

L/240 4300 4300 3400 2900

L/360 3700 3200 2900 2500

RCS 103, 104, 109, 110 L/120 6000 4900 4200 3500

L/240 4700 4100 3800 3200

L/360 4100 3800 3200 2800

RCS 203, 208 L/120 6700 5500 4700 3400

L/240 5300 4600 4200 3400

L/360 4600 4000 3700 3200

RCS 205, 206, 210 L/120 6900 6000 5500 4100

L/240 5500 4800 4400 3800

L/360 4800 4100 3800 3300

RCS 302, 303 L/120 8500 7600 5800 4400

L/240 8200 7200 4800 4400

L/360 7300 6400 5200 4100

* Refer to tables 5.1 to 5.5 for specification of systems

** L = partition height in mm

Install full height Cormet E Studsvertically at all corners, walljunctions and door jambs.

Where the floor to ceiling heightexceeds the maximum availableCoreboard length, reinforcehorizontal joints in Coreboard withhorizontal Cormet CH Stud sectionsor using 100mm infill packer pieceof 25mm Lafarge FirecheckCoreboard. Ensure that horizontaljoints occur only within the top andbottom thirds of the wall heights.Stagger joints in adjacent panels.See drawing below.

Limiting heights

See table 5.11.

Plasterboard

For single layer systems installplasterboard with long edgesvertical, from the room side, fixingto studs and tracks with 25mmLafarge Drywall Screws. Spacescrews at 200mm centres at verticaledges of boards and 300mm in thecentre of boards.

Stagger screws 100mm relative tothose in adjacent board.

For double layer systems install thefirst layer as for single layer systems.Apply the second layer over the firstlayer with long edges vertical andjoints staggered. Fix with 41mmLafarge Drywall Screws at the samecentres as the first layer, with screwsstaggered relative to those in thefirst layer.

Overheight Shaftwall – option 1 Elevation of Shaftwall partition over 3m high

Where wall heightexceeds LafargeFirecheck Coreboardheight, reinforce jointswith horizontallengths of Cormet CHStud between verticalstuds.

2/3rdmaximumheight

1/3rdmaximumheight

Noggingsstaggered inadjacentpanels

Overheight Shaftwall – option 2


Where wall heightexceeds LafargeFirecheck Coreboardheight, reinforce jointswith horizontallengths of 100 x 25mmLafarge FirecheckCoreboard fixed with44mm Lafarge DrywallLaminating Screwsbetween vertical studs.


232



Application details

Corners

Inside

Ensure continuity of Lafarge FirecheckCoreboard by securing a cut lengthof Lafarge Firecheck Coreboard toouter web of the Cormet E Stud.

Outside

Position Cormet E Studs at rightangles to each other. Insert LafargeFirecheck Coreboards, then secureCormet E Studs together with 25mmLafarge Self Drilling Drywall Screwsat 600mm centres.

Wall junction

Reinforce outer plasterboardsabutment with Cormet Metal Angle.

Ensure that a Cormet CH Studcoincides with the junction. Screwfix Cormet E Stud to Cormet CHStud at 600mm centres usingLafarge Drywall Screws.

Inside corner

Outside corner

Lafarge Firecheck Coreboard fixedto outside of Cormet E Stud

Cormet E Studs fixedtogether to support corner

Lafarge Firecheckwallboards

Lafarge FirecheckCoreboard

Cormet E Studsfixed togetherto supportcorner

Lafarge Firecheck wallboard

Wall junction, room side

Wall junction, shaft side

Lafarge Firecheck Coreboard

LafargeFirecheckwallboards

CormetE Stud

CormetCH Stud


CormetE Stud


CormetCH Stud




233

5

Application details

Duct penetrations

Where Cormet Shaftwall ispenetrated by ducts, maintain thefire integrity of the Shaftwall withcut strips of 25mm Lafarge FirecheckCoreboard. Use Cormet J Track tosupport the framing as required.

The duct must be independentlysupported so the weight is nottransferred to the Cormet Shaftwallpartition.

