Suitable for profile tiles pitched at 12.5 degrees or more, 15 degrees for slates and 22.5 degrees for plain tiles; it is manufactured from a bondable two-layered underlay with a shrink-resistant TPU coating on a robust PES (polyethersulphone) fleece which allows vapour to escape, while keeping rain water out.
Double self-adhesive edge strips provide a permanent seal and immediate weatherproofing against wind, rain and snow; while the PES fleece also incorporates a capillary stop to control the formation of condensation. This means that, unlike traditional vapour permeable underlays which provide limited weather protection if left, Permo extreme can provide a temporary weatherproofing layer if required.
With a high-temperature stability that peaks at 100°C and due to the fact that it is very UV-resistant, it also means that Permo extreme is highly suitable for installation under in-roof system solar panels.
Another benefit of Permo extreme is that it dispenses with the need for plywood or OSB support boards and counter battens – which the company estimates saves at least £8 per m2 in materials at least, not to mention time and labour costs.
Permo extreme RS SK2 is complemented by a range of accessories such as Permo extreme sealant which allows connection to rising structural components and eave flashings; an EPDM sealing collar suitable for the sealing of pipe penetrations; and Butylon tape, which is ideal for creating seals around nail penetrations.