Fixing and buying guide

What this product is and who needs it

This is a dual-function flashing system for pitched roof installations where two VELUX roof windows are positioned adjacent to each other or in combination arrangements. It is essential for builders, roofers, and experienced DIY installers undertaking multiple window installations who need integrated weatherproofing that bridges the gap between two window frames and the surrounding roof structure. The combined upper and lower components eliminate the need to source and align separate flashings, reducing installation complexity.

Compatibility and sizing

The EBL MK06 0021B flashing is sized at 78x118cm to match standard rafter spacing on pitched roofs. It is compatible with VELUX roof window ranges and works with tiled, slated, or sheet-covered roof finishes. Before ordering, confirm that your roof windows are VELUX branded and that your rafter spacing aligns with this standard dimension. Check your window model numbers against VELUX compatibility charts to ensure this twin and combination flashing is the correct choice for your installation layout.

• Verify VELUX window compatibility with your specific models
• Confirm standard rafter spacing matches 78x118cm dimensions
• Check roof covering type is tiled, slated, or sheet material
• Measure the gap between adjacent windows to ensure dual configuration suits your layout

Pack contents and pre-installation checks

Each pack contains one integrated twin and combination flashing unit with both upper and lower components combined. Before installation, inspect the flashing for damage in transit, ensure all edges are clean and free from debris, and lay it out on a flat surface to confirm it is not warped or bent. Check that your roof opening dimensions and window frame positions match the 78x118cm specification, and verify that the roof structure is sound and ready to receive the flashing.

Installation preparation

Ensure the roof surface is clean and clear of moss, dirt, or loose material around the installation area. Have all necessary roofing materials ready, including tiles or slates, mortar or adhesive, and any additional sealants recommended by VELUX. Position both roof windows in their frames before fitting the flashing to confirm alignment. The integrated design means the upper and lower components work together, so do not attempt to separate them. Follow VELUX installation instructions carefully to achieve proper weatherproofing and avoid water ingress.