Ceiling Joist Damage


  #1  
Old 05-18-10, 10:52 AM
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Ceiling Joist Damage

The ceiling joists above my living room have developed spotty stains and have dripped sticky goo onto the table and floor underneath them. As you can see in the pictures the spots are on the underside of the joists and there are no stains or lines on the sides. If this was rain damage, I would expect more significant leakage onto the floor, stains on the sides of the vaulted ceiling joists and less gooey deposits, but I cannot rule out rain as the cause as we have had significant downpours lately. There are no holes or visible sawdust but I'm wondering if this could also be caused by some kind of fungus or insect.

Does anyone have any suggestions as to what is causing this staining and dripping?


Here is a link to four pics on picasa. The first two show the stains on the joists, the second two show the drip on the table:
Picasa Web Albums - satsujinsha - Ceiling Joist

Thank you in advance for any advice!
 
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Old 05-19-10, 04:23 PM
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That appears to be a beam and not a "joist". It appears to have been stained at one point and then painted over. The stain is bleeding through the paint. NOW, what is causing it to drip could very well be from the roof. Do you have a centrally located ridge vent on top of the roof? If so, blown rain could find its way into that area, soak the beam and allow the stain to bleed.
 
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Old 05-20-10, 03:47 AM
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... also the stain on the ceiling panel in the 2nd pic is definitely a water stain. Remember a roof leak can travel a distance in the attic before it comes thru the ceiling.
 
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Old 05-24-10, 11:50 AM
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Thanks for the info. There is no ridge vent in the roof. Since the consensus is that the dripping must be water leaking in the roof, I will examine the shingles for any damage.

What product do you recommend to seal the stains in the beam before I paint it?

Thanks Again for your responses!
 
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Old 05-24-10, 01:44 PM
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Most oil base stain hiding primers will do a sufficient job. Pigmented shellac [like zinnser's BIN] is the ultimate stain sealer. I don't have any confidence in any of the water based primer sealers when it comes to water stains.
 
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Old 05-26-10, 08:28 AM
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Go in the attic next time it rains and see if you have leak. May be hard to find, but you'll need to fix that first if it exists.
Then you can work on sealing the beam.
If no leak to be found, could the beam be sapping out and cause this?
 
 

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