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    Insulating internal stud wall

    I have a internal stud wall using 4x2 timber. Can I completely fill the void using 100mm think insulation or do I need to allow for any air flow? Thanks.
  2. D

    What insulation to use for external timber wall

    My 1970's house has external timber walls upstairs. The walls consists of the following elements, from outside in: 1) PVC cladding 2) Felt (Looks like roof felt) 3) 4x2 timber studs 4) 50mm polystyrene (as insulation) 5) 6mm plywood I was considering replacing the polystyrene...
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