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Posted by Pipedown on June 13, 2008, 5:34 pm
> On 06/13/08 03:12 pm SteveB wrote:
>
>>> Now that we have removed the wet carpet from our basement floor, we
>>> can see a few cracks in the concrete.
>>>
>>> Although the recent mini-flood was caused not by water coming up
>>> through the cracks but by water overflowing into the house from a
>>> flooded window well, ought we to fill the cracks before laying new
>>> carpet or carpet tiles?
>
>> Let the concrete dry thoroughly. It may take a few weeks. You may need
>> a fan and a dehumidifier.
>>
>> Fill large cracks with mortar. Every slab has hairline cracks. Large
>> cracks, especially those where the two sides are different levels,
>> should be examined by a foundation expert.
>>
>> Seal all cracks with something like RedGard.
>
> Thanks for the reply.
>
> The cracks are little more than hairlines. Most of the floor already has
> some kind of coating on it, but I have no idea what it is. Will the
> RedGard work on top of an existing coating?
>
> Perce
I had a long crack in my garage floor. I just blew it clean with compressed
air and filled it in with sanded tile grout. In my case the maximum crack
width was about 3/4" with most of it under 1/2" the crack is over a decade
old so I am taking a chance it will not move more and open the crack again.
If I thought it would move, I would have used a flexible concrete caulk.
One year and still stable.
I would attempt to remove the coating before applying any new adhesive for
carpet, it sounds like residual adhesive. A floating floor may be OK if it
is smooth enough. A floor sander might work but if it is too gummy then a
solvent (like paint remover) and scraper might be in order first.
It is not necessary to have a dry surface for Mortar or Grout. For a tube
dispensed caulking product, read the label.
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