Were about to lay our insulation boards down 100mm pir boards this is being laid on top of the oversite. Some of the oversite isnt 100% level only 10mm out max in places do we level the ground with a layer of sand before putting the boards down? Or do we just lay the boards down and foam them down to the oversite?
Underfloor heating and insulation
- Thread starter Steted21
- Start date
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I’ve used sand for that, worked fine
Concrete over-site?
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