gable restraint system technical guide · this nhbc accepted “whole system” solution...

Cel

ebra

ting over 40 years

of commi tm

ent

TECHNICAL GUIDEGABLE RESTRAINT SYSTEM

A brand of

NOW UP TO 5 STOREYS

ITW Construction Products’ Cullen brand of timber engineering connectors has been synonymous with innovation and quality for over forty years. In collaboration with national housebuilders, the Trussed Rafter Association and industry partners, ITWs technical experts have created an innovative system featuring the Cullen Gable Restraint Bracket for a complete solution to connect timber gables to masonry walls.

The details have been developed to safely transfer lateral wind load on the masonry and timber gable ends into the braced roof diaphragm. This provides a verified connection between timber gable panels to masonry walls. The details give an option to have a continuous wall plate or a stepped wallplate with the gable wall plate being raised to suit the bottom chord depth of the truss. Either of the details meets the minimum requirement of Building Regulations 2010 approved document A, Scottish Building regulations domestic, NHBC Standards for houses of five storeys or less in England and Wales and four storeys or less in Scotland. Both details are accepted by NHBC.

This NHBC accepted “whole system” solution incorporating the Cullen Gable Restraint Bracket and restraint straps including Paslode nail fixings with all centres, spacings and connections already calculated means that whenever our detail is followed the system is underwritten by ITW Construction Products.

Gable Restraint System

Gable Restraint Bracket Installation

Gable Restraint Bracket & Application

10mm maximum mortar bed on wall prior to wallplate being fixed.

Components:

Patent Pending

Gable restraint brackets placed on wall at 1200mm* maximum centres (no fixings required).

*for buildings up to 3 storey England & Wales and 2 storey Scotland

38-75mm wallplate bedded on mortar and fixed to gable restraint brackets with 3.5x40mm wood screws (2 no. per bracket).

— Wallplate

— Mortar

— Gable Restraint Brackets

— Wall

Gable panel

Timber wallplate

Mortar bed

Masonry wall

Gable restraint bracket

225m

m M

AX

Gable Panel

Breather membrane toface of gable panel

Cullen FT Timber framewall ties

Continuous wallplate38mm min-75mmmaximum depthMortar bed

Cullen Gable RestraintBracket (GRB) atmaximum 1200mmcentres

Cavity insulation shownfor indicative purposesonly - thermal bridgingand SAP calculations tobe plot specific

Solid blocking between truss andgable panel at horizontal restraintstrap positions

Gable Panel to wallplate fixing -Paslode 3.1mm dia x min 75mmlong smooth shank nails atmaximum 175mm centres

Vertical holding down strap pluggedand screwed to blockwork atmaximum 1.8m centresEither VRS-900-100 or PFS-1200-F /LDGS-1200-F

225mm maximum heightbetween underside ofwallplate and horizontalrestraint strap

Roof insulation

Longitudinal truss bracing

Level of truss wallplate

Cullen RST-3 restraint straps at maximum 1200mm centrefixed to longitudinal truss bracing / additional longitudinal bracing with 8no. 4x25mm steel screws fixed to gable panel stud with 3no. 3.4x35mm square twist nails

Insulation continued intogable panel

Vertical restraint strap tobe face fixed to verticalstud with 4no. 3.4x35mmsquare twist nails

Cavity trays and firestopsto be detailed by buildingdesigner

Continuous wallplate38mm min-75mmmaximum depth


Mortar bed

1800mm maximumVertical restraint strap plugged and screwed toblockwork at maximum 1.8m centres either -Cullen VRS-900-100 installed to top of gable panelbottom railorCullen PFS-1200-F / LDGS-1200-F nailed to face of gablepanel vertical studs.

