How and where to use guide
VELUX Twin and Combination Flashings 78x140cm EKW MK08 S0222
Installation and positioning
These flashings are fitted around the perimeter of the rooflight opening during installation. The twin and combination flashing design accommodates different roof configurations and tile or slate arrangements. Position the flashing so it sits flush against the rooflight frame and extends under the roof covering material to direct water away from the opening. Ensure the flashing is fully seated and secured according to VELUX installation instructions before laying roof tiles or slates over the upper edge.
- Install flashings before roof covering is laid
- Ensure full contact between flashing and rooflight frame
- Position upper edge under roof tiles or slates
- Check that all edges are properly sealed and bedded
Timber compatibility and structural considerations
These flashings are engineered to work with structural timber graded F16, F24, F36 or F44. Verify your roof timber grade before installation to ensure compatibility. The durable plastic construction resists rot and insect damage, protecting the timber frame beneath. This is particularly important in exposed roof positions where moisture and weather exposure are constant.
- Confirm timber grade F16, F24, F36 or F44 before fitting
- Plastic material protects underlying timber from rot and insect damage
- Suitable for exposed roof positions
Weather-tightness and maintenance
The primary function of these flashings is to maintain a weather-tight seal. Periodically inspect the flashing edges and joints to ensure no gaps have developed through settlement or weathering. Check that the seal remains intact where the flashing meets the rooflight frame and where it sits under the roof covering. Clear any debris or moss growth that could trap moisture. The plastic material requires minimal maintenance but should be kept clear of obstructions to allow water to run off freely.
- Inspect annually for gaps or damage to the seal
- Clear debris and moss growth from flashing edges
- Ensure water can run off freely without pooling
- Check joints and frame contact points for deterioration
Finish selection and aesthetic considerations
Choose your flashing finish based on your roof covering and architectural style. White, grey and brown options allow the flashing to blend with different tile colours and roof designs. Consider the dominant colour of your roof tiles or slates when selecting the finish to ensure a cohesive appearance. The finish does not affect weatherproofing performance but contributes to the overall visual integration of the rooflight installation.
- White finish suits light-coloured tiles and modern designs
- Grey finish complements slate and contemporary roofs
- Brown finish matches traditional terracotta and clay tiles