How and where to use guide
VELUX Recessed Flashings 55x78cm EDJ CK02 0000
Suitable applications and roof types
This flashing is designed for pitched roof installations where a skylight or rooflight needs to be integrated into the roof structure. It is suitable for domestic and commercial buildings with timber roof frames graded F16 or F24. The flashing is only appropriate for roofs pitched between 30 and 60 degrees; it must not be used on roofs outside this pitch range as the water shedding performance cannot be guaranteed. Confirm your roof pitch and timber grade before ordering to ensure compatibility.
- Pitched roofs only, between 30 and 60 degrees
- Compatible with F16 and F24 timber grades
- Domestic and commercial applications
- Designed for use with VELUX skylights and rooflights of the specified size
Installation and positioning
The flashing must be installed before the skylight or rooflight is positioned. The recessed design means the flashing sits within the roof opening, creating a seal between the roof structure and the window frame. Positioning must be accurate to ensure the flashing sits flush and the water drainage channels function correctly. The flashing dimensions are 55 × 78cm, so verify that your roof opening matches these measurements. Installation should be carried out by a competent roofer or surveyor familiar with skylight and rooflight installation procedures.
- Install flashing before positioning the skylight or rooflight
- Ensure roof opening dimensions match 55 × 78cm
- Position flashing level and flush within the opening
- Verify water drainage channels are unobstructed
- Secure flashing according to manufacturer instructions
Weather protection and maintenance
The high-quality plastic construction is durable and resistant to weathering. The recessed design actively directs rainwater away from the roof opening and down the roof slope, preventing water pooling or ingress around the frame. After installation, inspect the flashing periodically to ensure it remains properly seated and that no gaps have developed between the flashing and the roof structure. Clear any debris, moss, or lichen from the flashing surface and surrounding roof area to maintain effective water shedding. Do not use abrasive cleaners or high-pressure washers on the plastic, as these may damage the material.
- Inspect flashing annually for gaps or movement
- Keep flashing and surrounding roof clear of debris and moss
- Use soft brush or cloth for cleaning only
- Avoid abrasive cleaners and high-pressure washing
- Check water drainage channels remain clear and functional
Limitations and important considerations
This flashing is designed only for the specified roof pitch range of 30 to 60 degrees. Use on roofs outside this range may result in inadequate water shedding and potential leaks. The flashing is sized specifically at 55 × 78cm and is not adjustable; it must match your roof opening dimensions exactly. It is compatible only with F16 and F24 timber grades; do not use on other structural timber types. The flashing is a component of a complete skylight or rooflight installation system and must be used in conjunction with the appropriate VELUX window unit and any additional sealing or insulation materials specified by the manufacturer.
- Not suitable for roof pitches below 30 degrees or above 60 degrees
- Fixed dimensions; roof opening must be 55 × 78cm
- F16 and F24 timber grades only
- Must be used as part of a complete VELUX installation system