TB/10 – Brickwork External Corner

This brickwork external corner detail illustrates the correct formation of a projecting corner within an insulated masonry cavity wall.

The drawing is intended for architectural designers, building professionals, contractors, developers and self-builders preparing coordinated Building Regulations information or a project specification.

For the opposite corner condition, see the corresponding re-entrant junction drawing. The wider structural context is set out in Approved Document A.

The detail shows:

• 102 mm external facing brickwork
• 50 mm clear residual cavity
• 75 mm partial-fill cavity insulation
• Celcon Solar aircrete block inner leaf
• Plasterboard on dabs with skim finish
• Bonding of the brickwork and blockwork around the corner
• Continuity of cavity insulation
• Maintenance of the residual clear cavity
• Additional wall-tie requirements at the corner
• Movement-joint considerations
• Continuity of DPCs, cavity trays and cavity barriers
• SAP junction reference E16
• Calculated psi value of 0.041 W/m·K

The accompanying specification notes cover masonry bonding, insulation installation, cavity cleanliness, wall ties, brickwork appearance, movement joints, weather protection and protection of newly constructed masonry.

What This Brickwork External Corner Detail Includes

• One downloadable PDF construction drawing
• A3 landscape sheet
• Drawn at 1:10 scale when printed at 100% on A3 paper
• Drawing reference: TB/10
• Detail title: External Corner

Important Information

This is a standard construction detail intended to provide general guidance. Brick and block bonding, wall ties, movement joints, cavity barriers and insulation must be coordinated with the project’s structural design, wall specification and manufacturers’ recommendations.

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

The drawing does not include project-specific structural calculations, masonry movement design, SAP assessment or Building Regulations approval. Purchasing or using the detail does not guarantee approval by Building Control.

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.