Elevation from room sideCormet CH Studs at 600mm centresCormet J Track

Duct opening

Cormet J Trackwith Cormet CHStud insert tosupport framing

Metal sectionsjointed with panhead screws onboth sides Cormet J Track

Duct penetration section Duct penetration plan

LafargeFirecheckCoreboard

Shaft side Room side

Duct or serviceopening

CormetJ Track

CormetCH Stud


Exploded detail of wall at duct penetration

Shaft side

Room side


Duct or service opening

Cormet J Track

Cormet CH Stud


Cormet J TrackCormet CH Stud

Ductedge

234



Application details

Junctions with structural steelwork

Care should be taken to ensure thatthe fire integrity of the CormetShaftwall is maintained at junctionswith structural steelwork.

Corner column bypass


CormetE Stud

Cormet E Stud

Cormet CB clip

Lafarge Firecheck wallboards

Column bypass


CormetE Stud

CormetE Stud

CormetCB clip

Lafarge Firecheck wallboards

Steel beam, offset wall Steel beam

CormetEdgeChannel

CormetCB clip

CormetJ Track



Cormet E Studfixed toCormet EdgeChannel

Cormet EdgeChannel

CormetCB clip

Cormet E Studfixed to CormetFixing Channel orCormet Flat Strap



Cormet FixingChannel orCormet FlatStrap fixed toCormet EdgeChannel at600mm verticalcentres

LafargeFirecheckCoreboard

CormetEdgeChannel

CormetEdgeChannel



235

5

Application details

Movement control joint

Movement control joints arerequired at 10 metre intervals orwhere the assembly abuts or crossesa structural movement joint.

At movement joints leave a 12.5mmgap in the Cormet Shaftwall, andcap each end of Lafarge FirecheckCoreboard with a Cormet E Stud.Apply Lafarge Intumescent AcousticSealant in the gap between the Cormet E Studs. Attach CormetMovement Control Joint to theouter layer of plasterboard with13mm stainless steel staples at150mm centres.

Corridor ceilings and stair soffits

At abutments with metal studpartitions, secure Cormet J Trackthrough plasterboards and intometal studs using Lafarge DrywallScrews at 600mm centres.

At abutments with masonry secure Cormet J Track with suitable fixingsat 300mm centres.

Stairwells

For stairwells or other areas where aflush jointed finish is required onthe shaft side, one layer ofplasterboard can be transferredfrom the room side to the shaft side– see table 5.5. Apply this layer overLafarge Firecheck Coreboard, screw-fixing to the exposed flanges of theCormet CH Studs.

Movement control joint (plan)

Rock mineralwool Insulation



Cormet E Studs

Cormet MovementControl Joint

Lift door jamb (plan)

Cormet E Studs spot-welded to lift door frameat 300mm centres

25mm Lafarge Firecheck Coreboard

Lining continuedaround Cormet E Studs

120 minute fire resistant ceilingand partition junction detail(vertical section)

Cormet120 minutefire ratedpartition

Corridorceiling void


Two layers 15mmLafarge Firecheckwallboard

Cormet FixingChannel or CormetFlat Strap

Stairwell wall detail (plan)

Cormet E StudsLafarge Firecheckwallboard


Lafarge Firecheckwallboard

Stairwell

Room side


Cormet E Stud





Lift shaft door head(framing only)

Cormet E Studs


Lafarge Wafer HeadSelf Drilling Screws

Cormet J Track(deep leg to front)

236



Specification clauses

Cormet Shaftwall System

Scope

A non-loadbearing, highperformance fire protection systemfor the enclosure of shafts in multi-storey buildings where access canonly be gained from one side. Thesemay include stairwells, lift shafts,service ducts and ventilation/airconditioning ducts. The system canalso be used as independent walllinings where a high degree of fireresistance is a requirement.

The selection of studs and the type,number and thickness ofplasterboard layers will depend onthe partition height and theperformance required for fireresistance and sound insulation. Allframing components comprise ofhot dipped galvanised steel to BS EN10143:1993 and BS EN 10142: 1990.

Additional Clauses

Add general clauses if required for:

– Expansion/movement joints

– Health and safety

– Storage of Materials

– Site conditions and workmanship

NBS clauses

When using the NBS Specification,use clause K10 PLASTERBOARD DRYLININGS/PARTITIONS/CEILINGS.

The Lafarge Plasterboard websitecontains a full set of NBS clauses,completed for each LafargePlasterboard system. See:www.lafargeplasterboard.co.uk/nbssearch/index.asp

System reference (Insert Lafarge system reference from the Performance tables)

Location ........................

Client reference ........................

