The three named storms which hit the UK in the first few weeks of the year are serving as a worrying reminder of the need to construct roofs which can withstand extreme windlift
Building standard BS5534:2014 slating and tiling for pitched roofs and vertical cladding code of practice, designed to ensure that new constructions can withstand these extremes, addresses every component of the construction of a standard roof to ensure it can withstand wind uplift.
Insulation specialist Actis has launched a new brochure on its insulating breather membrane Boost R Hybrid Roof, which is designed to cope with everything the British weather has to throw at it – even in areas subject to the most extreme battering.
The BS5534 classification system is designed to help builders, architects and specifiers minimise the ‘ballooning effect.’ which sees the roof underlay force tiles and slates off the roof in high winds. To comply with BS5534 the underlay must not balloon more than 35mm.
Not all underlays have sufficient wind uplift resistance to cope with zones 4 and 5, but Boost R Hybrid Roof is labelled as suitable for use in all five wind zones across the UK and Ireland.
Various Actis productscan be part of a windlift-resistant build
The brochure also provides example build-ups in a timber pitched roof using Boost R Hybrid Roof alone, as well as in combination with accompanying Actis products, honeycomb structured insulation Hybris and insulating vapour control layer H Control Hybrid.
The flexible and easy-to-use product offers an extremely effective way of eliminating condensation and preventing moisture entering the building.
Used on the cold side of roofs, it is quick and easy to install, has a water vapour permeable roofing underlay and a self-adhesive lap to ensure joints between adjacent sheets can be sealed quickly and easily, creating an airtight layer.
In common with its sister product Boost R Hybrid, it has the highest thermal resistance of any insulating breather membrane of the same thickness on the market and is extremely cost competitive.
It doesn’t require any special cutting tools, eye or respiratory protection and there’s hardly any wastage.
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