COMMENT & OPINION
s ignificant risk that past mistakes concerning mortar fix failures would be repeated”.
Though dry-fixed products have been on the market for decades, demand has burgeoned over the last five years. As a result, there’s also bee a growth in the number of companies supplying lower c ost, and often lower quality, products.
The switch from traditional wet fix to dry fix was initially driven by changes to 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 led to changes in NHBC
guidance in 2012 which said that all bedded ridge and hip tiles had to be mechanically fixed; and then to the 2014 revised version of BS 5534 Slating and Tiling for Pitched Roofs and Vertical Cladding – Code of Practice which standardised these changes. As a result, many developers have migrated to dry-fix systems as they are far faster to fit than double-fixed wet systems.
However, the purchase of poor performing dry fix systems, or the failure to install quality components correctly, leads to roofs with problems.
For example, this may mean ridge and/or hip tiles blown off by the wind; dry verges hanging from roof edges, or unsightly black staining down gable-end
walls due to verges which do not shed rainwater properly. The latter problem of verge failure to shed rainwater away from the wall at worst, can lead to penetrating damp and compromise cavity wall insulation. The publication of BS 8612, the first ever product standard for dry-fixed ridge, hip and verge
products in the UK, is therefore an essential and welcome landmark for the industry. Not only will it ensure that dry-fix design and installation standards are raised; but also that developers, contractors and building owners get the product quality and performance they deserve. BMJ
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