How and where to use guide
VELUX Standard Flashings 55x98cm EDP CK04 0000
Typical applications and where to use
This flashing is used to seal VELUX rooflights and compatible roof applications where a watertight barrier is required. It is installed around the perimeter of the rooflight frame where it meets the roof surface. The product is suitable for timber-framed roofs constructed from F16 or F24 grade timber, which are standard structural grades found in UK residential and light commercial buildings. The flashing prevents rainwater from penetrating the gap between the rooflight and the roof structure, protecting the interior from water damage and maintaining the integrity of the roof assembly.
- VELUX rooflight installations and replacements
- Timber-framed roof structures with F16 or F24 grade timber
- New build and retrofit rooflight applications
- Situations where watertight sealing around the rooflight frame is critical
Installation and on-site use
The flashing is straightforward to install and suitable for both trade and DIY use. The 55cm and 98cm lengths allow you to cut the flashing to the required size on site using standard cutting tools. Position the flashing around the rooflight frame perimeter, ensuring it sits flush against both the rooflight frame and the roof surface. The plastic construction allows for easy manipulation and fitting around the frame edges. Secure the flashing according to the rooflight manufacturer's instructions, typically using fixings or adhesive as specified. Ensure the flashing overlaps correctly to direct water away from the rooflight frame and down the roof slope.
- Measure the rooflight perimeter and cut flashing to length on site
- Position flashing around the frame, ensuring full contact with both frame and roof surface
- Follow VELUX installation guidance for securing the flashing
- Check that overlaps are correct to prevent water pooling or ingress
- Work methodically around all four sides of the rooflight frame
Limitations and important considerations
This flashing is designed specifically for VELUX rooflights and compatible roof applications on F16 and F24 timber grades. It is not suitable for use with other rooflight brands unless compatibility is confirmed. The plastic material is durable and weather-resistant but should be handled carefully during installation to avoid damage or cracking. The flashing relies on correct installation and proper overlap to achieve its watertight seal; poor fitting will compromise water protection. Always refer to the VELUX rooflight installation instructions to ensure the flashing is used in conjunction with any other sealing components required for that specific rooflight model.
- Confirm compatibility with your specific VELUX rooflight model before purchase
- Not suitable for non-timber roof structures or timber grades below F16
- Handle plastic flashing carefully to avoid damage during installation
- Correct installation is essential for watertight performance
Maintenance and durability
The plastic construction of this flashing provides good durability and weather resistance, requiring minimal maintenance once installed. Periodically inspect the flashing during routine roof maintenance to ensure it remains in good condition and that the seal around the rooflight has not been compromised by movement, weathering, or debris accumulation. If the flashing becomes damaged or the seal fails, water ingress may occur; in such cases, the flashing should be replaced. Keep the area around the rooflight clear of moss, leaves, and other debris that could trap moisture or prevent proper water drainage.
- Inspect flashing annually as part of roof maintenance
- Clear debris from around the rooflight to maintain proper drainage
- Replace the flashing if damage or seal failure is detected
- Monitor for signs of water ingress around the rooflight frame