Insulating a warm pitched roof to new regulations in 2024, I am building a warm pitched roof to the new standards as set out in Part L of the Building regulations
I am looking for 0.11 and to achieve this we are using Recticel PIR with a solution that was calculated from their online calculator
We are 100mm on top of the rafter and 100mm in between rafter, our rafter is 45mm thick, 175mm tall and at 450mm centres

It is well worth planning this out well when designing a roof for maximum efficiency in terms of performance, build ability, and cost etc



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