How and where to use guide
VELUX Recessed Flashings W/ Installation Productions 78x98cm EDN MK04 2000
Suitable applications and locations
This recessed flashing is designed for installation around VELUX rooflight and skylight openings in pitched roof constructions. It is suitable for both new buildings and existing roof structures, provided the surrounding timber framework meets F16 grade or above. The 78×98cm size accommodates standard rooflight apertures. Use this product in exposed roof positions where weatherproofing around the rooflight perimeter is essential to prevent water penetration into the building fabric.
- VELUX rooflight installations in pitched roofs
- New build and retrofit applications
- Timber-framed roof structures with F16 grade timber or above
- Standard rooflight apertures measuring approximately 78×98cm
- Exposed roof positions requiring weather protection
Installation and positioning
The recessed flashing is installed around the rooflight opening to sit flush with the roof surface, creating a weathertight seal. Position the flashing so it overlaps the roof covering material and sits securely against the rooflight frame. Ensure the timber structure meets minimum F16 grade before installation. The flashing must be properly seated to prevent water pooling or lateral water ingress at the rooflight perimeter. Follow VELUX installation guidance to ensure correct alignment and secure fixing.
- Install around the rooflight opening perimeter
- Ensure timber grade F16 or above is present
- Position to overlap roof covering materials
- Seat flashing flush with roof surface
- Secure fixing to prevent movement or gaps
Material properties and durability
The flashing is manufactured from high-quality plastic construction that resists harsh weather conditions, UV exposure, and temperature fluctuations typical of roof environments. This durable material withstands rain, wind, and seasonal movement without degradation. The plastic composition is designed to remain flexible and maintain its weatherproofing properties over the building's service life, reducing the risk of cracking or separation at the rooflight seal.
- High-quality plastic resists weather exposure
- Maintains flexibility in temperature variations
- Durable against UV and rain exposure
- Prevents water ingress when properly installed
- Long-term weatherproofing performance
Maintenance and on-site considerations
After installation, periodically inspect the flashing seal to ensure no gaps or separation have developed, particularly after severe weather or building settlement. Clear any debris, moss, or lichen from the flashing surface to maintain water run-off. Check that the overlap with roof covering materials remains intact and that no water is pooling around the rooflight perimeter. The plastic construction requires no special treatment, but ensure the seal remains unbroken. If damage occurs, the flashing should be replaced to maintain weatherproofing integrity.
- Inspect seal periodically for gaps or separation
- Clear debris and organic growth from flashing surface
- Verify water run-off is not obstructed
- Check overlap with roof covering remains intact
- Replace if damage compromises the weatherproof seal