46 STRUCTURAL ELEMENTS; EXTERNAL ENVELOPE


Non-combustible insulation in flat roof design should be


considered best practice Reducing risk


While the tests required to achieve a BROOF


(t4) rating consider surface spread of


flame, penetration of the roof membrane, and the presence of droplets or charring – they do not subject the roof system to a fully developed fire, nor do they consider fire penetration from the underside. BROOF


attachments to buildings covered by Regulation 7 (A2-s1, d0).


A simple and straightforward way to determine the combustibility of a building product is by checking its Euroclass reaction-to-fire rating, which can be found on the product’s declaration of performance.


(t4) is achievable by virtually all


commonly-available roof build-ups on the market, even those that incorporate combustible insulation with a reaction-to-fire rating as low as F. As such, it’s important to note that a


BROOF(t4) rating does not define the


combustibility of the component parts of a roof system – including the insulation. Therefore it cannot be used alone to satisfy requirements that are defined by Euroclass reaction-to-fire ratings, such as those in ADB concerning the crossing of compartment walls (A2-s3, d0), or


Delivering gas protection solution


When it comes to the challenge of waterproofing and gas proofing a below-ground structure, Newton Waterproofing Systems, a leading independent designer and supplier of guaranteed waterproofing systems, stock a range of products that combine effective


waterproofing and gas protection. Newton has a range of products that meet the necessary standards for use as protection against below- ground gases. For more information on combined gas and waterproofing systems, the industry-qualified Newton technical team can provide project-specific advice and product recommendations.


01732 360 095 info@newtonwaterproofing.co.uk Concrete results for Crittall


A listed art deco building exemplifying reinforced concrete construction has been refurbished with Crittall Windows helping to ensure its original appearance was maintained. Victor House was built in 1937, designed by architect Peter Lind, as a headquarters for the British Reinforced Concrete Engineering Company on the site of its extensive cement works at Pitstone, Leighton Buzzard. When the cement works closed and was subsequently demolished Victor House survived as the only original building on the site. At this point it was purchased and refurbished by property company LaForet. After initial use as an office for a legal firm the building became vacant but failed to re-let. Also, single glazed windows contributed to large heating bills. LaForet sought permission to convert the offices into eight apartments and architects EHW Ltd carried out negotiations with local planners who insisted that the upgraded double glazed windows should match the original fenestration as closely as possible. Crittall Corporate W20s, finished in white, were specified as a result. The building has been renamed Portland House as a reference to its original connection with the manufacture of cement.


01376 530800 www.crittall-windows.co.uk


Safeguarding compliance In a bid to reduce fire risk and minimise room for installation error, industry is starting to adopt a simplified approach to insulation design, using a non-combustible material across the whole flat roof area. This proactive approach brings tremendous benefits. Designers can futureproof buildings and specifications against a changing regulatory landscape, and there’s the potential for efficiency gains onsite by removing the need for close coordination when using a combination of different insulation materials. But above all, architects and their clients can be assured they are also providing a safer environment for future building occupants.


Will Wigfield is flat roof product manager at Rockwool


Sto creates insulated brick slip facade


A combination of external wall insulation and resin brick slips from Sto has helped create a thermally efficient and visually striking appearance for a £7.8m residential refurbishment project. Located on the Stockwell Park estate, Tyler House now


benefits from the use of Sto resin brick slips which have been installed as the final facade finish, onto the company’s StoTherm Mineral K external wall insulation system. The BBA-certified StoTherm Mineral K insulation system is ideal for refurbishment projects. Its external installation means that insulation performance can be substantially upgraded without the loss of any living space inside the premises.


0141 892 8000 www.sto.co.uk


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ADF JANUARY 2022


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