What Is This on my ceiling?


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Old 04-08-22, 04:02 PM
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What Is This on my ceiling?

We have noticed these marks developing slowly on our kitchen ceiling since we bought our house about 6 months ago but I don't know what they are. There is a toilet directly on the floor above this, but I don't know if the drainage pipes from that would run laterally through the floor or if it's leaking from the base. Anyone have ideas? The toilet regularly makes a hammering noise when we flush it, if that helps.



 

Last edited by PJmax; 04-08-22 at 04:10 PM. Reason: added highlighted picture
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Old 04-08-22, 04:12 PM
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Typically water causes dark stains. That looks like the paint is bubbling.
More than likely caused by water too.

You could have a defective wax seal on the toilet. That would allow water to leak into the ceiling.
 
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Old 04-08-22, 04:13 PM
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I doubt this is related to the toilet...

Looks like a contaminate was on the ceiling that was not cleaned before they painted over it, and the paint didn't stick in those spots. Get up on a ladder and poke one and see if it is like a blister that you can pop and flatten back out. That will tell us more about it.
 
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Old 04-09-22, 08:52 AM
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Thanks! It appears to be water damage, possibly from the toilet above? My husband poked one of the bubbles and his finger went right through.
 
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Old 04-09-22, 09:40 AM
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Yes, water damage. Most likely from a bad toilet flange. You might be able to get a warranty for damage. Depending on how the house was sold. Call you your home owners insurance. You might be covered. (Just a side note, never seal the floor section around a toilet, even though code requires it. If it leaks you want to be able to see it.)
Best to remove toilet, inspect the whole area around floor. If it seems like it's just wet, but not soaking or molding the wood then let it dry out completely. Be prepared to replace ceiling wallboard on room below. If you're not handy in this regard, best to call a plumber and a drywall boarder.
 
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Old 04-09-22, 09:49 AM
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never seal the floor section around a toilet, even though code requires it. If it leaks you want to be able to see it
I always caulk the bottom of the commode except for the backside. That way you get the clean look and if the wax seal leaks the water will be able to go out the back. If it's sealed all the way around the leak has no where to go except into the framing and whatever is below.
 
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Old 04-09-22, 09:53 AM
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Mark, I agree with you. But not all toilets are absolutely level. And if a leak occurs it may take time for the leak to appear in the back side. Besides at home, I would think people would be able to keep the floor clean enough so that dirt and crud would not accumulate at the base.
 
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Old 04-09-22, 12:47 PM
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Thank you all! This is very helpful. The front and sides are caulked but I just looked and it seems that there is some rusty discoloration around the base. We should be able to have a plumber out in the next few days to confirm.
 
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Old 04-09-22, 04:35 PM
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Someone must have done a paper thin repair over it just to sell it... if its drywall you shouldn't be able to just push your finger into it.... drywall is 1/2" thick and doesn't just disappear if it gets wet. Or is it plaster?
 
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Old 04-10-22, 02:26 AM
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As noted drywall is typically 1/2" thick and many ceilings are 5/8" At any rate any drywall you can push a finger thru needs replacing. I would think if it was plaster it would come off in chunks. Water damage leaves brown stains but if someone primed the stains and did a superficial repair that would hide the stain. I'd plan on cuttting out and replacing all of the weak drywall.
 
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Old 04-10-22, 08:36 AM
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Yeah the material seems to be paper thin. Almost cardboard-like? I know many of the walls are plaster since it's an older home but not sure about the ceiling.
 
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Old 04-10-22, 10:01 AM
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How old is the house? older homes have lath, brown coat and plaster coat all added together makes it fairly thick. Newer homes [last 40 yrs or so] use a thin plaster veneer over blue board drywall. It wouldn't be uncommon for an older plaster house to be repaired with drywall. I've never seen damaged plaster that you could easily stick your finger thru.
 
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Old 04-10-22, 12:26 PM
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remove the toilet and flooring around it like was stated above... some types of underlayment rot quickly. I had to replace a 4x4' section after I found a seal leak. Replace it all now and it should be good for many years. Your ceiling should also have a large area replaced, but your comments about how thin it seems causes concern. If you can't do it yourself, have a decent handyman with sheetrock experience do it, and cross your fingers that the entire ceiling is not thin fiberboard.
 
 

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