How and where to use guide
VELUX Recessed Flashings 66x118cm EDJ FK06 0000
Suitable applications and rooflight compatibility
This recessed flashing is designed for use with VELUX rooflights in timber framed roof construction. It is compatible with rooflights in the 47–50cm length range and 100–120cm width range. Before ordering, verify your rooflight dimensions against these specifications to ensure correct fit. The flashing is suitable for both residential loft conversions and commercial timber frame buildings where standard-sized VELUX rooflights are being installed or replaced.
- Check rooflight length is between 47–50cm
- Check rooflight width is between 100–120cm
- Confirm timber frame construction type
- Verify VELUX rooflight model compatibility before installation
Installation and positioning
The recessed flashing must be positioned around the rooflight aperture before the rooflight unit is fitted. The flashing integrates into the timber frame structure, creating a flush, weathertight seal at the roof penetration. The 66×118cm overall size accommodates the specified rooflight dimensions with appropriate overlap for secure fixing and water shedding. Installation should follow VELUX guidance for your specific rooflight model, ensuring the flashing sits correctly in relation to roof pitch, underlayment, and external roof covering.
- Position flashing around rooflight aperture before fitting rooflight
- Ensure recessed design sits flush with roof structure
- Secure flashing according to VELUX installation instructions
- Verify weathertight seal is complete around all edges
- Integrate with roof underlayment and external covering correctly
Material durability and maintenance
The flashing is manufactured from high-density polyethylene (HDPE), providing excellent durability and resistance to weather exposure, UV radiation, and temperature fluctuations typical of UK roof environments. HDPE resists cracking and degradation over extended periods. Maintenance is minimal; periodically inspect the flashing seal for any debris accumulation or damage, particularly after severe weather. Clear any moss, leaves, or standing water from around the flashing to maintain effective water drainage and prevent blockages that could compromise the weathertight seal.
- HDPE material resists weather exposure and UV damage
- Inspect flashing annually for cracks or deterioration
- Clear debris and leaves from around the flashing
- Ensure water drainage pathways remain unobstructed
- Do not use abrasive cleaners that may damage the HDPE surface
Limitations and on-site considerations
This flashing is engineered specifically for the stated rooflight size range; using it with rooflights outside the 47–50cm length and 100–120cm width specifications will not provide an effective weathertight seal and may result in water ingress. The recessed design is optimised for timber frame construction and may not be suitable for other roof structure types. Installation should be carried out by competent persons familiar with rooflight installation and roof weatherproofing. Ensure all roof work complies with Building Regulations and relevant safety standards.
- Only use with rooflights within specified size ranges
- Not suitable for non-timber frame roof structures
- Installation requires competent, experienced personnel
- Ensure compliance with Building Regulations
- Do not attempt to modify or cut the flashing to fit incompatible rooflights