Reinforced with laminated nonwoven polypropylene, this Tyvek Supro plus is a sturdy membrane that is resistant to water. It can be used for both supported and unsupported pitched roofs as it is vapour-permeable and airtight. Suitable for various applications, including Scottis... Read More
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Reinforced with laminated nonwoven polypropylene, this Tyvek Supro plus is a sturdy membrane that is resistant to water. It can be used for both supported and unsupported pitched roofs as it is vapour-permeable and airtight.
Suitable for various applications, including Scottish sarking board systems, low-pitched metal roofs, wall and floor installations, and warm, hybrid, and cold roofs, this water-resistant membrane eliminates the need for soffit, tile, or ridge ventilation. As a result, it is a cost-effective and time-saving solution during construction.
Approved by BBA and IAB for use in all pitched roof constructions, this membrane is designed to endure extended exposure to UV radiation and high temperatures. Tyvek Supro plus also features an adhesive lap tape that is integrated into the membrane, which is perfect for the Tyvek sealed roof system. By sealing all horizontal laps, the system's thermal efficiency improves significantly as air infiltration is reduced.
Question:
do i need a vapour barrier when using this Tyvek. Its a 1930 house with no roof insulation. I am replacing the roof tiles and want to put in 80mm celotex with breathable roofing felt. The rafters are 100 x 50, do i need an airgap and would 20 mm be enough, Its a cold roof thanks
Answer:
Tyvek Supro (or any breathable membrane) only handles external moisture.
When you add insulation between rafters, warm indoor air will try to move outward — and without a vapour control layer on the room side, that moisture can condense inside the insulation or on the rafters.
So in a cold roof, the usual build‑up is:
Room → VCL → insulation → ventilation gap → breathable membrane → battens → tiles
A VCL is still required even with a high‑quality breather membrane.
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