Bowed Ceiling Drywall


C

creative1986

A friend recently bought a house and the unfinished (not taped and mudded) drywall is bowed down between the trusses across the whole ceiling. I looked in the attic and there is standard %30 batt insulation between the trusses and I don't know why the drywall is bowing down. What is the easiest/least expensive way to fix this? He doesn't want to tear all the existing drywall out if it can be helped. Thanks.
 
C

creative1986

A friend recently bought a house and the unfinished (not taped and mudded) drywall is bowed down between the trusses across the whole ceiling. I looked in the attic and there is standard %30 batt insulation between the trusses and I don't know why the drywall is bowing down. What is the easiest/least expensive way to fix this? He doesn't want to tear all the existing drywall out if it can be helped. Thanks.
Just wanted to add that it's the ceiling in the garage only that is bowed down and that should say R30 insulation. The drywall looks like its sagging down about 1/2"-3/4" between the trusses that are on 24" centers.
 
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J

jloomis

I would consider replacing it......
Once drywall is left in a position, and is warped, the warping is
"memorized" into it.
Similar to bending sheetrock prior to installing on a rounded corner.
We wet it, and let it sag by placing it on a wall with a steep angle of
resting.
I was wondering if the rock was ran correctly, and like plywood, it has a
grain and a direction of run.
Also was ceiling board used?
Ceiling board is more rigid.
Also I consider a garage an un-climatized area and suspect to moisture....
Over the period of time, it may have taken on moisture and sagged.
Are the nails/screws holding it up well?
Usually a 2' on center ceiling is fine for sheetrock, if the rock is
properly fastened, ceiling board quality or 5/8",
and ran with the grain and or strength in mind.
john

wrote in message

A friend recently bought a house and the unfinished (not taped and mudded)
drywall is bowed down between the trusses across the whole ceiling. I looked
in the attic and there is standard %30 batt insulation between the trusses
and I don't know why the drywall is bowing down. What is the easiest/least
expensive way to fix this? He doesn't want to tear all the existing drywall
out if it can be helped. Thanks.
 
C

creative1986

I would consider replacing it......

Once drywall is left in a position, and is warped, the warping is

"memorized" into it.

Similar to bending sheetrock prior to installing on a rounded corner.

We wet it, and let it sag by placing it on a wall with a steep angle of

resting.
I was wondering if the rock was ran correctly, and like plywood, it has a

grain and a direction of run.

Also was ceiling board used?

Ceiling board is more rigid.

Also I consider a garage an un-climatized area and suspect to moisture.....

Over the period of time, it may have taken on moisture and sagged.

Are the nails/screws holding it up well?

Usually a 2' on center ceiling is fine for sheetrock, if the rock is

properly fastened, ceiling board quality or 5/8",

and ran with the grain and or strength in mind.

john



wrote in message




A friend recently bought a house and the unfinished (not taped and mudded)

drywall is bowed down between the trusses across the whole ceiling. I looked

in the attic and there is standard %30 batt insulation between the trusses

and I don't know why the drywall is bowing down. What is the easiest/least

expensive way to fix this? He doesn't want to tear all the existing drywall

out if it can be helped. Thanks.

Thanks for the reply John.
The 4'x8' sheets of drywall are in a heated garage and the house is 7 yearsold so I assume the drywall is original. It is installed perpendicular to the trusses and is screwed along all edges and in the field. I kinda figured it would all have to come down but I hoped maybe a drywall guru had a magic trick up his sleeve.
 
J

jloomis

The only other thought occurs is improper roof ventilation.
Many people sheetrock the ceilings, and forget, especially in a heated room,
to allow moisture out.
Roofs need ventilation.
Insulation can tend to block the air flow, and one gets heated moist air
trapped in bays.
It will moisten sheetrock also, dampen plywood, and damage shingles (shorten
shingle life)
Check this out also, and see if the roof bays are vented and there is a way
out for moist air.
john
johnloomisconstruction.com

wrote in message

I would consider replacing it......

Once drywall is left in a position, and is warped, the warping is

"memorized" into it.

Similar to bending sheetrock prior to installing on a rounded corner.

We wet it, and let it sag by placing it on a wall with a steep angle of

resting.
I was wondering if the rock was ran correctly, and like plywood, it has a

grain and a direction of run.

Also was ceiling board used?

Ceiling board is more rigid.

Also I consider a garage an un-climatized area and suspect to moisture....

Over the period of time, it may have taken on moisture and sagged.

Are the nails/screws holding it up well?

Usually a 2' on center ceiling is fine for sheetrock, if the rock is

properly fastened, ceiling board quality or 5/8",

and ran with the grain and or strength in mind.

john



wrote in message




A friend recently bought a house and the unfinished (not taped and mudded)

drywall is bowed down between the trusses across the whole ceiling. I
looked

in the attic and there is standard %30 batt insulation between the trusses

and I don't know why the drywall is bowing down. What is the easiest/least

expensive way to fix this? He doesn't want to tear all the existing
drywall

out if it can be helped. Thanks.

Thanks for the reply John.
The 4'x8' sheets of drywall are in a heated garage and the house is 7 years
old so I assume the drywall is original. It is installed perpendicular to
the trusses and is screwed along all edges and in the field. I kinda figured
it would all have to come down but I hoped maybe a drywall guru had a magic
trick up his sleeve.
 
B

bilb2765

A friend recently bought a house and the unfinished (not taped and mudded) drywall is bowed down between the trusses across the whole ceiling. I looked in the attic and there is standard %30 batt insulation between the trusses and I don't know why the drywall is bowing down. What is the easiest/least expensive way to fix this? He doesn't want to tear all the existing drywall out if it can be helped. Thanks.
Can you open up an opening in the drywall? Remove a light cover??

I thought if a garage is within a living space, it is to be double
layered and muded on both layers. And at least 5/8" thick..

Maybe not the code there, but the exhaust is deadly, and should be
sealed correctly.
 
C

creative1986

The only other thought occurs is improper roof ventilation.
The 24'x36' gable roof has 30' of ridge vent and continuous ventilated aluminum soffit in the 12" overhang so ventilation should not be a problem, butI do believe moist air somehow caused that drywall to sag. The previous owner used the space as a workshop and there is no air conditioning so it stands to reason that the high humidity in the summer would cause the heavy drywall to sag. Also, the drywall is not painted, just taped and mudded, so the humidity was from both sides. Thanks for your input, looks to me like the stuff is gonna have to come down.
 
N

Nehmo Sergheyev

It will moisten sheetrock also, dampen plywood, and damage shingles (shorten

shingle life)
Moisture will damage (shorten the life of) shingles?
 
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J

jloomis

You have to include the rest of the discussion.
I am not sure what we spoke about, and the thread was back in May.
john

"Nehmo Sergheyev" wrote in message

It will moisten sheetrock also, dampen plywood, and damage shingles
(shorten

shingle life)
Moisture will damage (shorten the life of) shingles?
 

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