Fixing and buying guide

What this product is and who needs it

This support trimmer is a structural and sealing component used during VELUX roof window installation. It bridges the gap between the window frame and the roof opening, providing support and helping to create a watertight installation. You need this product if you are installing a VELUX EBY W20 pine roof window and your roof structure has an 18mm frame gap. It is essential for preventing water leaks around the window perimeter.

Compatibility and sizing

This trimmer is specifically designed for VELUX EBY W20 pine roof windows with an 18mm frame gap. The 3000mm length is suitable for standard roof window installations. Before ordering, confirm that your VELUX window model is EBY W20 and measure your frame gap to ensure it is exactly 18mm. Using a trimmer sized for a different gap width will compromise the watertight seal and window performance.

• Compatible with VELUX EBY W20 pine roof windows only
• Designed for 18mm frame gaps
• 3000mm length covers standard installation requirements
• Verify frame gap measurement before purchase

What you receive and pre-installation checks

You will receive one 3000mm length pine support trimmer. Before installation, inspect the trimmer for damage or warping and check that your roof opening dimensions and frame gap match the product specification. Ensure the roof structure is sound, dry, and ready to receive the window. Have all VELUX window components and flashing materials to hand before beginning work.

• One 3000mm pine trimmer supplied
• Inspect for damage or defects on arrival
• Confirm frame gap is exactly 18mm
• Ensure roof structure is sound and dry
• Have VELUX window frame and flashing kit available

Installation and working with this product

The pine construction allows for easy cutting and positioning in confined roof spaces. Position the trimmer to bridge the 18mm frame gap, providing support around the window frame perimeter. The trimmer helps create the seal that prevents water ingress, so ensure it is firmly seated and properly secured according to VELUX installation instructions. Pine is a workable material that can be cut to length if required, though the 3000mm length is designed for standard installations.