Fixing and buying guide

Who this product is for

This insulation collar suits homeowners and DIY enthusiasts carrying out loft insulation work. It is particularly useful if you have VELUX roof windows or similar roof-mounted glazing that requires thermal protection. The straightforward installation method makes it accessible for those without specialist experience, though basic DIY competence and safe working at height are essential.

Sizing and compatibility

The 94 x 160cm dimensions are designed for standard roof pitches and typical loft spaces. Before ordering, measure your roof window opening and the surrounding cavity area to ensure the collar will fit snugly. A tight fit is important for maximising insulation effectiveness and preventing thermal bridging. If your roof pitch is unusually steep or shallow, or if your opening dimensions differ significantly, check compatibility with the product specifications or seek advice before purchase.

• Dimensions: 94 x 160cm
• Material: Fiberglass batts with baked-in fire retardant
• Pack contains 10 units

Pre-installation checks

Inspect the loft space and roof structure before installation. Ensure the area around the roof window is clean and free from debris, dust, and existing loose insulation that could compress the new collar. Check that the cavity or void around the window frame is accessible and that you can work safely at height. Verify that the roof structure is sound and that there are no signs of water ingress or damp, as these must be addressed before insulation is installed. Ensure adequate ventilation in the loft space is maintained after installation to prevent condensation issues.

• Clear the installation area of debris and loose material
• Check roof structure for soundness and damp
• Confirm safe access and working conditions at height
• Verify loft ventilation will not be obstructed

Installation and use

The compact design of the fiberglass batts allows straightforward installation around roof windows. Position the collar to create a continuous thermal barrier between the window frame and the surrounding loft insulation. Ensure the collar sits snugly with no gaps, as these will reduce effectiveness. The product works in conjunction with other insulation materials such as blanket or loose-fill insulation to provide complete coverage. The baked-in fire retardant treatment means no additional fire protection measures are required for this component. Always wear appropriate protective equipment including gloves and a dust mask when handling fiberglass insulation.