How and where to use guide
VELUX Insulation Collar 78x98cm BDX MK04 2000
Where to use this product
Install the VELUX Insulation Collar in loft spaces where roof windows are fitted or being retrofitted. It is designed for standard UK domestic loft installations with window openings up to 98cm in width. The collar works effectively in any loft environment where insulation surrounds the window frame, including new builds, conversions, and renovation projects. It is particularly valuable in properties where energy efficiency and thermal performance are important considerations.
- Loft conversions with VELUX roof windows
- Retrofit installations to existing loft windows
- New build loft spaces with standard window openings
- Any UK domestic installation up to 98cm window width
Installation and fitting
The collar is straightforward to fit and can be installed during initial window installation or as part of later renovation work. Position the fiberglass collar around the window frame perimeter, ensuring it sits between the frame and the surrounding loft insulation. The collar should create a continuous seal with no gaps or overlaps that would compromise its thermal performance. Fit it before or after insulation is laid, depending on your installation sequence, but ensure it is fully seated and makes contact with both the window frame and insulation material.
- Position collar around window frame perimeter
- Ensure tight contact between frame and insulation
- Avoid gaps, folds, or compression that reduces effectiveness
- Install before or after insulation depending on your sequence
Performance and maintenance
The fiberglass construction provides reliable thermal insulation performance and requires minimal maintenance once installed. The collar's primary function is to create a tight seal that prevents cold air infiltration and reduces heat loss, contributing to lower energy consumption and more stable internal temperatures. Periodically check that the collar remains in position and has not shifted or compressed, as this could reduce its effectiveness. The fiberglass material is durable and resistant to typical loft conditions, but ensure it is not damaged during installation or by subsequent work in the loft space.
- Fiberglass material is durable and low-maintenance
- Check periodically that collar remains properly seated
- Protect from damage during installation and future loft work
- Contributes to reduced heating costs and improved comfort
Limitations and considerations
This collar is sized specifically for standard UK loft window openings up to 98cm in width. If your window opening exceeds this dimension, you will need to source an alternative size. The collar works as part of a complete insulation strategy and should be used alongside appropriate roof insulation materials and proper ventilation to achieve optimal thermal performance. It is not a substitute for adequate insulation thickness or proper roof ventilation, which are essential for preventing condensation and maintaining long-term building health.
- Sized for openings up to 98cm width only
- Use alongside adequate insulation and ventilation
- Does not replace proper roof ventilation requirements
- Part of a complete thermal strategy, not a standalone solution