Mr Punter Posted August 10, 2019 Share Posted August 10, 2019 I have used XPS insulation which has a much higher compressive strength than EPS and PIR type insulation. I have used it on a garage floor under plastic tiles. Fairly cheap. Stuff like Foamglass is perhaps stronger but costs loads. Link to comment Share on other sites More sharing options...
Oz07 Posted August 10, 2019 Share Posted August 10, 2019 2 hours ago, Ian said: A 100mm thick concrete floor slab weighs about 240kg per sq metre Yeh that's about as far as my sums got before I had to rely on collective knowledge of forum to advance my understanding cheers @BuildHub Link to comment Share on other sites More sharing options...
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