PerformanceMaximum height ...........m

Fire rating ..........mins (Insert information from Lafarge system reference)

Airborne insulation ..........dB (Insert information from Lafarge system reference)

Thickness ..........mm (Insert information from Lafarge system reference)

Damp proof courseInstall ..... mm wide damp proof course ..... by .....

Floor and head tracksCormet J Track, reference (JT62/B, JT92/B or JT148/B) to BS 7364: 1990, fixed at maximum 300mm centres to substrate using proprietary fixings.

StudsCormet CH Studs, reference (CHS62/B, CHS92/B or CHS148/B) to BS 7364:1990,at ......mm centres.

End studsCormet E Studs, reference (ES62/B, ES92/B or ES148/B) to BS 7364: 1990, fixedat maximum 300mm centres to abutments using suitable proprietary fixings.

Support to horizontal jointsCormet MFIX Channel fixed to faces of studs to support boards alonghorizontal joints in [outer layer of] boards.

NoggingsCut lengths of Cormet CH Stud, reference (CHS62/B, CHS92/B or CHS148/B)to fit between vertical studs at horizontal joints between Coreboards. Stagger noggings between adjacent panels.

InsulationFit ...... mineral wool insulation by ......, thickness ......mm.

BoardingCore board of Lafarge Coreboard, 25mm thick.

Boarding to room side of framework:

Inner layer Lafarge Firecheck wallboard, ........mm thick.

Outer layer Lafarge (Firecheck wallboard, Megadeco), ........mm thick. Allboard joints to be staggered between layers.

Boarding to stairwell side:

Layer of Lafarge (Firecheck wallboard, Megadeco), 12.5mm thick.

Fixings (repeat for all layers of wallboard as required)Lafarge Drywall Screws at 300mm centres.

Type, Drywall Self Tapping or Megadeco Self Tapping

Length, inner layer (Select from 25, 32, 38, 41, 44, 51, 57, 63, 67, 76)mm

Length, outer layer (Select from 25, 32, 38, 41, 44, 51, 57, 63, 67, 76)mm

FinishingLafarge Taping and jointing system, or

Lafarge Supreme Skim Plaster, or

Lafarge Predeco taping and jointing system

Finished lining toleranceFinished system to comply with tolerances in BS 8212: 1995, section 3.3.

InstallationAll materials unless otherwise indicated shall be supplied by Lafarge Plasterboard Ltd, and shall be installed in accordance with theircurrent literature and in accordance with BS 8212: 1995.

Notes:

Red text lists alternative productspecifications.

(Italic red text within bracketsgives advice on selecting theinformation needed).

The Cormet CB clip EncasementSystem allows drywall techniquesto be used to provide fireprotection up to 180 minutes tostructural steel columns andbeams.

The system is fast and efficient,avoids the need for intumescentpaints and sprays and provides asmooth, flat surface allowing highstandards of decoration to beachieved.

From factories to call centres andprestige public buildings, Lafargeencasement systems provide theeffective, high performancesolution.



237

5

Application details

238



Introduction

Cormet Column and BeamClip systemThe Cormet Column and Beam Clipsystem is a high performance systemproviding fire protection tostructural steel I section columnsand beams. Systems have beentested and shown to provide up to180 minutes fire resistance.

The Cormet Column and Beam Clipsystem has been designed toenhance speed and simplicity ofinstallation using normal drywallmethods. No special installationtechniques are required.

The system features a special clipmanufactured from 0.55mm mildsteel, cold formed and protected bya hot dip galvanised zinc coating.Used with Cormet Metal Angles andChannels this provides a strong, rigidmetal structure to which LafargeFirecheck, Firecheck Coreboard orMegadeco board is applied.

Completed column and beam liningsprovide a strong, impact resistant,smooth surface which accepts mosttypes of decoration and makes thesystem particularly suitable for usein conjunction with plasterboardlined metal stud partitions andceilings. Common materials andfixings allow increased site efficiencyand considerable time saving overtraditional methods.

Performance

Fire resistance

Lafarge plasterboards andcomponents are defined as Class 0 inaccordance with National BuildingRegulations 1991 ApprovedDocument B1/2/3/4/5 Fire Safety andBuilding Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1987. Cormet metalsections and Lafarge gypsum basedjointing compounds are non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1.

Impact resistance

For columns situated in heavy trafficareas, Lafarge Firecheck Coreboardor Lafarge Megadeco can besubstituted for Lafarge Firecheck toprovide a lining which is moreresistant to impact damage.

