DuPont products allow unrestricted use anywhere in the UK, in all building characteristics and under all site conditions. All three of DuPont’s BBA-approved underlays, DuPont Tyvek Supro, DuPont Tyvek Supro Plus (with integral tape) and DuPont Tyvek Enercor roof, offer unrestricted application when tested in accordance with BS5534:2014.
Achieving compliance with BS5534:2014, the British Standard for slating and tiling, can be tricky because the revised standard refers to altitudes not greater than 100m. And some places in unexpected counties fall outside of that category, such as Essex, Surrey and Nottingham, potentially exposing contractors to unnecessary risks.
BS5534:2014 highlights the role of a roofing underlay’s wind uplift resistance in protecting against stormy weather. As all underlays are required to state the declared wind uplift of the material, the end user can determine the material’s suitability for the site’s location based on the standard being split into five zones and certain test parameters being met.
But the new standard also requires compliance with many conditions, including those relating to ridge height, roof pitch and site altitude – not greater than 100m.