How and where to use guide
VELUX Twin and Combination Flashings 134x98cm EBL UK04 0021B
Suitable applications and installation locations
This twin and combination flashing is designed for installation around VELUX skylights and rooflights in pitched roof constructions. The 134cm by 98cm dimensions are sized for standard roof openings. Before installation, confirm that your VELUX window frame is either F16 or F24 timber grade and has been finished with paint or varnish, as this flashing is specifically compatible with these specifications. The flashing should be installed at the point where the skylight or rooflight penetrates the roof structure, creating a seal between the window frame and the surrounding roof covering.
- Suitable for VELUX skylights and rooflights only
- Compatible with F16 and F24 timber grades
- Use only on frames with paint or varnish finishes
- Designed for pitched roof applications
- Check opening dimensions match the 134cm × 98cm flashing size
Installation and fixing guidance
Installation should follow current site practice and VELUX manufacturer guidance specific to your window model. The plastic flashing must be securely fixed around the entire perimeter of the roof opening using appropriate fixings for your application and roof covering type. Ensure the flashing sits correctly against the timber frame and is fully bedded into the surrounding roof covering material, whether slate, tile, or other pitched roof finish. All joints and edges must be sealed to maintain the watertight integrity of the installation.
- Follow VELUX manufacturer installation instructions for your specific window
- Use fixings appropriate to your roof covering material
- Ensure full contact between flashing and timber frame
- Bed flashing securely into surrounding roof covering
- Seal all joints and edges to prevent water ingress
Maintenance and durability
The robust plastic construction of this flashing is engineered to withstand varied UK weather conditions including rain, wind, and temperature fluctuations. Periodically inspect the flashing and surrounding roof area to ensure the seal remains intact and no debris has accumulated around the window frame. Check that all fixings remain secure and that the flashing has not lifted or shifted. If paint or varnish on the timber frame becomes damaged, repair it promptly to prevent moisture penetration into the timber.
- Inspect flashing regularly for damage or movement
- Clear debris from around the window frame and flashing
- Check fixings remain secure and tight
- Maintain paint or varnish finish on timber frame
- Address any signs of water ingress immediately
Important limitations and site considerations
This flashing is designed specifically for VELUX skylights and rooflights and should not be used with other window manufacturers or applications. Confirm before purchase that your roof opening dimensions are compatible with the 134cm by 98cm flashing size. Installation requires working at height on pitched roofs, so appropriate safety measures and equipment must be in place. The flashing is not suitable for flat roof applications or for timber frames that have not been finished with paint or varnish.
- VELUX windows only – not compatible with other manufacturers
- Verify roof opening dimensions before ordering
- Not suitable for flat roof installations
- Requires appropriate fall protection and safety measures
- Do not use on unfinished or stained timber frames