Cullen RST-3 restraint straps at maximum1200mm centresfixed to additional longitudinal bracingwith 8no. 4x25mm steel screwsfixed to gable panel stud with 3no.3.4x35mm square twist nails

or

Bottom rail of gablepanel

Truss profile

Vertical restraint strap to be face fixed to vertical stud with 4no. 3.4x35mm square twist nails

or

Cullen VRS-900-100 fixed to top of bottom rail with 4no. 3.4x35mm square twist nails

Gable Panel (with orwithout gable ladder)

2000m

m max

2000m

m max

2000m

m max

Cullen PFS restraint straps fixed to solid timber nogginsbetween trusses at maximum 2000mm centres with3.4x35mm square twist nails, 8no. to noggins and 4no.to gable panel (2no. top face & 2no. cavity face)

1200mm max

1200mm max 1200mm max 1200mm max

Gable Panel (withoutgable ladder)

2000m

m max

2000m

m max

Class 1 Buildings / houses of single occupancy three storeys or less England & Wales and two storeys or less Scotland

Timber Gable to Masonry fixing detail to cold roofs - Continuous Wallplate


Class 1 Buildings / houses of single occupancy three storeys or less England & Wales and two storeys or less Scotland

Timber Gable to Masonry fixing detail to cold roofs - Raised Gable Wallplate

Gable Panel



Wallplate 38mmmin-75mm maximumdepth

Mortar bed



Cullen PFS-1500-100-Bhorizontal restraint strap


Roof insulation

Longitudinal trussbracing (depth can varyto suit blockwork level)

Level of truss wallplateLevels to be adjusted toensure top of bracinginline with top ofblockwork






Cullen PFS restraintstraps fixed tolongitudinal truss bracing/ additional longitudinalbracing at maximum 2mcentres with 8no.4x25mm steel screws



Cullen PFS restraintstraps bedded in mortarjoint between top ofmasonry and wallplateand fixed to longitudinaltruss bracing maximum2000mm centres with8no. 4x25mm steelscrews

or


or

Cullen VRS-900-100 fixedto top of bottom rail with4no. 3.4x35mm squaretwist nails

Truss profile

2000m

m max

2000m

m max

2000m

m max

1200mm max

2000mm max

2000m

m max

2000m

m max

Gable Panel (with orwithout gable ladder)Cullen PFS restraint straps fixed to solid timber noggins

between trusses at maximum 2000mm centres with 3.4x35mm square twist nails, 8no. to noggins and 4no. to gable panel (2no. top face & 2no. cavity face)

1200mm1 max1200mm1 max




Mortar bed

Class 2a Buildings / houses of single occupancy five storeys or less England & Wales and four storeys or less Scotland

Timber Gable to Masonry fixing detail to cold roofs - Continuous Wallplate

225m

m M

AX

Gable Panel



Continuous wallplate38mm min-75mmmaximum depthMortar bed






225mm maximum heightbetween underside ofwallplate and horizontalrestraint strapInsulation continued intogable panel



Roof insulation

Longitudinal truss bracing


Cullen RST-3 restraint straps at maximum 750mm centresfixed to longitudinal truss bracing / additional longitudinal bracing with 8no. 4x25mm steel screws fixed to gable panel stud with 3no. 3.4x35mm square twist nails



Mortar bed


or

750mm max 750mm max 750mm max 750mm max

800mm max 800mm max 800mm max 800mm max 800mm max

Truss profile

Vertical restraint strap to be face fixed to vertical stud with 4no. 3.4x35mm square twist nails

or

Cullen VRS-900-100 fixed to top of bottom rail with 4no. 3.4x35mm square twist nails

1250m

m max

1250m

m max


Cullen PFS restraint straps fixed to solid timber noggins between trusses at maximum 1250mm centres with 3.4x35mm square twist nails, 8no. to noggins and 4no. to gable panel (2no. top face & 2no. cavity face)

Cullen RST-3 restraint straps at maximum800mm centres fixed to additional longitudinal bracing with 8no. 4x25mm steel screwsfixed to gable panel stud with 3no.3.4x35mm square twist nails

Gable Panel (with orwithout gable ladder)


1250m

m max

1250m

m max

1250m

m max

1250m

m max

1250m

m max

1250m

m max


Class 2a Buildings / houses of single occupancy five storeys or less England & Wales and four storeys or less Scotland

