TB/17 – Verge Detail: Cold Roof

This cold roof verge detail illustrates the junction between an insulated masonry cavity wall and a pitched roof insulated at ceiling level.

It is intended for architectural designers, building professionals, contractors, developers and self-builders coordinating gable restraint, insulation and weather protection. Use it alongside the matching cold-roof eaves drawing; Approved Document A provides the official structural guidance.

The detail shows:

• External brickwork and Celcon Solar aircrete block inner leaf
• 75 mm Kingspan Kooltherm K108 partial-fill cavity insulation
• 50 mm clear residual cavity
• Ceiling-level mineral-wool insulation
• Insulation continuity at the gable wall
• Compressible insulation between the last truss and wall
• Insulated cavity closer and fire-resisting cavity barrier
• Gable-wall restraint straps and supporting noggings
• Roofing underlay and verge support
• Proprietary dry-verge or traditional undercloak construction
• Mechanical fixing of verge tiles or slates
• SAP junction reference E12
• Calculated psi value of 0.052 W/m·K

The accompanying notes cover structural restraint, insulation continuity, cavity closure, underlay, dry-verge systems, traditional mortar-bedded verges, mechanical fixing and weather protection.

What This Cold Roof Verge Detail Includes

• One downloadable PDF construction drawing
• A3 landscape sheet
• Drawn at 1:10 when printed at 100% on A3 paper
• Drawing reference: TB/17
• Detail title: Verge Detail – Cold Roof

Important Information

This is a standard construction detail intended to provide general guidance. Roof structure, gable restraint, verge support and fixings must be coordinated with the structural design, wind-load assessment and manufacturers’ instructions.

The stated psi value applies only where the illustrated construction, geometry and insulation arrangement are followed and should be checked through the project’s thermal assessment.

The drawing does not include structural calculations, wind-load calculations, a roof layout, SAP assessment or Building Regulations approval.

The PDF is supplied for use by the purchaser on their own projects. It may not be resold, redistributed or reproduced for commercial resale without written permission.