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 Cavity trays and firestops to be detailed by building designer Gable Panel
Breather membrane to face of gable panel
Insulation continued into gable panel
Cullen FT Timber frame wall ties Wallplate 38mm min- 75mm maximum depth
Roof insulation
Longitudinal truss bracing (depth can vary to suit blockwork level)
Mortar bed
Level of truss wallplate
Levels to be adjusted to ensure top of bracing inline with top of blockwork Cullen Gable Restraint Bracket (GRB) at maximum 1200mm centres Cavity insulation shown for indicative purposes only - thermal bridging and SAP calculations to be plot specific
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 at maximum 1.8m centres Cullen VRS-900-100 strap
Cullen PFS-1500-100-B restraint straps at maximum 2000mm centre fixed to longitudinal truss bracing / additional longitudinal bracing with 8no. 4x25mm steel screws fixed to gable panel stud with 3no. 3.4x35mm square twist nails
Gable Panel (with or 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)
Gable Panel (without gable ladder)
Truss profile
Bottom rail of gable panel
Cullen VRS-900-100 fixed to top of bottom rail with 4 no. 3.4 x 35mm square twist nails Cullen PFS restraint straps bedded in mortar joint between top of masonry and wallplate and fixed to longitudinal truss bracing maximum 2000mm centres with 8 no. 4 x 25mm steel screws
Continuous wallplate 38mm min-75mm maximum depth
2000mm max
Mortar bed
1200mm max
1200mm max
1200mm max
Cullen Gable Restraint Bracket (GRB) at maximum 1200mm centres
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 5
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