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Building Regulations Continued from page 62 rooflights must be undertaken by an approved UKAS accredited product certification agency, who will calculate accurate thermal performance figures based on the individual make up of components in the product’s construction. A bird’s eye view of a project’s roof windows For rooflights, U-values should be calculated based on a horizontal position. Further guidance in the Building Research Establishment’s BR 443 tells us that U-values for roof windows and rooflights are usually quoted for in the vertical plane. This allows comparison of different products that could be used at different inclinations. However, for the purposes for calculating heat losses from buildings, U-values should relate to the plane of the component as installed in the building. This can be done by calculating the U-value of rooflights and roof windows, allowing for the angle of the roof in respect of both surface resistances and gas space resistances. Alternatively, the following adjustments can be made to U-values assessed for the component in the vertical plane (see table 1, below). What is the best U-value that you are likely to achieve? It is important to understand that there is much ambiguity surrounding rooflights, skylights and roof windows and the U-values quoted by various manufacturers. The much-coveted U-value figure has become a powerful sales tool for those claiming to be ‘the best performing’ or ‘most thermally efficient’ rooflight on the market, and you will often see figures advertised that are misleading at best, at worst, completely untrue! Some companies might even try and confuse you by quoting the centre pane figure for the glass, rather than a whole frame U-value, which is the legal requirement. In any case, caution is advised when researching the various products available and you should always request evidence to support the thermal performance claims made. U-value calculations for roof windows and Given that Stella use only the finest quality materials in our manufacturing process, from the highest specification glazing, to our high quality handmade hardwood liners, through to the best quality rubbers and seals, we are confident in claiming that our roof windows are among the best performing on the market, with our triple glazed, fixed product achieving a U-value of 1.1 W(m 2 K). A huge caveat for conservation properties – exemptions for historic and traditional dwellings While it is not always the case, it stands to reason that the majority of conservation rooflights are installed in traditional properties, barn conversions, and Listed buildings. If your project involves such a property, you may find that there are exemptions to these new regulations. The Approved Document states that the energy efficiency of historic and traditional dwellings should be improved only if doing so will not cause long-term deterioration of the building’s fabric or fittings. New extensions to historical and traditional dwellings should comply fully with the energy efficiency standards, unless there is a need to match the external appearance or character of the extension to that of the host building. In which case, the work should comply with standards in the approved document to the extent that it is reasonably practicable. In determining whether full energy efficiency improvements should be made, the building control body should consider the advice of the local authority’s conservation officer. Table 1 Contact Stella Rooflight: 01794 745445 www.stellarooflight.co.uk/ @StellaRooflight 64 TI APRIL <strong>2022</strong> PRACTICAL CONTENT FOR THE GLAZING INSTALLER & HOME IMPROVEMENT SPECIALIST
Introducing the strongest, most thermally efficient and quickest to install flat roof orangery system on the market. FAST INSTALLATION Factory fabricated in the UK, designed for quick assembly as standard STRENGTH Incredibly strong with large unsupported spans PEACE OF MIND Building Regulation approved (JHAI) NEW BUILD OR RETRO FIT The ILite roof is perfect for either application QUICK 10 DAY LEAD TIME Quotations returned within 24 hours Interested? Get in touch with our sales team today - 01772 802009 www.supaliteroof.co.uk | sales@supaliteroof.co.uk
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April 2022

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