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Hi all, We are into a new build and have a very thermally efficient and airtight design but have been told by our SAP assessor that for the new Part L regs they cannot use standardised psi values as they used to in the past for the thermal bridging calculations of timber frame builds. They perhaps can work them out manually but this may work out to cost around £5k… I can’t imagine we are the first to do this since the new Part L regs came out and have been trying to find values from the structural timber association and our manufacturer as has the SAP assessor. Has anyone come across this before or have an idea on a source for these potentially? I have looked at other forums, there is an interesting one from 2021 on Part L but nothing that seems to help. Thanks
The UK gov released their consultation into incrementally green building standards a couple of week ago - link here: https://www.gov.uk/government/consultations/the-future-homes-and-buildings-standards-2023-consultation/the-future-homes-and-buildings-standards-2023-consultation#scope-of-consultation I guess the main takeaways will be the probability of mandatory heat pumps and possibility of mandatory solar panels? I can't claim to understand fully the changes to SAP calcs. Just wondered what the feeling was around the proposals? Missed opportunity? Positive? Unambitious? All you'd hoped for?