About 4 months ago I built a fully tiled shower stall. The tile was
from Home Depot so for convenience we got the grout there too. It's the
Custom Building Products brand which also has the color matching sanded
caulk to look like grout in the edge seams. I caulked all major
surface joints - the walls and around the floor. Now the caulk around
the floor is slowly coming off as if it never fully cured. It crumbles
easily and feels like a dry paste, rather than the solid rubber you'd
expect, though it's hard to tell if the moisture in it is from the
caulk or just shower water. Has anyone with tile experience run into
this? Any suggestion for a remedy? I'd gladly go with a non-sanded
caulk with a reasonable color match if you can recommend better
Not sure as I've never had that particular problem with the sanded
caulking, but did you caulk *after* you grouted and thoroughly cleaned
the joints to be caulked? That's the correct way.
Also, what size are the joints? Also, the caulking may have been old
stock, or you didn't allow proper curing time.
I would certainly bitch at HD about it.
Nonsense. Spaced joints requiring sanded grout is used commonly in
showers and tubs worldwide.
Unsanded grout is used for joints smaller than 1/8". However it also
common to use sanded grout for 1/8" joints.
On the packaging sanded grout is recommended for any joint over 1/8"
and mine are 3/16" to 1/4". The reason I used sanded caulk was merely
cosmetic - which I guess is the only reason to ever use it. I do a
fair amount of paintingand have used many different kinds of caulk. In
my experience it never cures as fast as the manufacturer says it will,
even under perfect conditions (temp, humidity etc). In this case the
shower wasn't used for at least a week after I caulked. The only other
work was the silicone treatment of the grout which was done about 24
hrs after caulking. I guess if that somehow sealed up the caulk it
could affect its "drying".
What is crumbling.....caulk or grout? Sanded grout, if that is what is
crumbling, is generally recommended for joints larger that 1/16 or more.
I think the principle being the space is so small that too much of it
is occupied by sand and the mortar thus has no strength.
tileguytodd had written this in response to
Sanded Caulk Failure rates are Very high. They do not handle joint
movement very well as their elasticity is effected by the addition of
Professionally we have stopped using matching sanded caulks due to call
back rates to recaulk all changes of plane on new construction projects.
Sanded caulk rarely lasts 2 years.
We have gone to 100% Silicone caulk and while perfect matches are not
possible, Small caulk joints are not obtrusive and the silicone will
last many years before requiring maintenance.....Sanded caulk is a
FAILED product IMHO and I have over 20 years in the field losing money
nearly every time ive used it.....If a customer specifically wants the
product, I have a disclaimer regarding the product..... Mapei, Tec,
Colorfast...they are all Poor, some are worse than others but ALL fail
where even a small amount of elasticity is needed........
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