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Use 4x2 timber to build the stud wall. leave 18 inches between the centre of each board. Sheet the inside wall where washing machine is with 1 inch plywood or polystyrene backed plaster board. Fill cavity with roof insulation..pack it in tight.. or polystyrene sheets. Sheet "new wall" with plaster board. EDIT>> DONT FORGET TO LEAVE OPENING FOR DOOR!!!!!
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