66 INSULATION Taking the long view
Simon Storer of the Insulation Manufacturers Association (IMA), explains why a fabric-first approach to design, combined with a long-term outlook, is the way forward to improve future building performance and cut emissions
failure, and is one of the simplest and most cost-effective ways to reduce energy
demand and cut CO2. The thermal performance of a building envelope makes a significant contribution to reducing the overall building energy usage – so tighter U-values in walls, floors and roofs will help to deliver the standards required. With lambda values as low as
It would be scandalous if homes being built today become the homes in 2050 that need to be retrofitted
uilding for the future, with legacy in mind, is a major challenge for all architects. Faced with the ambitious net zero target for 2050, the sensible approach is to make the right choices that not only meet but exceed future standards, while not compromising on materials. The role of PIR and PUR insulation in achieving energy efficient buildings and a sustainable future cannot not be underplayed. Good insulation is essential if homes and buildings in the UK are to become more energy efficient and sustainable, and offset some of the increasing energy costs and climate change conditions. The fabric-first approach to energy efficiency prioritises insulation within the building envelope, significantly restricting air leakage, which in turn prevents heat loss.
B
Using PIR insulation with high thermal efficiency will make a big difference between a building’s performance success or
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0.021 W/mK, PIR insulation is available as boards, blocks and composite panels, and PUR as spray and cavity injected insulation. Performance can be achieved with products that are thinner than many other commonly used insulants. In short, designers can achieve the highest insulation values from the minimum thickness of material, which in turn maximises floor space. PIR insulation products are widely used on residential, commercial and refurbishment projects because of their exceptional insulating properties, high strength and light weight.
‘Build back better’
While many more affordable homes need to be built to an overall higher performance level to reduce costs and emissions, all homes need to be finished to a much better build quality. We must reduce or better still eliminate the performance gap between design performance and what is built. This is why competency in installation is
vital, because when a high performing product such as PIR/PUR is not installed correctly, the thermal performance will not be maximised, and the full benefits not realised. Contractors need to make sure that not only the levels of site supervision are of a good standard, but the manufacturer’s installation instructions are followed to avoid issues around potential cold thermal bridges and awkward details. Once the high-quality building fabric has been completed, there should be no need to worry about it over the life of the building.
ADF JULY 2021
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