Too much moisture in concrete slab
Too much moisture in concrete slab
(OP)
Is it possible to dry out a 300mm thick 30MPa concrete slab with a 25mm polystyrene layer and 75mm screed on top already in position? Area under question - approximately 70m^2. Being an HVAC specialist, the engineer asked me - all I can think of is to de-humidify and heat the air below the slab - apparently this is not an option and work has to be done from above..... Any suggestions?





RE: Too much moisture in concrete slab
Once the RH is below 75 percent, the slab is considered acceptable for floor coverings.
RE: Too much moisture in concrete slab
Dik
RE: Too much moisture in concrete slab
Does bad builder count as a source....?
I think the waterproofing was done before the moisture could dry out from the slab. Not 100% sure. If I'm correct, we must assume that the slab has cured but not yet dried out to satisfactory levels before the builder sealed it on top with the polystyrene layer and screed - in principle the moisture inside the concrete is trapped - well, almost, since in can evaporate to below, but surely very very slow?
RE: Too much moisture in concrete slab
Dik