Laying a concrete floor with two levels of dpc

Postby tannoy » Thu Sep 11, 2008 10:26 pm

Hi everyone, I'm laying a 4" reinforced concrete floor on a dpc membrane.

On top of that I have read I need to put another dpc before I put 4" of floor styrene to which I'm adding water underfloor heating and then a 4" screed to finish off.

My question is how long to let the first four inches dry out before I put the next layer of dpc. I read I need this dpc to protect the polystyrene. If I cover it before it's completely dried right through will I have problems because the moisture is trapped in or will it eventually dry out. Any advise is gratefully received. Thanks
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Simply Build It

Postby mdpmspitfire » Wed Nov 26, 2008 10:17 pm

i would suggest you allow several weeks to allow drying as you are right that the moisture will be trapped. using a dehumifier on a low setting would help but dont dryout too fast. air circulation is best but this time of year and damp air doesnt help
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