Strange marks on ceiling
 

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 was. Sometimes, 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?

Strange marks on ceiling
 

Probably not enough insulation on the ducts and you get condensation in
summer when its real hot and the AC is on.

Strange marks on ceiling
 

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

Strange marks on ceiling
 

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 was. Sometimes, 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 agree with the others. Sounds like moisture. A/C is one likely
source. You may need to go up there and take a look to verify the problem
and to correct it.

--
Joseph Meehan

Dia 's Muire duit

Strange marks on ceiling
 

Mike S. wrote:
....
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.
....
Any ideas on what could be going on with the marks from the air duct
and the brown marks?

I agree mostl likely the water stains are the color -- the pattern(s)
might be the drywall joints. Quite often w/ a small amount of water,
the paper surface sheds the water and but the joint compound/cracks
between the sheets absorbs it and "telegraphs" through to the other
surface...

Strange marks on ceiling
 

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 was. Sometimes, 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'm with the others who think this is due to water condensing in
or on the duct. Where I differ slightly is that I would suggest
the condensation might be the result of poor drainage from the drip
pan beneath the A/C coil. That can lead to excessive humidity and
even free water in the ducts. Check that the drain(s) is/are clear.

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form .

Strange marks on ceiling
 

On 19 Nov 2006 01:04:04 -0800, "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 was. Sometimes, 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?


Got photos?

later,

tom @ www.Consolidated-Loans.info