Fixing and buying guide

Who these flashings are for

These flashings are for builders, roofers, and serious DIY installers working on timber-framed roof projects that require integrated ventilation. They are suitable for new builds and renovation work where roof ventilation systems need to be sealed and flashed into the roof structure. Use them if you are installing VELUX roof vents or fans and need to manage condensation risk in ventilated roof spaces.

Compatibility and sizing

These flashings are compatible with VELUX roof ventilation systems and are designed for use with timber grades F16 or higher. The 94cm width by 160cm length profile is sized for larger roof installations and critical ventilation zones. Before ordering, confirm that your roof timber meets the F16 minimum grade requirement and that the flashing dimensions suit your roof pitch and vent positioning. Check your VELUX system documentation to ensure compatibility with your specific vent or fan model.

What is included and pre-installation checks

This pack contains 10 individual flashings. Before installation, inspect each flashing for damage to the epoxy resin coating and check that all edges are clean and free from burrs. Verify that your roof structure is sound, your timber grades are confirmed as F16 or higher, and that you have the correct VELUX ventilation components ready. Ensure you have appropriate fixings and sealants suitable for use with the epoxy-coated metal surface.

• Pack contains 10 flashings at 94cm × 160cm each
• Epoxy resin coating must be intact before installation
• Confirm timber grade F16 or higher on your roof structure
• Have VELUX vent or fan components ready before fixing
• Prepare suitable fixings and weather-resistant sealant

Fixing and installation

Install these flashings according to VELUX system instructions, positioning them to integrate your roof vent or fan into the roof structure. The epoxy resin coating provides durable weather protection, so avoid scratching or damaging it during handling and installation. Secure the flashing firmly to the timber structure using appropriate fixings, and seal all joints with a weather-resistant sealant to prevent water ingress. Ensure the flashing is correctly aligned with your ventilation system to maintain efficient airflow and condensation control.

• Follow VELUX system installation guidance for your specific vent or fan
• Handle carefully to protect the epoxy resin coating
• Use fixings suitable for the timber grade and flashing material
• Seal all joints with weather-resistant sealant
• Verify correct alignment with ventilation system before final fixing