Fixing and buying guide

What this product is and who it is for

This recessed flashing is a weather-sealing component for builders and roofers working on timber-framed properties. It is specifically engineered for cavity wall constructions where water penetration at roof junctions must be prevented. The product suits experienced installers on new builds and renovation projects requiring robust moisture control at vulnerable points in the building envelope.

Sizing and compatibility

The flashing measures 55 x 78cm and is designed for recessed installation in roof voids and eave areas. This size is suited to standard roof junction applications in timber-framed buildings with cavity wall construction. Confirm your roof void dimensions and junction geometry before ordering to ensure this size matches your installation requirements. The recessed design means it sits within the building structure rather than projecting above the roof line.

Material and durability

The flashing is manufactured from high-density polyethylene (HDPE), a weather-resistant plastic material engineered to withstand prolonged exposure to the elements. This material resists UV degradation and moisture penetration, making it suitable for long-term outdoor use in roof void and eave applications where traditional metal flashings may be impractical.

• HDPE construction provides weather resistance and durability
• Designed to prevent water ingress at critical building junctions
• Suitable for timber-framed cavity wall constructions

Pre-installation checks and preparation

Before installation, inspect your roof void and junction areas to confirm they are clean, dry, and free from debris. Verify that the 55 x 78cm flashing dimensions match your recessed installation space. Ensure all timber framing and cavity wall construction is sound and properly prepared. Check that surrounding materials are compatible with HDPE and that you have adequate access for secure fixing. Installation should be carried out by experienced builders or roofers familiar with recessed flashing techniques in timber-framed buildings.

• Confirm roof void and junction dimensions match the 55 x 78cm flashing size
• Inspect and clean the installation area thoroughly
• Verify timber framing and cavity wall construction are sound
• Ensure you have appropriate fixing materials and tools for recessed installation