Fixing and buying guide

What this product is and who needs it

This recessed flashing is essential when installing a VELUX roof window. It sits between the window frame and your roof structure to prevent water ingress at the penetration point. The recessed design means it sits flush with the roof line for a neat finish. You need this if you are fitting a standard roof window into a timber-framed roof, concrete slab construction, or brickwork applications.

Sizing and compatibility

The 134×98cm dimensions suit standard roof window installations. Check your VELUX window specification sheet to confirm this size matches your window opening. The treated timber construction is compatible with both timber and concrete roof structures, making it versatile for most UK domestic and light commercial roof builds. The flashing can be finished with standard paint or wood stain to match your roof covering and surrounding timber.

What you get and pre-installation checks

You receive one recessed flashing unit in treated timber. Before installation, inspect the flashing for any damage in transit and check that your roof opening dimensions match the 134×98cm size. Ensure your roof structure is sound and dry. Confirm that your VELUX window frame is compatible with this EDJ UK04 grade flashing. Have your finishing materials (paint or stain) ready so you can protect the timber once installed.

• Verify roof opening size matches 134×98cm flashing dimensions
• Check VELUX window compatibility with EDJ UK04 specification
• Inspect flashing for transit damage before fixing
• Prepare paint or stain for post-installation finishing
• Ensure roof structure is dry and structurally sound

Installation and durability

The treated timber construction provides rot and insect resistance in exposed roof conditions, extending the life of the flashing. The recessed design ensures secure installation and a weathertight seal. BS 4764 compliance confirms this flashing meets UK building standards for roof window flashings. After installation, apply your chosen paint or stain finish to protect the timber and maintain appearance.