Gable Restraint System
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
Gable Panel
225mm maximum height between underside of wallplate and horizontal restraint strap
Insulation continued into gable panel
Breather membrane to face of gable panel
Roof insulation
Cullen FT Timber frame wall ties
Longitudinal truss bracing
Continuous wallplate 38mm min-75mm maximum depth
Level of truss wallplate
Solid blocking between truss and gable panel at horizontal restraint strap positions Gable panel to wallplate fixing - Paslode 3.1mm dia x min 75mm long smooth shank nails at maximum 175mm centres Vertical holding down strap plugged and screwed to blockwork
Mortar bed
Cullen RST-3 restraint straps at maximum 1200mm centre fixed to longitudinal truss bracing /
Cullen Gable Restraint Bracket (GRB) at maximum 1200mm centres
additional longitudinal bracing with 8 no. 4 x 25mm steel screws fixed to gable panel stud with 3 no. 3.4 x 35 mm square twist nails
Cavity insulation shown for indicative purposes only - thermal bridging and SAP calculations are plot specific Cavity trays and firestops to be detailed by building designer
at maximum 1.8m centres, Cullen VRS-900-100 strap
Gable Panel (without gable ladder)
Cullen PFS restraint straps fixed to solid timber noggins between trusses at maximum 2000mm centres with 3.4 x 35mm square twist nails, 8 no. to noggins and 4 no. to gable panel (2 no. top face & 2 no. cavity face)
Cullen RST-3 restraint straps at maximum 1200mm centres fixed to additional longitudinal bracing with 8 no. 4 x 25mm steel screws fixed to gable panel stud with 3 no. 3.4 x 35mm square twist nails
Gable Panel (with or without gable ladder)
Truss profile
Bottom rail of gable panel
Continuous wallplate 38mm min-75mm maximum depth
1200mm max
Mortar bed
1200mm max
1200mm max
1200mm max
Cullen Gable Restraint Bracket (GRB) at maximum 1200mm centres
Cullen VRS-900-100 fixed to top of bottom rail with 4 no. 3.4 x 35mm square twist nails
1800mm maximum
Vertical restraint strap plugged and screwed to blockwork at maximum 1.8m centres - Cullen VRS-900-100 installed to top of gable panel bottom rail
The latest version of the technical guide will always be the digital format on our website.
Technical support: 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk 4
Made with FlippingBook interactive PDF creator