Fixing and buying guide

What this product is and who it is for

This is a twin and combination flashing for Velux roof vents. It sits between your roof vent frame and the roof covering to create a watertight seal. It is designed for homeowners and DIY installers carrying out roof vent installations or replacements in domestic properties. The straightforward installation method makes it accessible to those with basic building experience, though you should be comfortable working at height and handling roof materials.

Compatibility and sizing

This flashing is engineered specifically for Velux roof vents with dimensions of 55cm width by 78cm height. It is compatible with FSC timber grades 32, 44, and 47, which covers the majority of standard roof structures. The flashing suits oak, pine, and spruce timber finishes. Before ordering, confirm your Velux vent size and check that your roof timber grade falls within the compatible range. If your vent is a different size or your timber grade is not listed, this flashing will not provide a proper seal.

Pre-installation checks and preparation

Before fitting, inspect the roof opening to ensure it matches the 55cm × 78cm specification. Check that the surrounding timber is in good condition and free from rot or damage. Verify that your roof covering material (slate, tile, or other) is compatible with the flashing type. Ensure you have safe access to the roof and appropriate fall protection equipment. Clear any debris from the roof opening and have the necessary tools ready, including a hammer, nails or fixings, and roofing sealant if required by the installation instructions.

• Confirm Velux vent dimensions are exactly 55cm × 78cm
• Check timber grade is FSC 32, 44, or 47
• Inspect roof opening for damage or rot
• Ensure roof covering is compatible with flashing type
• Gather tools and safety equipment before starting

Installation overview

The EKN CK02 S0021E features a straightforward installation design suitable for DIY work. The flashing is positioned around the vent opening and secured to the surrounding roof structure. Follow the manufacturer's fitting instructions carefully, as the exact method may vary depending on your roof covering type. Ensure the flashing is level and properly aligned before securing, and apply appropriate roofing sealant around joints to guarantee weatherproofing. Once installed, check that water will run away from the vent opening and that no gaps remain between the flashing and roof materials.