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Posted by tbasc@bellsouth.net on November 19, 2006, 8:07 am
Mike S. wrote:
> I recently noticed something unusual about the ceiling in one of rooms
> in my house (actually, my parents house) and it has me a little
> concerned. I'm not sure how to describe it though. There are two vents
> in the ceiling, one is to the south end of the room and the other at
> the east end. If I lay on the floor and look up at the ceiling, I can
> see what looks like marks or imprints of some sort of where the metal
> ducts in the attic go from the entrance of the room (west side) over to
> the east vent. Basically, these marks go almost all the way across the
> room.
>
> There are other weird marks that go from south to north but I have no
> idea what they are. There are about 3-5 of them and they're a sort of
> light brownish color that are about 4-6 inches wide. My first
> impression upon seeing them is that something in the attic got too hot
> and it burnt the ceiling. The other thing I thought it could be was
> some sort of water damage but I'm not sure that's it.
>
> When I go up to the attic to look, I don't see anything unusual but I'm
> not an expert and I'm not sure what to look for. There's nothing in the
> attic except for the attic fan, cable tv wires, antenna wires, metal
> air ducts, electrical wiring, and insulation. It's not used for storage
> as it wasn't designed for that.
>
> The only thing I know is that once, two months ago, there was a small
> amount of water dripping from the corner of the east vent in that room.
> My father checked it out and it hasn't leaked since then but I don't
> know what the problem wasometimes, when it rains, it does sound like
> there's water dripping in the attic but I can't confirm that.
>
> Any ideas on what could be going on with the marks from the air duct
> and the brown marks?
I think ransley is correct or nearly correct.
The water coming from the duct vent suggests poorly sealed joints in
the duct work.
The series of marks probably match joints in the duct or in the
insulation.
I think the joints have to be sealed and then the insulation made
continuous.
A barrier should be on the outside.
TB
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