How and where to use guide
VELUX Recessed Flashings W/ Installation Productions 55x78cm EDJ CK02 2000
Typical applications and installation locations
This recessed flashing is designed for use in timber-framed buildings where cavity wall construction is present. The 55 x 78cm size makes it suitable for standard roof void applications and eave junctions. Install the flashing at points where the roof structure meets external walls, particularly where water run-off or wind-driven rain could penetrate the building envelope. The flashing is intended for recessed installation, meaning it sits within the roof structure rather than as a surface-mounted component. This type of installation is common in new build timber frame construction and when upgrading weather protection during renovation projects.
- Roof void junctions where roof meets cavity wall
- Eave details and soffit areas vulnerable to water ingress
- New build timber-framed structures
- Renovation projects requiring improved weather sealing
Installation and positioning
Position the flashing in the recessed cavity or junction area before the final roof covering or wall finish is applied. The flashing must be secured firmly to prevent movement during construction and subsequent weather exposure. Ensure the flashing overlaps adjacent materials correctly to create a continuous watertight barrier. The high-density polyethylene material is straightforward to handle and cut if necessary on site, though care should be taken to maintain the integrity of the seal. Work should be carried out by experienced builders or roofers familiar with timber-frame construction and cavity wall detailing.
- Install during timber frame assembly before roof covering
- Secure firmly to prevent movement and gaps
- Ensure proper overlap with adjacent materials
- HDPE material can be cut on site if required
Maintenance and durability
The high-density polyethylene construction is weather-resistant and requires minimal maintenance once installed. Periodically inspect the flashing during routine roof and gutter maintenance to ensure it remains in place and that no debris has accumulated around the junction. The HDPE material will not rot or corrode, unlike traditional metal flashings, and does not require painting or protective coatings. Check that water is flowing freely away from the flashing and that no standing water or ice dams are forming at the junction point.
- Inspect during annual gutter and roof maintenance
- Clear debris from around junction areas
- No painting or coating required
- Monitor for standing water or ice dam formation
Limitations and important considerations
This flashing is specifically engineered for recessed applications in timber-framed buildings with cavity wall construction. It is not suitable for use as a surface-mounted flashing or in solid wall constructions where different detailing is required. The 55 x 78cm size is fixed and cannot be enlarged; ensure this dimension matches your junction requirements before ordering. Installation should be completed before final roof covering and wall finishes are applied, as retrofitting to an existing completed structure is not practical. Always follow the installation instructions provided with the product to ensure the watertight seal is achieved correctly.
- Designed for recessed installation only, not surface mounting
- Specific to timber-framed cavity wall construction
- Fixed size cannot be enlarged
- Must be installed during construction, not as a retrofit