18
feature
hot topic
the FHS
Knauf Insulation
Three targets, but fabric comes first New homes must meet three performance targets. • The Target Emission Rate (TER) covers operational CO emissions. • The Target Primary Energy Rate (TPER) measures total primary energy use.
• The Target Fabric Energy Efficiency Rate (TFEE) assesses the thermal performance of the building fabric. It may appear that the fabric is only directly linked to the TFEE, with the TER and TPER addressed through low-carbon systems.
However, the influence of the fabric is broader than this. Insulation reduces the overall energy demand of the building and supports the effective operation of low-carbon heating. The maximum U-values in the Future Homes Standard and the updated Approved Document L remain consistent with those introduced in the 2021 Part L update. However, the guidance makes clear that these values are unlikely to be sufficient in many cases. Achieving the TFEE will often require tighter U-values across key elements of the building fabric.
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