ROOFLIGHTS & ROOF VENTS Pitch perfect fit The specification and correct form of a rooflight and its installation must suit the particular roof covering and roof geometry. The trend to lower roof pitches of less than 4° slope, particularly on very large, wide span roofs, can present water drainage and airtightness difficulties. In these cases, this further emphasises the requirement for the selection of rooflight type most appropriate for application conditions, a high level of workmanship on site, and the reliance on effective sealing to ensure a roof remains weathertight. In terms of weathertightness – of dome rooflights for instance – they should meet the requirements of BS EN 1873:2005 for all-weather performance, with a water penetration test having been carried out to ensure the integrity of that particular rooflight. In the case of profiled rooflights the accurate fitting together of dissimilar materials – plastic rooflight to metal roof covering – is key to weatherability. The locality and external environment also play a part in the rooflight installation, with wind loading, precipitation, orientation to sun (i.e solar over-heating) having to be taken into account. Some products in the marketplace rely heavily on a high level of workmanship and sealant to ensure integrity and weathertightness. If the finer details of the product are possibly not as good as they could be, this puts the onus of weathertightness and fitting integrity on the part of the installer. In these cases, particular attention should be made to junctions, as a badly formed junction will create a poor fit, potentially leading to water ingress. Rooflight products should ultimately be made-to-fit with minimum sealant application. Health and safety For contractors wishing to reduce site time on a roof and enhance safety, factory assembled rooflights are manufactured to tight tolerances, ensuring an accurate and reliable fit on site leading to time saved on installation, and reduced fitting costs. Quality products perform With margins low and budgets tight, it’s important to recognise the value of UK quality standards for rooflights and check the origins and evaluate objectively the credentials of rooflight products. Selecting an apparently lower cost rooflight might well compromise performance requirements and lead to higher costs in the long term. A combination of correct specification, competent management and professional installers will, in the long term, be a significant contributor to durability reducing the maintenance requirements of any roof or rooflight. Contractors and clients should be mindful of the possible implications of high maintenance warranties which may only be valid if an annual, detailed and independent third party inspection is made, which will add to long-term costs. “A combination of correct specification, competent management and professional installers will, in the long term, be a significant contributor to durability” Using a reputable rooflight manufacturer offers far more than the quality of the product itself. Leading suppliers and manufacturers design a wide range of systems to deliver optimum performance, durability, safety and regulation standards. They also provide superior technical support, detailed installation instructions and maintenance guidelines to ensure systems perform as promised, and work alongside all other roofing elements. www.brettmartin.com Call us: 01670 354 157 Or visit: xtralite.co.uk X-TWO from Xtralite Triple glazed with Ud value of 1.6 W/M2.K Reduced risk of cold bridging & condensation Unique mounting systems for easier attachment and installation Up to 40% more light transmission with vertical kerb option Increased ventilation levels Easy opening and ventilation control Available in either polycarbonate or glass Four glazing colour options available Enhanced security options 20 year insurance backed guarantee trol l Get in touch for a fully comprehensive site survey & technical advice.
RCI July 2017
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