How and where to use guide
VELUX Twin and Combination Flashings 66x118cm EKW FK06 S0222
Suitable applications and roof types
These twin and combination flashings are designed specifically for VELUX skylight installations. The 66cm × 118cm dimensions provide adequate coverage for standard skylight openings. They are compatible with both pitched roof and flat roof constructions, making them versatile for most residential and light commercial roofing projects. The flashings work in conjunction with the skylight frame to create a weathertight barrier around the perimeter of the opening.
- Use on pitched roofs with standard roof pitch angles
- Suitable for flat roof applications
- Compatible with timber structural grades F16 and above
- Designed for VELUX skylight frame integration
Installation and positioning
Before installation, ensure the roof structure and timber framing meet the F16 grade requirement or higher. The flashings must be positioned around the skylight opening to overlap existing roof covering materials and create a continuous water-shedding surface. The weather-resistant PVC construction allows the flashing to be secured to the timber frame whilst maintaining flexibility for thermal movement. Position the flashing so that the upper edge sits beneath the roof covering above the skylight and the lower edge overlaps the roof covering below, following standard flashing installation practice.
- Verify timber grades meet F16 minimum specification before installation
- Position flashing to overlap roof covering above and below the skylight opening
- Secure flashing to timber frame using appropriate fixings for PVC materials
- Ensure all joints and seams are sealed to prevent water penetration
- Allow for thermal movement between flashing and frame
Weather resistance and durability
The weather-resistant PVC construction with protective coating provides long-term protection against rain, wind, and UV exposure. This material choice ensures the flashing maintains its integrity across varying weather conditions typical in the UK climate. The PVC will not rot, warp, or degrade like untreated timber, and the protective coating helps prevent surface degradation over extended periods of exposure.
- Weather-resistant PVC resists water penetration and pooling
- Protective coating guards against UV damage and weathering
- Material does not require painting or additional protective treatments
- Suitable for long-term outdoor exposure on pitched and flat roofs
Maintenance and site handling
These flashings require minimal maintenance once installed. During storage and transport on site, protect the PVC from excessive heat and direct sunlight to prevent warping. Handle carefully to avoid damage to the protective coating. After installation, periodically inspect the flashing joints and seal points to ensure they remain watertight, particularly after severe weather. Clean debris from around the skylight opening to maintain proper water drainage.
- Store in cool, shaded conditions away from direct sunlight before installation
- Inspect flashing seals annually, particularly after winter weather
- Clear leaves and debris from around the skylight opening
- Check that overlaps remain secure and seals have not cracked or separated