How and where to use guide
VELUX Twin and Combination Flashings 66x118cm EBP FK06 0021B
Suitable applications and roof types
These flashings are designed for both flat roof installations and pitched roofs with a maximum pitch of 30 degrees. The 66×118cm size suits standard roof window openings. Use these flashings in new build projects, roof repairs, and extension work where you need to install a roof window with a secure, watertight seal. The combination flashing design makes them adaptable to different roof structures and construction methods.
- Flat roof installations
- Pitched roofs up to 30 degrees maximum
- New builds and roof extensions
- Roof window repairs and replacements
- Standard roof openings 66×118cm
Installation and on-site use
Install the flashing around your roof window opening to create a watertight seal against wind-driven rain and snow. The combination flashing design allows for straightforward installation with adjustment capability on site. Position the timber frame around the window opening and secure it to your roof structure according to the roof pitch and construction type. The natural oil-based treatment on the FSC-certified softwood provides durability, but ensure the flashing is properly bedded and sealed to your roofing material to maintain the watertight integrity.
- Position flashing around roof window opening before installing the window unit
- Adjust the combination flashing design to suit your specific roof structure
- Secure the 32mm thick timber frame to the roof structure
- Bed and seal the flashing to your roofing material to maintain watertight protection
- Check that the roof pitch does not exceed 30 degrees before installation
Material durability and maintenance
The FSC-certified softwood construction with natural oil-based treatment resists rot and insect damage, providing long-term durability. The 32mm thick timber frame is robust enough to support the flashing and integrate seamlessly with your roof structure. To maintain performance, ensure the flashing remains clear of debris and that the seal between the flashing and roofing material stays intact. Check periodically for any signs of water ingress or damage to the timber, particularly after severe weather.
- FSC-certified softwood resists rot and insect damage
- Natural oil-based finish provides durable weather protection
- Keep the flashing clear of moss, leaves, and debris
- Inspect the seal between flashing and roofing material regularly
- Check timber frame for damage after severe weather or high winds
Limitations and important considerations
These flashings are designed for roofs with a maximum pitch of 30 degrees. Do not use on steeper pitched roofs as the flashing design will not provide adequate weather protection. The 66×118cm size is fixed and suits standard roof openings; confirm your roof window opening dimensions before ordering. The combination flashing design requires proper installation and sealing to the roofing material to achieve the watertight seal; poor installation or inadequate sealing will compromise weather protection.
- Maximum roof pitch is 30 degrees; unsuitable for steeper roofs
- Fixed size 66×118cm; confirm your roof opening dimensions before purchase
- Proper sealing to roofing material is essential for watertight performance
- Installation must follow roof structure and construction type requirements