Hey,
The paint on the ceiling of my bathroom is peeling for the 2nd time in 5 years. The room is 68 sq. ft. and has a 70 cfm fan in the center.
5 years ago after scraping the ceiling clean, I primed it with Zinsser B-I-N shellac based primer and top coated with a semi-gloss oil based paint.
Ugh, now it’s all happening again. What would be a permanant fix?
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Replies
fix the exhaust fan. there is moisture inside the sheetrock forcing the paint off from the backside. the fan probably dumps into the attic, not ducted to the outside.
"Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
"fix the exhaust fan. there is moisture inside the sheetrock forcing the paint off from the backside. the fan probably dumps into the attic, not ducted to the outside."
What do you think is wrong with the fan? The fan exhausts outside through a vent in the roof.
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Any chance that there might be a small leak around the stack vent going through the roof?
J. D. Reynolds
Home Improvements
"Any chance that there might be a small leak around the stack vent going through the roof?"
No, the roof is fairly flat, and is torch down
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No, the roof is fairly flat, and is torch down
I will accept "no" if you have reasons aside from "fairly flat" and/or "torch down".
As in....you've checked.....or, its a relatively new roof.....or special attention was paid to the fllashing of the vent.
Flat is asking for trouble, and torch down never impressed me.
J. D. ReynoldsHome Improvements
Yeah, first guess would be that the fan's dumping the moist air into the attic and not outside. After that I'd suspect the fan is not being run when it should -- should have either a timer or a humidistat switch so that it runs for awhile after a shower.
If this is an old house (pre 1920 or so) then there's a chance that milk paint was once used on the ceiling, in which case you might as well just drywall over it.
"After that I'd suspect the fan is not being run when it should"
Fan is on a timer,,,,is the fan large enough?
House is 35 years old.
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Fan should be large enough. Minimum is 50 CFM, and that's "adequate" for a small bathroom. You said 70, IIRC, which should be plenty if the ductwork isn't constraining it. Is the fan used reasonably religiously and is the timer running at least 10 minutes after shower stops?But you say flat roof. I'm guessing that moisture builds up in the ceiling, possibly from fan leakage, possibly due to moisture going up studwalls, etc.Is there any pattern to the peeling? One area (center, edges, around fan, closer to shower) where it's better or worse?
So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin
What is the age of the house.
In the 20's and 30's there was a calcimue (sp?) coating that was used. It requires a special primer.
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A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.
House is 35 years old.
For good new rock music, click on: http://www.wolfmother.com
It may just be coincidental, but I've had trouble with paint lifting when applied over Zinsser's BIN shellac primer. The topcoat manufacturer (can't recall name) suggested their own primer, so we switched, and haven't had problems since. Some topcoats require a latex primer, and although we haven't used BIN underneath, we haven't had repeats of the problem when we use the latex directly over the wall board/plaster.
Gary W
gwwoodworking.com
I use BIN shellac primer frequently. Mostly to cover stains, which it does well. I'm reluctant to use it on large areas as the main primer because it is very non-porous. Although I've never had a problem with topcoats sticking to it, it seems like conventional primers (acrylic in most cases, oil for exterior/stain blocking) are better choices when priming large areas.