Fixing and buying guide

What this product is and who needs it

This is a twin and combination flashing designed specifically for VELUX roof vent installations on pitched roofs. It is essential for any builder, surveyor, or serious DIY installer fitting a VELUX unit to a timber-framed pitched roof. The flashing creates the watertight seal between the roof vent and the surrounding roof covering, protecting against weather exposure and roof movement.

Compatibility and sizing

This flashing is sized at 55cm width by 98cm height and is compatible with standard VELUX roof vent units. It works with timber grades F16, F24, and F32, covering the most common structural timber specifications used in UK residential and commercial roofing. Before ordering, confirm your VELUX unit size and your roof timber grade to ensure correct fit.

• Dimensions: 55cm × 98cm
• Compatible timber grades: F16, F24, F32
• Application: Pitched roofs only
• Verify your VELUX model matches these dimensions

Finish options and selection

This flashing is available in a range of finishes to match different roof specifications and aesthetic requirements. Select your finish based on your roof covering type and local building regulations. Ensure the finish you choose is compatible with your slate, tile, or other roof covering material.

Pre-installation checks and preparation

Before installation, inspect the flashing for any damage or defects. Confirm that your roof structure is sound and that the opening for the VELUX unit is correctly sized and positioned. Check that your timber grades match the compatibility specification. Ensure you have all necessary fixings and sealants to hand, and that weather conditions are suitable for roof work. The flashing must be installed in accordance with VELUX installation instructions and current building regulations for your region.