Fixing and buying guide

Who this product is for

This flashing is for builders, roofers, and experienced DIY installers undertaking pitched roof work involving twin or combination VELUX skylight installations. It is not suitable for single skylight applications or flat roof installations. You should have competence in roof work, understanding of roof pitch requirements, and familiarity with integrating flashings with existing roofing materials.

Compatibility and sizing

The EKW MK04 flashing is sized at 78x98cm and is designed for specific VELUX skylight models configured as twin or combination units. Before purchase, verify that your skylight models are compatible with this flashing specification and that the 78x98cm dimensions match your installation requirements. This flashing is engineered for pitched roof applications and will not perform correctly on flat roofs.

• Check your VELUX skylight model numbers against compatibility documentation
• Confirm roof pitch is suitable for pitched roof flashing installation
• Verify that twin or combination configuration matches your skylight layout

What is included and pre-installation checks

The flashing comprises aluminium frame components with integrated rubber seal elements designed to create a weathertight junction. Before installation, inspect the flashing for any damage to the aluminium or rubber seals. Ensure the roof structure is sound and that existing roofing material (tiles or slates) is in good condition around the installation area. Check that the skylight frames are properly positioned and aligned before fitting the flashing.

• Inspect aluminium and rubber seal components for damage or defects
• Verify roof structure is sound and capable of supporting the installation
• Confirm skylight frames are correctly positioned and level
• Ensure roof tiles or slates are secure and undamaged in the work area

Installation and water drainage

Careful alignment with the roof pitch is critical to ensure proper water drainage and prevent pooling. The flashing must be integrated seamlessly with existing roof tile or slate finishes to maintain the weathertight seal. Installation should follow VELUX guidance for your specific skylight models, paying particular attention to the positioning of the rubber seal components and ensuring all edges are properly sealed. Incorrect installation or misalignment with the roof pitch will compromise water protection and may lead to leaks.

• Align flashing carefully with the roof pitch gradient
• Integrate flashing edges with existing roof tiles or slates
• Ensure rubber seal components are correctly positioned and compressed
• Verify water drainage path is unobstructed around the flashing perimeter