naf123 Posted August 13 Share Posted August 13 Hello 225mm difference between garage and house (garage is lower) Planning to double up on 100mm celotex insulation followed by t+g. Is there any reason not to do that ? The other option which I don't want to do is 100mm celotex and 100mm screed . Thank you ! Link to comment Share on other sites More sharing options...
joe90 Posted August 13 Share Posted August 13 You don’t say why you are doing this, is it safe to assume you are converting the garage into living space? Link to comment Share on other sites More sharing options...
naf123 Posted August 13 Author Share Posted August 13 Correct , it will be a living space - an area of very low use eg office or bedroom . Link to comment Share on other sites More sharing options...
joe90 Posted August 13 Share Posted August 13 Garage floors tend to not be flat with a slope to the door to aid any leaking fluids to escape. So you need to work out how to lay a flat floor. Personally I don’t like floating floors but if you used 22mm caberdeck (t@g chipboard flooring) which is quite heavy on top of the insulation it should work well. 1 Link to comment Share on other sites More sharing options...
naf123 Posted August 13 Author Share Posted August 13 Yes we do need to pour thin screed on the garage floor to make it 100% level then dpm then double PIR then 22mm t+g - thanks for the suggestion of caberdeck . I may actually use EPS under the PIR if it saves some money . Thanks for advice ! 1 Link to comment Share on other sites More sharing options...
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