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Our house was built early 1940’s, concrete floor with concrete block walls + skim coat.
The house has 4 support columns by 3 support columns, 1 or 2 look as though they were added after the construction was completed. I recently painted the basement floor with a Benjamin Moore concrete floor paint. about two weeks after applying two coats, the paint around 3 of the support columns started to bubble & blister. Also I noticed a white residue under the paint blister in some areas, not all.
Could someone offer some help + possible solutions on how to fix this problem.
PS – a new column was added recently, the ground was dry and compacted under the new column.
Mike brown
Replies
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Could be a couple of reasons. Had it been painted before?
If not it sounds like moisture is leaching up beside the
posts (it doesn't take much) and the white you see is
efflorescence caused by salts present in the concrete after
the water evaporates. Is there newer patches of concrete
around the posts?
It could also be residual efflorescence, where it didn't get
completely prepared before painting.
You might try the old poly and duct tape test to see if you
have moisture. You may get by with prepping the bad areas,
waterproof, then repaint. You may have to acid-etch the area
for better adhesion and to neutralize the alkalinity in the
area.
This is one opinion anyway :) hope it he
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Barry - thanks. In answer to your question, it appears as though paint had been applied around at least one of the posts. Part of the problem is, 1 or 2 or the columns may have been put in after the construction was completed. The other part of this discussion that is not making sense to me, if 2 out of the 4 columns expereince bibbling, why wouldn't the 3rd & 4th column - assuming water would be present across the whole area, or is this my misconception?
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Our house was built early 1940's, concrete floor with concrete block walls + skim coat.
The house has 4 support columns by 3 support columns, 1 or 2 look as though they were added after the construction was completed. I recently painted the basement floor with a Benjamin Moore concrete floor paint. about two weeks after applying two coats, the paint around 3 of the support columns started to bubble & blister. Also I noticed a white residue under the paint blister in some areas, not all.
Could someone offer some help + possible solutions on how to fix this problem.
PS - a new column was added recently, the ground was dry and compacted under the new column.
Mike brown