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Originally Posted by papa smurf
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But would that be part of the planning docs?
At the planning stage you have to have faith that the architects and designers know what they are doing. The specifics of using certain materials is down to them.
Looking at the sectional views of the exterior walls you can easily see how the fire went to and fro between the inside and the outside. You have either 150mm of flammable insulation or window frames covering the outside of the building and little else.