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RCI Feb 2018

GOOFS ON THE ROOF Redland gives dry-fixing a dry run This article sees RCI launch the first of a new monthly column called Goofs on the Roof, which will be showing common roofing installation failures and what should have been best practice. This month’s column is the dry verge special after the introduction of BS 8612 in January If properly specified, dry-fixed ridge, hip, and verge systems create trouble-free roofs that remain maintenance-free for years. The new BS 8612 Dry-fixed Ridge, Hip and Verge Sytems for Slating and Tiling will help both contractors and designers get it right, according to Kevin Ley, technical manager at Redland. January saw the publication of a new British Standard that governs the selection, quality and testing of important dry-fixed roofing systems. This is a much-needed document. There is a plethora of dry-fixed roofing products on the market, and a widespread misconception that these are commodity products with little variation between brands – apart from the price. That just isn't the case, as some find out to their cost. Dry-fixed products must be compatible with the tiles or slates on the roof, they must be correctly fixed and they must be properly designed. Failure to select the right systems leads to roofs with problems: verges that are hanging from the edge of the roof; ridge tile and verges blown off by the wind; unsightly black staining down gable-end walls due to verges which do not shed rainwater properly etc. 086 FEBRUARY 2018 RCIMAG.COM From wet to dry Though dry-fixed products have been on the market for decades – Redland introduced its very first dry verge in 1966 – demand has burgeoned over the last five years. As a result, there has also been a growth in the number of companies supplying lower cost, and often lower quality products. The switch from traditional wet fix to dry fix was driven by changes to the National House-Building Council (NHBC) ������ ���������������������� ������������������������������������������������������������������ �������������������������������������������������������������������������������������� guidance. In 2011, NHBC analysed its claims figures and discovered that 60% of them were related to roofs and of all roof-related claims, over half involved mortar. This obviously led to new NHBC guidance in 2012, which said that all bedded ridge and hip tiles had to be mechanically fixed; and then to the revised version of BS 5534 Slating and Tiling for pitched roofs and vertical cladding ��������������������������������������������������������������������������


RCI Feb 2018
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