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Question DetailsAsked on 6/24/2015

There is a sticky stain on the cathedral ceiling area of manufactured home. There is NO roof leak.

The stain appeared during hot, humid weather on the exposed surface of new drywall that had been put up as a patch where there had been (I thought) damage from a prior leak. The back (hidden) side of the drywall is dry/clean & the vapor barrier & insulation is dry. There is no evidence of insects or rodents in the ceiling area. The house is approx 10 yrs old and the roof was replaced with standing seam metal roofing. The attic area is unvented. The stain starts from the peak adjacent to the ridge beam spanning the living room (across the parting wall of the 2 sections of the home). I also do not see any sap coming out of the wood beam. My research indicates it is appropriate for this area to be unvented. I am perplexed as to the source of this substance causing the stain & would welcome direction/suggestions.

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2 Answers

0
Votes

Lot of possibilities listed below from similar question - house settlement pulling hard enough to separate the tape, moisture (from above or due to high ceiling getting cold enough to condense moisture, which is then affecting the joint), moisture or frost forming in the attic (or from a leak) putting weight on the ceiling (flat parts) or running along the drywall and then hitting the joints and affect it, lousy taping job or poor quality tape, inadequate fasteners so drywall is pulling loose (might or might ot eventually fall if that is the case)- just a bundle of possibilities. Following are some links to similar questions with answers, though each case is different - I would say a good old-time drywall contractor or General Contractor might be able to give you a better idea after they have looked at it.


https://answers.angieslist.com/What-c...


https://answers.angieslist.com/large-...


https://answers.angieslist.com/Large-...


https://answers.angieslist.com/I-larg...


In your particular case, I would be looking (especially if sticky) at condensation on the beaam (particularly if it penetrates the ceiling into the rafter space under the roof) running down the beam and depositing wood sap/resin on your ceiling.


Other possibilities - you got hold of some of that Chinese sulferous drywall that came into the Southeast (mostly Florida, MIssissippi, Louisiana) after hurricanes in 2001 and again in 2004-2008 (mostly, though a bit has shown up in the Pacific Northwest too) - it can change color to yellow or orange and look stained when it picks up moisture fromthe air in humid conditions. You could try a stain-blocking primer like Kilz and then repaint it and see what happens. If the sulferous drywall will likely start getting rust or popouts at the nails/screws in short order.

Answered 4 years ago by LCD

0
Votes

I was looking at this question/answer as a possible reference to answer another question - if you have not solved the problem by now, between the hot weather first occurrence, stickiness (so not just condensation staining unless the paint is real low quality and is going gooey with condensation), I would say pretty much has to be either caulk going sticky and releasing materials causing the stain (pretty uncommon after it has cured), or some sap coming out of the ridge beam (assuming this is wood). Or insect (bee) or rodent nest above there releasing material that is soaking through and causing staining.


Since you said there was no nest in attic, and you have vapor barrier to boot, sounds to me like staining from the beam passing into the drywall directly (rather than from above) and staining it. Only way to tell for sure would be removing piece of drywall again and looking / feeling at the edge and at the beam for stickiness.


Or like one case I worked on with several such spots like this popping up erratically - they had replaced sheet of drywall, sealed the beam, investigated in the attic - turned out household teenages was shooting playdough "bullets" which he had fabricated, out of a foam "bullet" gun - shooting down flies or mosquitos or spiders or whatever on/near the ceiling, leaving a sticky but colorless oily stain at some locations where it made hard enough impact to transfer some of the oil from the playdough. The telling point was, like yours the top surface of the drywall was clean, and the stains washed completely off with Dawn and did not come back the same place.

Answered 3 years ago by LCD




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