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I'm building a garden room and am about to build the timber floor frame. I will be insulating between the joists with foil-backed PIR board. I have seen many tutorials where the PIR board is installed flush with the top of the timbers, so that the plywood floor base lies on top of the timbers...

Hi there I'm planning to remove the greenhouse and build a garden room at the end of the garden: I'm not sure what to do about foundations though. I have patio to the left, a brick and concrete base under the greenhouse which is about 10cm higher than the patio, and grass in front, ie three...