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INSULATION
Steel faced PIR core insulated panels can readily achieve the required U-values with minimal thickness
Measuring compliance
The National Calculation Methodology (NCM) remains the means by which compliance must be demonstrated, with an updated version of the Simplified Building Energy Model (SBEM) available to calculate aspects such as the Target and Building Emission rates (TER/BER) as well as the Target and Building Primary Energy Rates (TPER/BPER).
The introduction of the Primary Energy rate as an additional metric by which performance is measured was one of the most notable changes. The metric applies a fuel factor adjustment to the energy used, accounting for upstream activities to prepare the fuel for use, this includes steps such as extracting, refining and transporting fossil fuels. The primary energy demand for a building also factors in the fabric performance of the building and the efficiency of the heating technology used. Carbon emissions were also retained, allowing some consistency in the benchmarking process – both metrics must be met for a building to comply. Interestingly, amendments were introduced in February 2023 to remove the Primary Energy factor as a performance standard where district heat networks or community heating is being used. Buildings with a useable floor area of 500 m2 or more must be subjected to pressure testing to assess air permeability. As the building envelope becomes more efficient, thermal bridging becomes a more significant factor, so ADL2 (England) requires accurate calculations of the psi values at junctions and penetrations, with a 50% penalty if assumed psi values are used instead of project specific calculations. To support this approach accredited details were removed.
Complying with Part L
Steel faced PIR core insulated panels readily achieve the required U-values with minimal thickness. For example, the minimum U-value for a flat roof is 0.18 W/m2
.K, 0.16 W/m².K for pitched – a
typical trapezoidal insulated panel can achieve 0.16 W/m2.K with just 120 mm thickness. The single unit panels ensure insulation continuity, and manufacturers can often provide detailed psi values to use in building energy modelling, helping to avoid penalties.
Chris Pateman is general secretary at EPIC
WWW.ARCHITECTSDATAFILE.CO.UK ADF JULY/AUGUST 2023
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