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Old 04-11-2011, 02:55 PM   #16
Join Date: Dec 2007
Location: Wisconsin
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damp concrete floor in shop

Thanks for the explanation. I'm not so much worried about discoloration of the floor as I am about the tools rusting, although the damp sawdust on the floor is annoying when it gets into your shoe treads and gets tracked all over everything else.

Geez, and when they built the shop they asked me if I wanted a floor drain in there. Now I could use one for the dehumidifier but instead gotta run a hose into the garage....damn

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Old 04-11-2011, 03:45 PM   #17
Join Date: Mar 2007
Location: Long Island, NY
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damp concrete floor in shop

How long ago was the slab poured?
How long does it take to "give up it's water". I thought concrete fully cured in and a month, give or take.
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Old 04-11-2011, 03:51 PM   #18
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Location: Wisconsin
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damp concrete floor in shop

Is this always damp, or just this weekend with the extremely humid weather?

My shop floor was sweating for the first time that I've ever noticed yesterday. It's a heated floor with 2" of insulation & vapor barrier under it, and never sweats otherwise. But, the warm humid air yesterday, coupled with the cold concrete, certainly created a damp floor.

My 35 year old garage floor on the other hand, w/o a VB, literally had water running down it to the drain.

How warm are you keeping the shop in winter usually?
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Old 04-11-2011, 03:56 PM   #19
Join Date: Dec 2007
Location: Wisconsin
Posts: 339

damp concrete floor in shop

I'm guessing the slab was poured in early July. It didn't even sweat like that during the most humid days last summer.

Yesterday was extremely humid and yes, the garage floor was soaked. I guess my big mistake was opening the windows in the shop without realizing how humid it was outside. The let it all in and made it much worse.

The shop isn't always damp but I did first notice some moisture on the floor about a month ago when it was getting in the 40's outside, hardly a spring thaw at that point. I normally heat it to 55 or so, but only when I'm using it, otherwise the heater is completely off.

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