Originally Posted by
Jerry Peck
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No basements here either, but from the looks of it, like Rick said, it appears to be seeping through up from inside the tackless strips.
I'm guessing that the footing was poured, the basement foundation walls placed and poured on top of the footing, then the basement slab poured inside the inside perimeter of the footing, leaving a cold joint, and an unsealed joint, all the way around the basement inside edge of the footing where the slab was poured to.
My thoughts exactly. I've seen floating slabs here in some garages where moisture has seeped up at the edges. Like others have said, joints not sealed properly and raised water table has probably caused the problem.
I'd be willing to bet that the concrete floor is not much more than 4in. thick and possible driving in the tackstrips created some small stress cracks that could be possibly allowing the seepage.
Over the years, I've seen actual termite tunnels coming up below small cracks below the tackstrips. If they can make it through so could moisture.
rick