Timber Gable to Masonry fixing detail to cold roofs - Raised Gable Wallplate

Gable Panel



Wallplate 38mmmin-75mm maximumdepth

Mortar bed



Cullen PFS-1500-100-Bhorizontal restraint strap


Roof insulation

Longitudinal trussbracing (depth can varyto suit blockwork level)


Cullen PFS restraintstraps fixed tolongitudinal truss bracing/ additional longitudinalbracing at maximum1.25m centres with 8no.4x25mm steel screws

Levels to be adjusted toensure top of bracinginline with top ofblockwork








Mortar bed


Cullen PFS restraintstraps bedded in mortarjoint between top ofmasonry and wallplateand fixed to longitudinaltruss bracing maximum1250mm centres with8no. 4x25mm steelscrews

or


or

Cullen VRS-900-100 fixedto top of bottom rail with4no. 3.4x35mm squaretwist nails

Truss profile

750mm max 750mm max 750mm max 750mm max

1250mm max1250mm max

1250m

m max

1250m

m max

1250m

m max

1250m

m max

1250mm max

Gable Panel (with orwithout gable ladder)Cullen PFS restraint straps fixed to solid timber noggins

between trusses at maximum 1250mm centres with 3.4x35mm square twist nails, 8no. to noggins and 4no. to gable panel (2no. top face & 2no. cavity face)

1250m

m max

1250m

m max

1250m

m max



Get your technical guidance pack TODAYFor updates in real time follow ITW_CP01592 777570 - option 4

BODMINCooksland Road

Bodmin PL31 2RH

T: 01208 75777

Email: [email protected]

BURY ST EDMUNDSInteg House, Woodlands Business Park

Rougham Ind. Estate

Bury St Edmunds IP30 9DN

T: 01359 271475


CHORLEYWigan Lane, Duxbury

Chorley, Lancashire PR7 4BU

T: 01257 264851


COVENTRYOrchard Court 3, Binley Business Park

Coventry CV3 2TQ

T: 02476 438691


HUDDERSFIELDAccess via Gibbs & Dandy

Manor Mills, Kings Mill Lane

Huddersfield HD1 3AW

T: 01484 544428


Cullen Customer Services:

ITW Construction Products

1 Wheatstone Place

Southfield Industrial Estate

Glenrothes

Fife

KY6 2SW

t : +44 (0)1592 771132

e : [email protected]

Cullen Technical Support:

t : +44 (0)1592 777570

e : [email protected]

www.itwcp-offsite.co.uk

© ITW Construction ProductsNo part of this publication may be reproduced

without prior permission from ITWCP.

A division of ITW Limited

Registered in England and Wales No. 00559693

INVERNESS3 Dalcross Industrial Estate

Inverness IV2 7XB

T: 01667 462102


LEEDSJawbone Industrial Estate, Wood Lane

Rothwell, Leeds LS26 0RS

T: 01133 934977


NEWPORTWestway Road, Alexandra Dock

Newport, Gwent NP20 2WD

T: 01633 243725


OLDBURYUnit 3 Oldbury Park

Popes Lane, Oldbury

Birmingham B69 4RG

T: 01527 879515


PERTHUnit B8, Inveralmond Grove

Inveralmond Industrial Estate

Perth PH1 3UG

T: 01738 447222


REDHILLSalfords Industrial Estate

Salbrook Road, Salfords

Redhill RH1 5GJ

T: 01293 776680


SOUTH SHIELDSSouth Shields Business Works

Henry Robson Way

South Shields NE33 1RF

T: 0191 4274791


STONEY STANTONStation Road

Stoney Stanton

Leicestershire, LE9 4NA

T: 01455 270100


TAUNTONLivingstone Way, Bindon Road

Taunton TA2 6BD

T: 01823 275369


UDDINGSTON9 Grays Road

Green Elms Trading Estate

Uddingston G71 6ET

T: 01698 801560


WATTONNorwich Road Industrial Estate

Watton, Norfolk IP25 6DR

T: 01953 885219


PasquillDistributionNetwork

gable restraint system technical guide · this nhbc accepted “whole system” solution...

Documents