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It is a new build and the cavities have 100 mm of insulation and currently the roof space will have 270 mm which can be bumped if necessary.

Hello, I've got a new extension which is currently being plumbed and eventually it will be plastered etc. I have a question regarding heat retention for outside walls. All the new radiators are on outside walls and the new bedroom upstairs has three outside walls. On two of these walls I have...