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Velux Window Vapour Barrier BBX UK04 134 x 98cm rafter-end-covers What design features does theThis Velux vapour barrier prevents warm air from entering your roof space. This creates an air tight seal preventing condensation build up. It's easy to install. Also the Velux vapour barrier forms an air tight seal preventing heat loss. Technical details Material: polyethylene Material thickness: 0. 15 mm SD value (water vapour diffusion resistance): 40 m Tape: 60 mm