Typical steel column encasement: double boarded

Typical steel beam encasement: double boarded

Cormet Edge Channel

Cormet CB Clips at600mm centres

Stagger plasterboardjoints between layers by300mm

Cormet Edge Channel

Cormet CB Clips at600mm centres

Stagger plasterboardjoints between layersby 300mm

Cormet Metal Anglefixed to soffit withfixing appropriate tosubstrate, asrecommended by fixingmanufacturer

Cormet Flat Strap

Cormet Flat Strap



239

5

Components

Table 5.12 Metal componentsCormet CB Clip Description Code reference To fit flange size (mm)

CB 17 7-17

CB 27 17-27

CB 40 27-40

Cormet Edge Channel Description Code reference Length (mm)

MFCE 26 3600

Cormet Metal Angle Description Code reference Length (mm)

MFC 2330 3600

Cormet Fixing Channel Description Code reference Length (mm)

MFIX 2400

Cormet Flat Strap Description Code reference Length (mm)

FS50/R 2400

FS90/W 2400

Lafarge Drywall Plasterboard Screw length

Self Tapping Screws Construction thickness (mm) (mm)

Single layer 12.5 25

15 25

25 38

Double layer 12.5 + 12.5 38

15.0 + 15.0 41

15.0 + 25.0 51

25.0 + 25.0 63

Firecheck Description Thickness (mm) Width (mm) Length (mm)

12.5 900 1800

1200 2400, 2700, 3000, 3600

15.0 1200 2400, 2700, 3000

Megadeco Description Thickness (mm) Width (mm) Length (mm)

12.5 1200 2400, 2700, 3000

15.0 1200 2400, 2700, 3000

Firecheck Coreboard Description Thickness (mm) Width (mm) Length (mm)

25 600 3000

Cormet CB clips are lightweightsteel clips friction fitted at theflange of columns and beams toprovide main fixing for edgechannels. Three sizes of CB clipare available to accommodatedifferent column and beam sizes. 17 27

40

Cormet Edge Channels arelightweight steel sections frictionfitted to CB clips to providemetal support and bearingsurfaces for plasterboard.

28

26

19

30

23

Cormet Metal Angles arelightweight steel sectionspositioned at column/beam andsoffit abutments to providefixing surfaces for plasterboard.

The table gives therecommended screw lengths forsingle and double layerplasterboards

A fire resistant, sound and impactresistant pre-sealed plasterboard.

A high strength fire resistantplasterboard with a green dyedliner for identification. It ismoisture resistant and hassquare edges.

A fire resistant plasterboard withone face coloured pink for easeof identification. It is availablewith tapered and square edges.

Galvanised metal channel usedto provide support forplasterboard joints and heavyfixtures 99

6

Galvanised metal flat strap toprovide support for plasterboardjoints. Also provides a fire stop

50 90

240



Application details

Cormet Edge Channel, providing 26mmcavity, pressed into Cormet CB Clips

One layer screw-fixed to Cormet EdgeChannels at 300mm maximum centres

Corners reinforced with LafargeTape-On 90º Corners

Cormet CB clips positioned at 600mmmaximum centres

Cormet Edge Channel pressed into clips

Two layers, joints staggered by 300mmand screw-fixed to Cormet EdgeChannels at 300mm maximum centres


Cormet CB clips positioned at 600mmmaximum centres

Column encasement: single layer

Column encasement: double layer

Cut-away column elevation: double layer

Two layers Firecheck wallboardstaggered and screw fixed to CormetEdge Channels at 300mm maximumcentres

Cormet Edge Channel pressed intoCormet CB Clips

Cormet CB Clips positioned at 600mmcentres


Cormet MFIX Fixing Channel fixedwith Lafarge Wafer Head Screws toCormet Edge Channel on a singleboard system. Cormet Flat Strap(shown) between board layers ondouble board systems.



