Concrete slab weeps moisture
How should I treat a concrete slab floor in my home,
that has been weeping moisture, moreso after heavy seasonal rains?
Doubtfull it's a plumbing leak under the slab, but it hasn't been ruled
out 100%. I discount this because of no evidence of pooling of
water around the foundation. Plus, as the rain has diminished this season
and the overall soil in the region has started to dry out, the weeping moisture
coming up through the slab has lessened.
This is a master bedroom, groundfloor, concrete slab, San Diego, clay soil,
with sand and cobblestones. Typically San Diego gets little rain so it hasn't
been a major problem, except this year.
We've lived in the house for almost 2 years. House built in 1977.
I've taken steps to better cope with run off through the overall property....new gutters etc.
After noticing dampness, and musty odor in the room, I pulled back the
wall to wall carpet. The slab has evidence of efflorescence (white powdery, salts, mineral crusts) in some areas. Looks like it has been weeping on and off for some years. Overall the efflorescence isn't too heavy. There is one a yard long fissure that has been spalling, the concrete has been slowly
flaking away (about 1/4 inch deep)....there is moisture at this point, soaking into the carpet pad and coming up to the carpet. Right now it is about 2 feet away from the wall. I hope this condition isn't reaching the walls....at the moment doesn't look like it is.
Ruling out any structural problems from a cracked slab (which is another matter) the major problem is this spalling fissure, damp, with efflorescence building up.
I want to seal up this floor with something that will keep moisture out and re carpet. I've been recomended - trying several coats of dry lock concrete paint or DecoRez two part system.
Any ideas about what to use to patch and seal such a condition?
Thanks for your attention.