INSULATION 61
Robust insulation remedies U
ntil very recently, the UK’s net zero strategy has been dominated by discussions on how we can roll out energy-saving technologies effectively, and our transition to renewable energy – leaving the fabric of our buildings somewhat overlooked.
While ECO+ may signal greater recognition of the role of the building fabric and specifically insulation in the fight against climate change – full details of the scheme are yet to emerge – it’s largely been forgotten that the cheapest, cleanest, safest energy is the energy we don’t use. To cut greenhouse gas emissions in line with the Paris Agreement, help households reduce their energy bills, and bring about a greener and more sustainable environment, we must address building performance – fabric first – and place more emphasis on how buildings perform not just when built but beyond. Changes to Approved Document L in England, introduced in 2021, place greater scrutiny on closing the gap between design and as-built performance, which is undoubtedly a step in the right direction. Yet performance gaps often occur in areas that can’t be seen. As such, we need more stringent monitoring of the build quality; in particular, ensuring properly installed, durable insulation is used to achieve the required performance once built and occupied.
The importance of fit
The first step in achieving this designed performance is to be certain that insulation is fitted contiguously and without gaps. Stone wool insulation makes this process easier as it is highly pliable so can be closely friction fitted, without the need for impractical levels of precision cutting. This simplicity minimises the margin for error, supporting reliable and effective thermal performance that reduces thermal bridging. This process also applies to abutments between insulation boards, another area
ADF MARCH 2023
Paul Barrett from ROCKWOOL UK outlines the importance of robust installation methods when specifying insulation, and why a more holistic approach is needed
Terence Smith Photography
that can be prone to thermal leakage. The composition of stone wool insulation allows individual slabs to knit together to create a seamless fit and the workable nature of stone wool insulation supports the delivery of designed U-values. For continuing performance, dimensional stability is key. Building materials naturally expand and contract over time which can lead to the formation of gaps and voids. Stone wool maintains its shape and properties over time across a wide range of temperatures, and has the resilience to accommodate building movement when fitted under compression. It has a proven ability to provide consistent performance – even up to 55 years – without a drop in its thermal properties. And because of its high-density semi-rigid composition, it will not slump in the cavity.
The role of innovation The UK’s drive to net zero must also be supported by building product manufacturers, leading a charge with innovation that delivers on thermal
WWW.ARCHITECTSDATAFILE.CO.UK The first step in
achieving this designed performance is to be certain that insulation is fitted contiguously and without gaps
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