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Installer screwing metal sheet into bottom frame in connection with installing a lining for a VELUX roof window.
Introducing the new VELUX Lining starter pack
Combining the VELUX Vapour barrier collar BBX with the VELUX Lining sub-construction – all in one box for a professional, efficient installation and a well-insulated, vapour-tight finish.

Achieve the best finish with greater efficiency and full confidence

All in one boxWith the VELUX vapour barrier collar BBX and the lining sub-construction packed into one box, you have everything you need for a professional and efficient installation.
Quick, straightforward installation The ready-made lining sub-construction mounts directly onto the roof window, forming a strong and accurate framework that holds the insulation material and the lining boards securely in place.
More insulation at top and bottomThe perpendicular construction at the top and bottom creates an additional 70 mm of space for insulation which reduces cold bridges and condensation risk around the roof window, whilst maximising daylight entry.
Long lasting protectionThe complete vapour barrier collar guarantees a vapour- and airtight solution and prevents condensation from forming in the roof construction.

See how easy it is to make a professional lining installation

The lining sub-construction can be mounted directly onto the window in less than five minutes, providing a sturdy framework that holds the lining boards securely in place while making it easy to cut them to the exact size required. The vapour barrier collar fits perfectly to the roof window groove and with no need to make on-site adjustemts.

A well-designed solution to simplify your work

All in one box

With the VELUX vapour barrier collar BBX and the lining sub-construction packed into one box, you have everything you need for a professional and efficient installation.

The Lining starter pack is available for all standard VELUX roof window sizes for single installation (BBX 1000) and horizontal duo/twin combinations (BBX 1021E / BBX 1021B)

Attic room with VELUX roof window, overview of sub-construction materials on table.
More space for insulation
The perpendicular construction at the top and bottom creates an additional 70 mm of space for insulation which reduces cold bridges and condensation risk around the roof window, whilst maximising daylight entry.
Attic room with VELUX roof window, overview of sub-construction materials on table.
A vapour tight installation
The vapour barrier collar matches the exact dimensions of the roof window for a seamless fit in the lining groove. Along the entire length of all sides, rubber seals ensure a secure, vapour-tight solution. This is reinforced by the fully welded corners that create a strong and dependable barrier.
Attic room with VELUX roof window, overview of sub-construction materials on table.
A strudy framework
The lining sub-construction forms a strong and accurate framework that holds the lining boards securely in place while making it easy to cut them to the exact size required. This ensures a precise, professional finish and helps save valuable time during installation compared to traditional methods.
Attic room with VELUX roof window, overview of sub-construction materials on table.
Attic room with VELUX roof window, overview of sub-construction materials on table.

Learn more about the full VELUX installation system

The VELUX installation system includes all necessary components from outside to inside for a reliable and durable result. The step-by-step modularity with precise fit ensures a fast and logical installation process where no phases are overlooked. And of course our installation products meet all current regulations and standards for both renovation and new-build – an assurance we pass on to homeowner and installer alike.
Explore the VELUX Installation system
Roof window installation on a tiled roof with visible battens.