![]() So they perform a really valuable (really annoying) role. ![]() I still get picked up on oversights on my drawings by building control (building standards officer), which have to be fully checked and comply before starting any work in Scotland, despite the fact that I generally design well above building regs set values. Agree with djh that we should be looking beyond BRegs, on this forum. Life would be so much easier without building control, but we'd have even worse buildings than the rubbish that's been built in the past, and all too often still today. The only thing that would get you near 0.3 (and not quite there anyway) would be phenolic foam, unless you have very deep pockets and go with Aerogel (Spacetherm). 1/1.323 = 0.755 = the U value, so less than half as good as the Building Regs would normally require. Calculate the R value of the Bauwer Light by dividing the thickness (0.05m) by the lambda value (0.068) and you get 0.735m2K/W. That equates to and R value of 1/1.7, or 0.588. 225mm solid brick it will be deemed to have a base-case U value of 1.7W/m2K. If I remember rightly Bauwer Light has a lambda value (thermal conductivity) of 0.068W/mK. There are some 'get-out clauses' for old houses built (as yours will have been) of water-vapour-permeable materials, but you have to apply for a Building Notice anyway, and argue for a waiver/'dilution' if applicable. 50mm of Bauwer light will not reach that. Have you spoken to Building Control yet? When you add or replace a layer to a thermal element such as an external wall (whether that layer is internal or external) you 'kick in' Part L1B of the Building Regs, which for a solid-walled house requires a U value of 0.3W/m2K. '' The house is not huge so I don't want to lose too much wall so I would go about 50mm thick maximum.''
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