How and where to use guide
VELUX Support Trimmer for 18mm Frame Gap - Pine Roof Windows EBY W35 3000
Typical applications and installation
Use this trimmer during installation of VELUX EBY W35 3000 pine roof windows when the frame opening has been cut to leave an 18mm gap around the window perimeter. The adjustable design allows you to customise the fit to suit your specific installation. Position the trimmer between the window frame and the surrounding roof structure, adjusting it to ensure the frame sits square and level. The trimmer holds the window securely in place and prevents movement during the sealing and finishing stages. This component is essential for maintaining the weather-tight integrity of the installation and for achieving a professional interior finish.
- Install during initial window fitting, before applying sealants or plasterboard
- Adjust the trimmer to accommodate the full 18mm gap around the window frame
- Ensure the window frame remains square and level whilst the trimmer is in position
- Use on both new installations and window replacement projects in timber-framed roofs
Compatibility and limitations
This trimmer is designed exclusively for VELUX EBY W35 3000 pine roof windows and will not fit other VELUX models or window sizes. It is engineered for 18mm frame gaps only; if your opening has a different gap size, this product will not provide a proper fit. The pine construction matches the window frame material and finish, making it suitable for visible interior applications where the frame will be seen. Do not use this trimmer for exterior applications or in locations exposed to direct weather.
- Compatible only with VELUX EBY W35 3000 models
- Designed for 18mm gaps; unsuitable for larger or smaller openings
- Interior use only; not for external or weather-exposed positions
- Pine material requires protection from moisture once installed
On-site handling and maintenance
Store the trimmer in a dry location on site to prevent moisture absorption and warping. The natural pine finish requires no pre-treatment before installation. Once fitted, protect the trimmer from water ingress by ensuring all roof seals and flashings are properly installed around the window. If the trimmer becomes wet during installation, allow it to dry naturally before covering with plasterboard or other finishes. The natural finish will weather slightly over time but requires no maintenance or additional coating. Avoid exposing the trimmer to prolonged damp conditions, as untreated pine can swell or deteriorate if moisture is not managed.
- Keep dry on site before and during installation
- No pre-treatment or finishing required before fitting
- Ensure roof seals and flashings are installed to protect the trimmer from water
- Allow any moisture to dry naturally; do not force-dry with heat