Fixing and buying guide
VELUX Twin and Combination Flashings 134x140cm EKL UK08 S0222
What this product is and who needs it
This flashing is a roof penetration seal designed specifically for VELUX roof ventilation units. It prevents water ingress around the ventilation opening where it passes through the roof covering. You need this product if you are installing a roof ventilation unit on a pitched roof and want to ensure a secure, durable weather-tight seal that will protect your roof structure and interior from water damage.
Compatibility and sizing
This flashing is sized at 134x140cm and is suitable for pitched roofs between 30° and 90°. It is compatible with timber roof structures graded F16 or higher. Check your roof pitch angle and timber grade before purchase. The natural oak and grey finish options allow you to select the colour that best matches your roof covering and ventilation unit specification.
- Roof pitch range: 30° to 90°
- Timber grade requirement: F16 or higher
- Size: 134 x 140cm
- Finishes: Natural oak or grey
Pre-installation checks
Before fixing, verify that your roof pitch falls within the 30° to 90° range using a pitch gauge or inclinometer. Confirm your roof timber is graded F16 or above, as lower grades may not provide adequate support. Check that the flashing size matches your ventilation unit opening dimensions. Ensure the roof covering around the penetration point is in good condition and free from damage, rot, or deterioration that could compromise the seal.
- Measure and confirm roof pitch is between 30° and 90°
- Verify timber grade is F16 or higher
- Check roof covering condition around the opening
- Confirm flashing size matches your ventilation unit
Material and durability
The flashing is manufactured from plastic with a rust-resistant coating, making it durable and reliable in harsh weather conditions. This material choice eliminates concerns about metal corrosion and provides a long service life. The weather-tight seal design ensures water is directed away from the roof structure, protecting against leaks and structural damage over time.