241

5

Application details

Column encasement: partition abutment

Column encasement: junction with masonry wall

Cormet EdgeChannel pressed intoCormet CB Clips

Corners reinforced withLafarge Tape-On 90º Corners

Cormet CB Clipspositioned at600mm maximumcentres

Cormet C Stud

Two layers screw-fixed toCormet Edge Channels at300mm centres

Cormet Metal Angle

Masonry wall

Two layers Firecheckwallboard screw-fixed toCormet Edge Channels at300mm centres

Cormet CB Clips positionedat 600mm maximum centres

Cormet EdgeChannel pressedinto clips

Corners reinforcedwith Lafarge Tape-On 90º Corners

Cormet C Stud Cormet I Stud

Fixing appropriateto substrate

Cormet MFIX or CormetFlat Strap between boardlayers on double boardedsystems at 600mm verticalcentres fastened to edgechannels with LafargeWafer Head Screws

Lafarge IntumescentAcoustic Sealant Lafarge Intumescent

Acoustic Sealant

242



Application details

Beam encasement: partition abutment

Cormet Edge Channel pressed intoCormet CB Clips


Cormet CB Clips positioned at600mm maximum centres

Cormet U Track

Two layers Firecheck wallboardscrew-fixed to Cormet EdgeChannels at 300mm centres

Cormet Metal Angle fixed to soffitwith fixing appropriate to substrate,as recommended by fixingmanufacturer

Cormet Edge Channel pressedinto Cormet CB Clips

Cormet CB Clips positioned at600mm maximum centres

Cormet Metal Angle fixed to soffitwith fixing appropriate to thesubstrate, as recommended by fixingmanufacturer

Two layers staggered by 300mm andscrew fixed to Cormet Edge Channelsat 230mm centres, or 150mm at cutedgesCorners reinforced with

Lafarge Tape-On 90ºCorners (not shown for clarity)

Cormet MFIX Fixing Channel fixed to Cormet EdgeChannel with Lafarge Wafer Head Screws for singleboard systems. Cormet Flat Strap (shown) betweenboards for double board systems

Cut-away beam elevation: double layer

Lafarge Intumescent AcousticSealant

Cormet MFIX FixingChannel at 600mmcentres fastened toCormet Edge Channelwith Lafarge WaferHead Screws or CormetFlat Strap betweenboard layer on doubleboard systems



243

5

Installation

Metal frame

Fiction-fit Cormet CB Clips to all freeedges of the flanges on the columnor beam, starting at a distance of150mm from the end of thecolumn/beam, spaced at 600mmcentres, and with the long leg of theclip on the inside of the flange.

Install Cormet Edge Channels alongeach of the flange edges by tappingthe short leg of the Cormet EdgeChannel into the Cormet CB Clips.

Where a column/beam abuts a wallor other structure install CormetMetal Angles, positioned with thelong leg hard against thecolumn/beam flange. Fix the shortleg to the structure with suitablefixings at 600mm centres.

For beams up to 300mm deep noreinforcement is required to supportthe plasterboard.

Where any face exceeds 300mm thevertical joints in the plasterboardmust be supported by Cormet FixingChannel (in double boarded systemssupport outer layer only withCormet Flat Strap between boardlayers).

Where any face exceeds 600mmCormet Fixing Channel must beprovided at maximum 600mmcentres and to coincide with boardedges.

Plasterboard

For single layer systems installplasterboard to Cormet FixingChannels or Cormet Metal Anglewith Lafarge Drywall Screws at300mm centres.

For multi layer systems, install thefirst layer as for single layer systems.Apply the further layers over thefirst with joints staggered by 300mmminimum. Fix with Lafarge DrywallScrews at 300mm centres.

Reinforce all external corners withLafarge Tape-On 90º Corners.

Cormet MFIXFixing Channelfixed to MFCE 26or MFC2330 usingLafarge WaferHead Screws

Steelwork 300-600mm deep

300 to600mmdepth

2400mm or to suitboard length andnumber of board layers

Cormet MFIXFixing Channel orCormet Flat StrapFS90/W fixed toMFCE 26 orMFC2330 usingLafarge WaferHead Screws

Steelwork over 600mm deep

Over600mmdeep

600mm

600mm

244



Cormet Column and BeamClip System

Scope

Fire resisting encasements to steelbeams and columns with maximumHp/A factor of 260/m using LafargeFirecheck plasterboards or LafargeMegadeco supported on Cormetlightweight metal framing.

Additional Clauses

Add general clauses if required for:

– Expansion/movement joints

– Health and safety

– Storage of Materials

– Site conditions and workmanship

NBS clauses

When using the NBS Specification,use clause K10 PLASTERBOARD DRYLININGS/PARTITIONS/CEILINGS.

