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-   -   Poor venting caused brown stain? (http://www.diychatroom.com/f9/poor-venting-caused-brown-stain-129217/)

MikePet 01-08-2012 09:15 AM

Poor venting caused brown stain?
 
1 Attachment(s)
Hi all, I took a hot shower last night and half way through the shower I noticed a small brown stain on my bathroom ceiling. Initially I thought I had a roof leak but it's bone dry outside and no pipes above. Could this be condensation finally catching up? The bathroom is very small ( with a mediocre venting fan) and gets steamy easily.
I'm thinking it's something with the paint reacting to the constant moisture?

Attached is the pic of the stain: it looks bigger in the pic but really about 2-3" diameter.

Attachment 43724

Thanks all!

Stefanie

MikePet 01-08-2012 09:55 AM

1 Attachment(s)
Hi all, I took a hot shower last night and half way through the shower I noticed a small brown stain on my bathroom ceiling. Which im certain wasnt there when i got in Initially I thought I had a roof leak but it's bone dry outside and no pipes above. Could this be condensation finally catching up? The bathroom is very small ( with a mediocre venting fan) and gets steamy easily.
I'm thinking it's something with the paint reacting to the constant moisture?

Attached is the pic of the stain: it looks bigger in the pic but really about 2-3" diameter.

Attachment 43725

Please note the house was very humid because we had 60 degrees yesterday , and the few days before we're freezing.

bobelectric 01-08-2012 11:27 AM

Poor venting,Vent outside?

MikePet 01-08-2012 11:29 AM

Quote:

Originally Posted by bobelectric
Poor venting,Vent outside?

Hi bob, yes it vents outside. Just took a hot shower again and noticed that spot looked moist again.
My husband is away for a month so I'm trying to figure this myself.
Thank you!

iminaquagmire 01-08-2012 11:41 AM

When its cold outside and cold in the attic, chances are you'll have a cold exhaust duct for the fan too. If the fan isn't strong enough to exhaust the warm moist air outside before it condenses on the cold pipe, you can get what you have when the condensation comes back down the duct. The solution is to 1) make sure your fan has good pull, 2) you have insulated ducting for the fan exhaust, and 3) there are no dips or bellies in the exhaust pipe that can collect condensation.

MikePet 01-08-2012 11:55 AM

Thanks quag. What gets me is why only on this one spot? Is it because it's right next to the shower and bathroom fan? That's where most of the heat moisture goes ( that spot)

iminaquagmire 01-08-2012 12:06 PM

Could be the design of the fan. Most fans have the exhaust port on the side of the fan housing.

joecaption 01-08-2012 12:45 PM

If there's a bare spot in the insulation that spot would be colder and water would condenice there first.
Have you more the insulation back in that area to see if it wet on the top side of the drywall? If the insulations wet and the top side is wet then it's a leak from above.

oh'mike 01-08-2012 12:48 PM

Two likely causes---condensation in the vent fan tubing---leaking back and staining from on top--

Insulate the vent pipe after you replace the old leaky one--

Or--Missing insulation above the stained spot causing condensation right there---add insulation.

MikePet 01-08-2012 12:51 PM

Hasn't rained in ages. Roof is bone dry. Haven't gotten to insulation because I haven't ripped ceiling open. Hoping to avoid that

MikePet 01-08-2012 05:28 PM

I think it's weird that this issue occurred on a day we unusually got 60 degree weather after a week of really cold weather. Doesn't help my bathroom is very very small

MikePet 01-09-2012 07:19 AM

I noticed the ceiling paint used is probably a standard white, wall paint. If I get a damp cloth and move my finger on it , paint comes right off.

MikePet 01-09-2012 07:20 AM

I noticed the ceiling paint used is probably a standard white, wall paint. If I get a damp cloth and move my finger on it , paint comes off, fairly easily. And I'm not talking about the spot where there is a stain.

Windows on Wash 01-09-2012 07:30 AM

Need to see/know about the attic conditions.
  1. insulation
  2. venting
  3. bath fan venting
  4. etc.

oh'mike 01-09-2012 07:43 AM

Get us a few pictures from above--that's where the problem is---


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