Fixing and buying guide

Who this product is for

This flashing is intended for builders, roofers, and experienced DIY installers fitting VELUX rooflights to flat roofs or low-rise vertical walls. It is suitable for both domestic and commercial applications where timber grades F16 or F24 are specified.

Compatibility and sizing

This flashing is sized 78 × 118cm and is designed specifically for VELUX rooflights on flat roofs and walls up to 1m high. It is compatible with timber grades F16 and F24 only. Always verify that your VELUX rooflight model matches this flashing size and that your structural timber meets the specified grade before purchase. Confirm your roof pitch and construction type against the product specification to ensure correct fit.

• Size: 78 × 118cm
• Timber grades: F16 and F24 only
• Application: Flat roofs and vertical walls up to 1m high
• Material: Plastic construction

Pre-installation checks

Before fitting, inspect the flashing for any damage during transport. Check that your roof structure and timber grades match the product specification. Ensure the rooflight opening is correctly sized and prepared according to VELUX installation guidance. Verify that the surrounding roof surface is clean and ready to receive the flashing. Have all necessary fixings and sealants to hand before beginning installation.

• Inspect flashing for transport damage
• Confirm timber grades F16 or F24 are present
• Check rooflight opening dimensions and condition
• Prepare roof surface and gather fixings and sealant

Installation and guidance

Install this flashing in accordance with current site practice and VELUX manufacturer guidance. The flashing must be fitted to create a complete watertight seal around the rooflight. Ensure proper overlap and secure fixing to the surrounding roof structure. Use appropriate sealants and fixings as recommended by VELUX. If you are unsure about installation, consult the manufacturer's instructions or seek professional advice.