The Lafarge Plasterboard websitecontains a full set of NBS clauses,completed for each LafargePlasterboard system. See:www.lafargeplasterboard.co.uk/nbssearch/index.asp

System reference (Insert Lafarge system reference from the Performance tables)

Location ........................

Client reference ........................

PerformanceFire rating ..........mins (Insert information from Lafarge system reference))

Thickness ..........mm (Insert information from Lafarge system reference)

Metal framing componentsFraming components to be hot dip galvanised steel to BS EN 10143: 1993 andBS EN 10142: 1990 and Approved Document A1: 1995 designated DX51D andZ275 NAO. Sections rolled to BS 2994: 1987.

FramingCormet CB Clips, reference (CB17, CB27, CB40) at 600mm centres along flangeswith Cormet Edge Channel MFCE 26 and Cormet MFC2330 Metal Angles.

Support to lateral board edgesCormet Fixing Channel, reference MFIX or Cormet Flat Strap FS50/R or FS90/W at ..........mm centres (to coincide with lateral board edges).

BoardingSingle or double layer of wallboard.

Inner layer (Specify wallboard from the Performance tables)

Outer layer (Specify wallboard from the Performance tables)

All board joints to be staggered between layers.

FixingsLafarge Drywall Screws at 300mm centres.

Type, Drywall Self Tapping or Megadeco Self Tapping

Length, inner layer (Select from 25, 32, 38, 41, 44, 51, 57, 63, 67, 76)mm

Length, outer layer (Select from 25, 32, 38, 41, 44, 51, 57, 63, 67, 76)mm

FinishingLafarge Taping and jointing system, or

Lafarge Supreme Skim Plaster, or

Lafarge Predeco taping and jointing system.

Corners reinforced with Lafarge Tape-On 90º corners.

Finished lining toleranceFinished system to comply with tolerances in BS 8212: 1995, section 3.3.

InstallationAll materials unless otherwise indicated shall be supplied by Lafarge Plasterboard Ltd, and shall be installed in accordance with theircurrent literature and in accordance with BS 8212: 1995.

Specification clauses

Notes:

Red text lists alternative productspecifications.

(Italic red text within bracketsgives advice on selecting theinformation needed).


F I R E P R O T E C T I O NWHAT CAN GO WRONG CHECKLIST

245

5

Installation

Friction fit all theCormet CB Clips onto the web of thesteel at 600mmmaximum verticalcentres.

Completely install allthe Cormet CB Clipsand Cormet EdgeChannels beforestarting the fixing ofwallboards.

1

2

3

4

5

6

Install the CormetEdge Channel intothe flange of theCormet CB Clips bypushing the small legof the Cormet EdgeChannel into theCormet CB Clips.

For ease ofinstallation, anglethe Cormet EdgeChannel as shown.

Screw fix wallboardsat maximum 300mmcentres through thewallboards and intothe Cormet EdgeChannels usingLafarge Self TappingDrywall Screws.Ensure all wallboardjoints are supportedand install eitherCormet Flat Strap orCormet FixingChannel as required.

Ensure that theCormet EdgeChannels are fullypushed into theCormet CB Clips.

Reinforce the cornerswith Lafarge Tape-On 90º Corners andtape and joint asshown in Section 7.

246



Fire Protection Solutions

Items to check

For Cormet Shaftwall

1. Has Lafarge Intumescent Acoustic Sealant been applied to the back of theCormet J Tracks and E Tracks before fixing in position?

This is required to seal gaps and airpaths against smoke.

2. Have fire stops of 100mm deep Lafarge Firecheck Coreboard beeninserted and screwed in position at the head of the shaftwall?

This is required to close off the shaft side of the partition against fire.

3. Where two layers of plasterboard are used, are the joints staggered?

4. At inside corners has the steel frame been protected by a cut piece ofLafarge Firecheck Coreboard?

This is to maintain the fire performance of the partition.

5. Are movement joints provided at maximum 10m centres?

For Cormet Column and Beam Clip System

1. Are Cormet MFIX Fixing Channels (single layer systems) and Cormet FlatStraps (double layer systems) provided for fixing the plasterboard edges?

These are necessary for the integrity of the system.

2. Are the thickness and layers of plasterboards as specified to meet therequired fire resistance?

Depending on the mass of the steel section being protected, the board thicknesseswill vary even where the same level of fire protection is provided.

Yes No Date completed

(✓ ) (✓ )

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