Fixing and buying guide

Who this product is for

These flashings are essential for anyone installing or replacing a VELUX EDW rooflight on a flat roof. They suit both trade installers and experienced DIY customers working with timber-framed flat roof structures. If you are upgrading an existing rooflight or installing a new one, these flashings provide the weatherproofing layer between the rooflight frame and your roof deck.

Compatibility and sizing

These flashings are specifically engineered for VELUX EDW rooflights and will not fit other rooflight models. The 78cm width × 140cm height profile is fixed and designed to accommodate the standard EDW rooflight frame. Confirm your rooflight model is EDW before ordering. The flashings are suitable for installation on timber grades F16 and F24; check your roof structure specification to ensure compatibility. Always measure your rooflight opening and verify dimensions match before purchase.

• Designed exclusively for VELUX EDW rooflights
• Fixed dimensions: 78cm wide × 140cm high
• Compatible with timber grades F16 and F24
• Not suitable for other rooflight brands or models

Installation methods

These flashings offer flexible installation options to suit your project requirements and site conditions. You can fix them using screw fixing for a mechanical hold, or adhesive application for a sealed installation. Both methods create a watertight seal when applied correctly. Choose screw fixing for easier adjustment during installation or adhesive for a fully bonded, seamless finish. Follow current site practice and VELUX manufacturer guidance for your specific installation.

• Screw fixing: mechanical hold, allows adjustment
• Adhesive application: creates fully bonded seal
• Plastic material accepts both fixing methods
• Refer to VELUX installation instructions for detailed procedure

Pre-installation checks

Before ordering or installing, verify that your rooflight is the VELUX EDW model and that your roof structure uses timber grades F16 or F24. Check the rooflight opening dimensions match the 78cm × 140cm profile. Inspect your roof deck for any damage, rot, or movement that should be addressed before flashing installation. Ensure you have the correct fixing materials on site—either stainless steel screws or roofing-grade adhesive, depending on your chosen method. Review the VELUX technical documentation and current building regulations for flat roof installations in your region.

• Confirm rooflight model is VELUX EDW
• Check timber grades are F16 or F24
• Verify rooflight opening dimensions
• Inspect roof deck condition before installation
• Source appropriate fixings or adhesive in advance