How and where to use guide
VELUX Twin and Combination Flashings 134x140cm EKL UK08 S0122
Typical applications and suitability
This flashing is specifically engineered for VELUX skylight installations on pitched timber roofs. The 134x140cm size provides adequate coverage for most standard skylight openings and allows flexibility when positioning around existing roof features. It is suitable for both new roof installations and retrofit projects where a VELUX skylight is being added to an existing structure. The flashing works with timber grades F16, F24 and F36, covering the range of structural timber commonly used in UK roof construction.
- New skylight installations on pitched timber roofs
- Retrofit skylight additions to existing properties
- Roofs with vents, chimneys or other obstructions near the skylight opening
- Timber roof structures using F16, F24 or F36 grade timber
Installation and fitting
The flashing must be installed as part of the skylight assembly before the roof covering is laid. Position the flashing around the skylight opening, ensuring the aluminium and rubber seal components sit flush against the timber roof structure. The flashing should be secured according to VELUX installation instructions, which typically involve fixing to the roof timbers before tiles, slates or other roof covering materials are installed. The rubber seal component creates the watertight barrier, so ensure it makes full contact with the roof surface and is not compressed or damaged during installation.
- Install flashing before roof covering is laid
- Position flashing centrally around skylight opening
- Secure to roof timbers using appropriate fixings
- Ensure rubber seal sits flush and makes full contact with roof surface
- Check that flashing accommodates any nearby vents or chimneys without gaps
Maintenance and durability
Once installed, the flashing requires minimal maintenance if fitted correctly. Periodically inspect the seal, particularly after severe weather, to ensure the rubber components remain in good condition and the aluminium has not been damaged. Clear any debris such as leaves or moss from around the flashing to prevent water pooling. The combination of aluminium and rubber components is designed to provide long-lasting protection, but the rubber seal should be checked if the skylight is more than ten years old, as weathering may eventually require resealing.
- Inspect rubber seal annually for signs of cracking or deterioration
- Clear debris and moss from around the flashing
- Check for water staining on interior ceilings below the skylight
- Do not apply sealant over the flashing without consulting VELUX guidance
On-site tips and limitations
Ensure you have the correct VELUX skylight model before ordering this flashing, as compatibility is essential for a watertight seal. The 134x140cm size suits most applications, but measure your opening carefully. This flashing is designed for pitched roofs only and is not suitable for flat roof installations. Store the flashing flat and protected from weather before installation to prevent damage to the rubber seal. If the roof structure includes timbers outside the F16, F24 and F36 grades, consult VELUX technical support before proceeding.
- Confirm VELUX skylight model compatibility before purchase
- Measure roof opening to verify 134x140cm size is adequate
- Not suitable for flat roof applications
- Protect flashing from weather and physical damage during storage
- Contact VELUX if roof timber grade is not F16, F24 or F36