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  #16 (permalink)  
Old 07-01-2004, 07:24 AM
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another thing no-one mentioned, there is a chemical release from cement.once the floor is definately dry, it should be cleaned with an acid(muractic acid) the stuff bricklayers use .this will clean the natural residues caused by cement curing.not cleaning the floor properly wil cause early failure of any product. mike

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Old 07-01-2004, 07:41 PM
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I've been finishing concrete for the last 4 years. The curing time can very depending on climate. I live up north so slabs placed earlier or later in the year when its cooler will take longer to set which in turn take longer to cure. But generally 28 days in the warmer months. I agree with mikeweyman about the muriatic acid this will etch the floor allowing the sealer/paint to bond. This is a definite to do if a) the floor has some sort of concrete sealer already on it. And b) Machined floors (power troweled) can be as smooth as glass so the acid is needed so the paint can bite in. Just mind the fumes from the acid it will "smoke" when you apply it and its not good stuff to breathe in. Any kind of vapor barrier under the slab IMHO is a waste because the heat created when a slab is curing bakes the poly and will become brittle and crumble. All the slabs i've removed with poly under them have been like this.
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Old 07-02-2004, 07:33 AM
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Quote:
Originally posted by RippinRon
Any kind of vapor barrier under the slab IMHO is a waste because the heat created when a slab is curing bakes the poly and will become brittle and crumble. All the slabs i've removed with poly under them have been like this.
You know that and I know that but tell it to the County building inspector!
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Old 07-02-2004, 03:06 PM
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Originally posted by willys36@aol.com
You know that and I know that but tell it to the County building inspector!
A vapor barrier isn't required by code where i'm from. But its those few home builders we always do the floors for that you just can't tell them different. The thing that I really detest is the bleed water that has to come to the top now that there's poly underneath. I hate when it pools around low spots in the floor.
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