Fixing and buying guide

Who this product is for

This flashing is essential if you are installing or replacing a 78x118cm VELUX MK06 roof window on a pitched roof. It is suitable for both new build and retrofit applications where you need a reliable, integrated flashing solution that simplifies the specification and ordering process. Builders, roofers, and serious DIY installers working with VELUX MK06 windows will benefit from the reduced complexity of this twin and combination design.

Compatibility and sizing

This flashing is sized and engineered exclusively for 78x118cm VELUX MK06 window frames. Before ordering, confirm that your roof window is both the correct size and frame type. The MK06 designation is critical—using this flashing with other VELUX frame types will not provide a proper seal. Check your existing window documentation or the frame markings on your current installation to verify compatibility.

• Window size must be exactly 78x118cm
• Frame type must be VELUX MK06
• Not compatible with other VELUX frame systems
• Designed for pitched roof applications only

What is included and pre-installation checks

This product is a complete twin and combination flashing unit that combines both upper and lower weatherproofing elements. Before installation, inspect the flashing for any damage in transit and ensure your roof opening dimensions match the 78x118cm specification. Verify that your roof pitch falls within the standard range for pitched roof installations and that the roof structure is sound and ready to receive the window and flashing assembly.

• Inspect flashing for transport damage before fixing
• Confirm roof opening is correctly sized at 78x118cm
• Check roof pitch is suitable for pitched roof installation
• Ensure roof structure is sound and level
• Have all VELUX MK06 window frame components ready

Installation overview

The twin and combination design streamlines installation by integrating upper and lower weatherproofing into one system, meaning fewer separate flashing pieces to fit and seal. The flashing integrates directly with your VELUX MK06 frame to create a weather-tight seal. Follow VELUX installation guidance carefully, ensuring the flashing is correctly positioned and secured to the roof structure before fitting the window frame itself. Proper sealing and weatherproofing at this stage is critical to prevent water ingress and maintain thermal performance.