Hannah82w Posted January 7 Share Posted January 7 We are about to start lining and filling our stud walls and would like some advice on acoustic and normal cavity insulation please. Studs are either 150mm (6x2) or 100mm (4x2) wide, mostly 400mm centres (so the gap to fill is only approx. 350mm wide). Architect specified 50mm Isover APR 1200 insulation, but we're happy to look at similar products such as Rockwool and Knauf. How much of the stud wall depth should you fill? 50mm doesn't seem enough in either 100mm or 150mm stud depth. Do you need to leave an air gap or fill completely? All the products seem to come in 600mm width, with the exception of the Rockwool Flexi at 400mm, but more expensive. Am I missing something on the market that is made for 400mm centre studs or do you just have to cut down and expect wastage? Walls will then by lined with plywood and plasterboard. Thanks very much. Link to comment Share on other sites More sharing options...
JohnMo Posted January 7 Share Posted January 7 You need an air gap either side, assuming you are talking accoustic insulation. Everything needs to be cut anyways. We used Flexi it's good, for the wider studs we used 100mm and 4x2 used 70mm. 1 Link to comment Share on other sites More sharing options...
nod Posted January 7 Share Posted January 7 If it is for acoustic 25-50 is enough to stop the sound bouncing around 1 Link to comment Share on other sites More sharing options...
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