Drying Concrete or Suppressing Moisture

Screwed · 2 Dec 2008

Hi All,

Had our concrete tested to see if it was dry and it isn't. Need to either dry it out before the floor comes on the 15th or put a moisture suppressant on it. Don't really want to start "boiling" the room as we've just had it all newly plastered.

Something called "CREOM" has been suggested to me but this is over 100 quid for 5L. Anyone else got ny other suggestions? Don't B&Q do any similar moisture suppressants?

Many thanks.

Screwed · 4 Dec 2008

Morning All,

Anyone know if I can get a concrete sealant in B&Q that would do a suitable job of sealing recently laid concrete before fitting a floor?

Many thanks.

mattysupra · 4 Dec 2008

creom is the cheapest on the market as you can put the lid back on and re-use for a second coat. Epoxy sealers need two coats and you cant part mix so this will cost you double. And no, B&Q etc dont do any seals cheaper that work . There is one they sell but the floor has to be under 75%rh in the first place so pointless really.

What are you fitting and what is the moister content at the moment?

^woody^ · 4 Dec 2008

Is this a new floor?

Wont you be sealing the moisture in between the two membranes if you coat the top

Can't you ventilate and get a fan going in there, or a de-hiumidifier for a few days

mattysupra · 4 Dec 2008

^woody^ said:
Is this a new floor?

Wont you be sealing the moisture in between the two membranes if you coat the top

Can't you ventilate and get a fan going in there, or a de-hiumidifier for a few days

woody, the way these liquid dpms work is they still allow new concrete to dry out but at a very slow rate. It is good for the concrete as it will dry harder than normal over the years. Alot of people dont know, but you should sheet over new concrete when first laid for a few weeks to allow it to gain strength and reduce it shrinking and cracking . This never seems to happen tho!

Screwed · 5 Dec 2008

Hi,

Yep new concrete (approx 6-7 weeks old). The floor is engineered oak, being delivered Monday and fitting starts on the 15th.

Am going for Creom as there is somewhere local that stocks it, 114 quid for 5L though!!

Cheers!

^woody^ · 6 Dec 2008

So is this Creom a proper DPM? The blurb says its a "moisture suppressant" which does not seem to be the same thing

mattysupra · 7 Dec 2008

more of a suppressant. Its not like epoxy dpm that dries like a sheet of glass but is absorbed by the concrete and dries clear ( you cant see where you have done after it dries ) You cant use creom over quarry tiles etc like epoxy either. But the stuff does work and will allow the concrete to dry, but will take maybe 10 years compared to 6 months or so.

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Drying Concrete or Suppressing Moisture

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