How and where to use guide
VELUX Twin and Combination Flashings 55x78cm EKW CK02 S0312
Suitable applications and locations
These flashings are designed for installation around skylights, rooflights and other roof penetrations. They are commonly used in roof extensions, conservatories and flat roof applications across both domestic and commercial properties. The 55x78cm size suits standard skylight and rooflight installations. Before ordering, confirm that the flashing dimensions match your specific skylight or rooflight opening to ensure proper coverage and sealing.
- Skylights and rooflights in pitched and flat roofs
- Roof extensions and conservatory installations
- Domestic and commercial roofing projects
- Timber frame, concrete slab and brickwork substrates
Installation and substrate compatibility
These flashings are compatible with timber frames (grades S1 and S2), concrete slabs and brickwork substrates. The plastic construction provides durability and weather resistance across different roof types. Installation must create a secure seal around the rooflight or skylight perimeter to prevent water penetration. Always follow the manufacturer's installation instructions and ensure the flashing sits correctly against your specific substrate type before securing.
- Confirm substrate type before installation: timber, concrete or brickwork
- Check timber grades S1 or S2 for timber frame applications
- Ensure flashing dimensions match your rooflight opening
- Follow manufacturer installation guidance for your roof type
Maintenance and durability
The plastic construction offers good weather resistance and durability in outdoor roofing conditions. Inspect flashings periodically to ensure the seal remains intact and water is not pooling around the rooflight perimeter. Clear any debris or moss growth that could compromise the watertight seal. Check that the flashing remains securely fixed and that no gaps have developed between the flashing and the roof substrate.
- Inspect regularly for signs of water ingress or seal failure
- Clear debris and moss from around the flashing
- Check that fixings remain secure
- Ensure no gaps develop between flashing and substrate
Important considerations
Always confirm product dimensions and material specification against your project requirements before ordering. The 55x78cm size must match your rooflight or skylight opening. Installation must be carried out in line with VELUX manufacturer guidance to ensure the watertight seal performs correctly and provides reliable weatherproofing for the life of the installation.
- Verify flashing dimensions match your rooflight opening exactly
- Confirm substrate compatibility before installation
- Install strictly according to manufacturer instructions
- Ensure proper sealing to prevent water ingress at roof penetrations