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bay window leaking @ drywall after rain (picture attached!)

bay window leaking @ drywall after rain (picture attached!)

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  #1  
Old 07-23-08, 11:08 PM
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bay window leaking @ drywall after rain (picture attached!)

with tonight's heavy rain I heard some dripping and traced it to the top of the bay window (inside the house). the leak is actually coming from the drywall bump-out that protrudes approx 1 1/2" back and frames the bay window. The area around the leak is somewhat spongy to the touch.

I notice some cracking on the drywall above the leak site, this part of the house has two skylights, which are approx 8 feet further back on the roof slant (see picture) any ideas what might be going on as well as potential fix? thanks!!

 
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Old 07-24-08, 08:17 PM
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Chances are the skylight has no bearing on the baywindow leaking. Water will follow the path of least resistance. If it were the skylight, there would most likely be water stains running from the skylight down the ceiling to the bay window. If the attic is open, that's the first place to start. If not, the bay window has some type of cap that is flashed to the house. Depending on how close it is to your roof line, the amount of water in the area, are all factors to take into account.
 
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Old 07-24-08, 08:20 PM
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Is there a rain gutter above the bay window? Have you looked at the roof directly above it? Look for missing shingles or nails that have risen above the roof.

I don't think it's the sky lights.
 
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Old 07-25-08, 01:46 PM
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Originally Posted by Kremeriky View Post
If the attic is open, that's the first place to start. If not, the bay window has some type of cap that is flashed to the house. Depending on how close it is to your roof line, the amount of water in the area, are all factors to take into account.
Thanks for the tips! Our only attic access is at the upstairs part of the house (split level). Our house is very similar in design to the one pictured below. The window in question -- which is more accurately described as a picture window as it is flush to the wall and not angled out -- is located in the same place where you see the bigger window on the non-garage, left side of the house. The roof overhang is very similar in our home and there is a rain gutter there. I checked the roof and gutter briefly at 1am in the rain that same night. Gutter draining fine, too dark to tell much with the roof.

 
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Old 07-25-08, 01:49 PM
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Originally Posted by Pulpo View Post
Is there a rain gutter above the bay window? Have you looked at the roof directly above it? Look for missing shingles or nails that have risen above the roof.

I don't think it's the sky lights.
thanks! Yes, rain gutter is there and checked during the storm. I need to get up there in the daylight and inspect the roof closely as you have described.
 
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Old 07-25-08, 02:11 PM
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Don't completely dismiss the skylights. Unlikely, but some skylights are poorly designed and even more poorly installed.

Need to get up inside that attic and look for trails or water, but you already know that.
 
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Old 07-25-08, 04:49 PM
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With the amount of roof overhang and the closeness of the window to the soffit I kind of doubt it is the window unless the rain was coming down sideways, also the leak was above the window. Water can wick up but I doubt it. I would get on the roof and visually inspect the skylights for cracks in the caulking and bad flashing. Water can travel a long way in the roof without being exposed from underneath. You could re-create the leak with a hose starting at the window and working your way up to see where/ when it starts leaking. Take you time, sometimes it takes a while for the water / leak to flow. It it was very windy the water could have blown up under the flashing on the skylights. A couple tubes of blackjack and a putty knife will fix that.
 
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