My garage ceiling is the popcorn finished painted type and the walls
are stucco - textured like the outside. There was a line around the
corner - like the ceiling was separating from the wall. I patched it
Monday with caulk - it was the easiest way. It looked fine Tuesday.
Today I went out there and it was as though I hadn't done anything to
it. The line was back -- in most places. I went over it again. It
appeared to be o.k. - that was about 2 p.m. So I went out there just
now (6 p.m.) and its separating again. What is causing this? Did I
use the wrong thing to patch it? Its Dap silicone caulk.
Maybe you are putting on the caulk just a bit too thin. If not, where
are you located, any earthquakes or major temperature changes
recently? When there are temp changes, there are usually associated
moisture level changes, and wood can take a couple of months to dry
out or expand, depending on the moisture changes. I have a couple of
cracks in a bathroom wall that take 2 months to show up after the cold
weather hits in November. This year they were really late in showing
up because the moisture levels have not gotten as low as normal due to
the warmer temperatures.
On Wed, 11 Jan 2012 16:48:42 -0800 (PST), "hr(bob) firstname.lastname@example.org"
When the house is at it's driest, and the gap at it's largest, is the
time to patch it with a compressible filler. Anything else will be
wasted effort. If the gap is large, stuff it with something like foam
screen spline of the proper size (just big enough to need to be
stuffed in). Thermoplasic caulk may be better than silicone too -
might be too late for that.
I'd call the fire department immediately and get out of that house
until they check it out. It sounds like you are experiencing earth
shifting, or the house is slowly collapsing. Either way, you may be
living in serious danger if the place is moving within a couple hours.
I don't use silicone unless it is a wet area, but there are probably
silicone blends intended for other areas. My first thought is: are
conditions in garage suitable for the caulk (not too cold, etc.). Low
temp might keep caulk from curing. Old or newer structure, signs of
serious movement or settling? Size of gap also important...hairline or
1/2" gap? Wall and ceiling are painted? If it is hairline, or very
fine gap, a paintable latex caulk should fix the problem, assuming it is
not too cold (read the label). Putting something over the silicone
might be troublesome in re adhesion.
I think I found the problem -- the caulk I used was Clear. It went on
white and blended in with ceiling and wall - not a hairline crack but
only a little larger - and when it dried it was clear and didn't hide
the crack. I climbed up on the step ladder today and felt it - its
still a bit damp but the actual crack is sealed. I live in Florida
where its been damp the past few days - rained yesterday - and nothing
dries fast here because of the humidity. I will wait until it dries
and paint just the caulked part. Thanks.
Pure silicone probably isn't "paintable" (paint won't stick). Check the
label. For correction, since the seam isn't wide, you can probably cut
out the silicone (carefully, and not too deep) and then recaulk with a
paintable caulk that bridges where the silicone is now....even if new
caulk doesn't stick to the silicone, bridging the silicone would allow
the replacement caulk to stick on both sides and thus cover it.
Paintable latex (acryllic) caulk should be fine...needs to be flexible
(as opposed to joint compound or grout) so that flexing with normal
movement doesn't crack the caulk.
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