Fixing and buying guide

Use this buying guide for VELUX Underfelt Collar 78x98cm BFX MK04 1000 before ordering. What to check before buying: - Confirm dimensions and compatibility with adjoining components. - Verify fixings, adhesives, and accessories required for installation. - Match quantity to project area and allow for cuts/wastage. - Product overview: VELUX Underfelt Collar BFX MK04 1000 provides a weather-tight seal for timber frame roof construction. Sized 78cm x 98cm, it protects against the elements and prevents air leaks.