Fixing and buying guide

What this product is and who needs it

This is a twin and combination flashing designed specifically for VELUX rooflights and skylights installed into timber frame roofs. It sits between the window frame and your roofing material to create a weathertight seal. You need this if you are installing a new VELUX rooflight, replacing an existing flashing, or working on timber frame construction projects where roof windows are required.

Compatibility and sizing

This flashing is sized at 78 x 98cm and is graded for EKL MK04 timber construction. It is compatible with VELUX rooflights and skylights of matching dimensions. Before ordering, confirm your roof window size matches these measurements and verify that your timber frame specification aligns with EKL MK04 grade. The flashing works with multiple timber types including oak, pine, and spruce.

• Size: 78 x 98cm — check your rooflight dimensions match
• Timber grade: EKL MK04 — confirm your frame specification
• Material: PVC construction for durability and weather resistance
• Compatible with standard VELUX rooflights and skylights

What is included and pre-installation checks

You are receiving one twin and combination flashing unit. Before installation, inspect the flashing for any damage during transit, ensure your roof opening dimensions are accurate to 78 x 98cm, and verify that your roofing material and timber frame are ready to receive the flashing. Check that your VELUX rooflight frame is compatible with this flashing type and that you have all necessary fasteners and sealants to hand.

• Inspect flashing for transport damage before fixing
• Measure your roof opening to confirm 78 x 98cm fit
• Ensure roofing material is prepared and accessible
• Confirm VELUX rooflight frame compatibility
• Have fasteners and weatherproof sealant ready

Installation and fixing

The flashing is positioned around the rooflight frame to create a seal between the window and roofing material. It must be secured firmly to prevent water ingress and movement. Follow VELUX installation guidance for your specific rooflight model, ensuring the flashing is bedded in weatherproof sealant and fastened securely to both the frame and roofing material. Proper installation is critical to prevent leaks and ensure long-term weather protection.