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re: Wet spot on ceiling help

Posted on 7/31/24 at 1:34 am to
Posted by windmill
Prairieville, La
Member since Dec 2005
7410 posts
Posted on 7/31/24 at 1:34 am to
The fact that you say no water is on the opposite side of the spot is what makes me think of condensation. I'd keep an eye on it to see if it gets worse or not. You might want to check that register and see if it is set to the utmost up position. If so I would adjust it to a more downward position. This is not a bad problem financially speaking. A bit of a nuisance. Good luck with it.
Posted by King of New Orleans
In front of The Hungry Tiger
Member since Jul 2011
10386 posts
Posted on 7/31/24 at 1:36 am to
Thank you! The help was much appreciated!
Posted by Hondo Blacksheep
Member since Jul 2022
2805 posts
Posted on 7/31/24 at 1:36 am to
Though sometimes moisture migrates along a beam too
Posted by King of New Orleans
In front of The Hungry Tiger
Member since Jul 2011
10386 posts
Posted on 7/31/24 at 1:37 am to
Didn’t see any beams with moisture on them.
Posted by lockthevaught
Member since Jan 2013
2598 posts
Posted on 7/31/24 at 1:55 am to
Maybe a squirrel pissed in your attic?
Posted by Gee Grenouille
Bogalusa
Member since Jul 2018
6761 posts
Posted on 7/31/24 at 4:22 am to
Gonna have to get up there while it’s raining.
Posted by jmcwhrter
Member since Nov 2012
7195 posts
Posted on 7/31/24 at 4:36 am to
Chance the leak is elsewhere and water is running down a rafter before dropping on that spot?
Posted by Northwest Louisiana
Northwest Louisiana
Member since May 2018
2258 posts
Posted on 7/31/24 at 4:49 am to
I’ve had that happen from the rubber boot on an exhaust pipe that goes through the roof. Replace them with the lead ones, the rubber ones are bad about leaking.

Fix the leak first, then get a clean spray bottle, mix it around 30% bleach / 70% water. Spray this on that water spot on your ceiling. The water spot will disappear when it dries.
Posted by AwgustaDawg
CSRA
Member since Jan 2023
11429 posts
Posted on 7/31/24 at 5:11 am to
slow leaks are tough to pinpoint. Good luck.
Posted by Tigerpaw123
Louisiana
Member since Mar 2007
17632 posts
Posted on 7/31/24 at 5:35 am to
Leaking roof jack?
Posted by LSUfan20005
Member since Sep 2012
9013 posts
Posted on 7/31/24 at 6:47 am to
quote:

had that happen from the rubber boot on an exhaust pipe that goes through the roof


This also came to mind for me.

If the ceiling is Sheetrock, it takes time and intensity to soak through. If it was condensation, that’s a very specific/localized amount.

OP, if you can get up there, put a baking pan in the attic where you found the moisture, check it every 3 days and you’ll know if it’s falling or not.
Posted by YahooSerious
(Chack) Bay Area
Member since Apr 2023
4 posts
Posted on 7/31/24 at 6:51 am to
Registers have been mentioned but it could also be “leaking” AC ducts. Especially rigid metal ducts with old insulation that is no longer airtight. Humid air gets to the cold metal and condensation occurs, which eventually drips. This is also consistent with the 4”x1” shape.

Not relevant, but on cold days I have seen roof nails collect condensation and drip, though that typically wouldn’t be enough to reach the ceiling.
Posted by DRock88
Member since Aug 2015
10020 posts
Posted on 7/31/24 at 11:39 am to
A/C ducts can sweat a good bit in a hot, humid attic. This sometimes ends of breaking down the duct, which then becomes a leak. The insulation may not seem wet because the leak just kind of runs right through it.

I had a similar issue that nobody could really figure out. Pretty much brand new roof that no roofer could find leaking. When replacing my AC I said, what the heck, let's do the ducts too. I haven't had an issue since.
Posted by King of New Orleans
In front of The Hungry Tiger
Member since Jul 2011
10386 posts
Posted on 7/31/24 at 12:13 pm to
Should I worry about it or just keep an eye on it? I just had the roof completely replaced about 6 years ago. Haven’t had any issues since.

Like I said, we got rain almost daily last week or so and never had a spot show up. First time I saw it was last night.

No pipes in the area of the spot either.
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5609 posts
Posted on 7/31/24 at 12:16 pm to
You mentioned no pipes in that area, does this include vertical vent stack PVC pipes that go through the roof?

When I had a similar problem, the rubber boot on the roof for a vent stack was slight deteriorated-dry rotten and apparently water dripped down the top of the vent stack boot, along the vertical PVC vent stack, then horizontally along some addition PVC under the insultation, before dripping on ceiling - it was also a small spot and didn’t seem to a re-current event with each rain.
Posted by King of New Orleans
In front of The Hungry Tiger
Member since Jul 2011
10386 posts
Posted on 7/31/24 at 12:25 pm to
Literally the only thing in the attic above this spot is “saw dust” style insulation. Not sure if that’s the right term. Also, just rafters and support 2x4’s, then the roof itself.
Posted by beauxgy
LA
Member since Feb 2007
3830 posts
Posted on 7/31/24 at 12:50 pm to
Water alarms are available and inexpensive. I have one next to my water heater. It's pretty sensitive when I tested it. Mine has a sensor attached to a wire that you can position wherever you need it.

Water alarm


Per your screen name, eta, falling bullet from July 4th?
When I worked in downtown Nola, saw a bunch of bullets on a guys desk. He said they found dozens after New Years and July 4th every year.
This post was edited on 7/31/24 at 12:59 pm
Posted by King of New Orleans
In front of The Hungry Tiger
Member since Jul 2011
10386 posts
Posted on 7/31/24 at 1:13 pm to
Haha I’m in BR
Posted by KemoSabe65
70605
Member since Mar 2018
5499 posts
Posted on 7/31/24 at 2:03 pm to
Had a water spot in living room i could never find in the attic, until the sheet rock co-lapsed while i was watching tv.
Called a roofer client and he came out and found a nail that didn't hit a rafter that had worked it's way out of the shingles. Would get a pair of binocs and scan the roof over the leak.
Posted by Tiger Dan 16
Central City, New Orleans
Member since Jul 2024
112 posts
Posted on 7/31/24 at 2:31 pm to
how old is your house? and how many floors?

if it was built in the 80's and 2 stories. the AC drip line likely runs into the main drain line that starts in the attic. you'll want to go ahead and get the entire thing re-routed out of your house (the AC drip line that is)
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