The velux underfelt collar delivers weathertight protection engineered to seal roof windows securely to roofing underfelt and structural battens. Featuring pleated diffusion-open material, this collar adapts flexibly to varying roof constructions. The pleated design ensures consistent contact with underfelt regardless of installation conditions, while the diffusion-open material actively minimises condensation risk. Welded corners provide watertight integrity and simplify installation procedures. An integrated transverse drainage gutter at the window head diverts water effectively if roof tiles or slates sustain damage above the installation. This 780 x 1398mm collar suits mk08 roof window models, delivering reliable performance across residential and commercial roofing applications. Features & benefits: pleated diffusion-open material adapts to varying roof constructions while minimising condensation risk. Welded corners ensure watertight seal and streamlined installation process. Integrated transverse drainage gutter diverts water from window head if tiles or slates are damaged. Flexible seal maintains contact with roofing underfelt across diverse installation conditions. Ideal for residential and commercial roof window installations requiring weathertight protection. Size: 780 x 1398mm. Model: bfx mk08 1000. Compatible with roof window model: mk08.
The velux underfelt collar delivers weathertight protection engineered to seal roof windows securely to roofing underfelt and structural battens. Featuring pleated diffusion-open material, this collar
