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Old 09-11-2016, 01:53 PM   #1
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Drywall Overlayment Issue


I have a question with a master bedroom ceiling. 1st layer of drywall was installed with 3/8" drywall & nailed. The second layer of 3/8" drywall was just glued with a roller somehow with no nails or screws. Well after 20 years the second layer of drywall let go and came crashing down. What's the right way of fixing this mess & how should I make sure it dosen't start throughout the rest of the house.

I'm worry if I start screwing the drywall ceiling in the rest of the house, i could fracture the glue bond and the reast of the ceilings could come down.

I have a picture in my album, of what the 1st layer of drywall looks like.
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Old 09-11-2016, 02:24 PM   #2
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Re: Drywall Overlayment Issue


Interesting.... I've really never heard of that.... where do you live and how old is the home.... just curiosity.

I'd grab a screw gun/ stud sensor/neck brace and get to work.
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Old 09-11-2016, 03:44 PM   #3
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Re: Drywall Overlayment Issue


Michigan house is 40 years old.
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Old 09-11-2016, 04:41 PM   #4
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Re: Drywall Overlayment Issue


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Originally Posted by seejr View Post
Michigan house is 40 years old.
Assuming the existing layer is sound, I would suggest simply adding a new layer of 1/2" drywall screwed into the joists. Rather than 1 1/4" screws i would recommend at least 1 5/8" screws. 2 inch might be better.

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Old 09-11-2016, 05:17 PM   #5
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Re: Drywall Overlayment Issue


One 4x8 sheet can be held with about 4 screws in the general field. No edge screws needed. If you can id the size of the sheets and find the joists, safe bet would be 6 screws in the middle field. No edges which could just separate while screwing.
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Old 09-11-2016, 05:36 PM   #6
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Re: Drywall Overlayment Issue


No way should 3/8" ever been used for a ceiling!
No way is just 4 screws in the field going to hold for long.
https://www.usg.com/content/dam/USG_...de-en-J371.pdf
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Old 09-11-2016, 09:22 PM   #7
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Re: Drywall Overlayment Issue


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Originally Posted by jeffmattero76 View Post
Assuming the existing layer is sound, I would suggest simply adding a new layer of 1/2" drywall screwed into the joists. Rather than 1 1/4" screws i would recommend at least 1 5/8" screws. 2 inch might be better.

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Jeff... That'sthe problem... the existing layer is not sound.
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Old 09-11-2016, 09:31 PM   #8
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Re: Drywall Overlayment Issue


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Originally Posted by joecaption View Post
No way should 3/8" ever been used for a ceiling!
No way is just 4 screws in the field going to hold for long.
https://www.usg.com/content/dam/USG_...de-en-J371.pdf
Joe.... No one believes 3/8 should be on the ceiling, let alone two layers.. ... let alone how 3/8 could have been glued /adhesiveed up there.

I think CXarpdad had a good idea to infield screw (streanthen) it up. It isn't perfect, but carpdad has mitigated potential failure of the existing and mitigated finishing issues.

Yes... perfect world and plenty of money... tear it off and do it right.
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Old 09-12-2016, 07:32 AM   #9
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Re: Drywall Overlayment Issue


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Jeff... That'sthe problem... the existing layer is not sound.
I may have missed it but i dont see where the OP mentioned anything about the existing layer not being sound. He said that layer was installed with nails, but the second layer was only installed with glue. The second layer was the one that was not sound and fell.

Assuming there is not blown in insulation above, he could remove the existing and reinstall 1/2" without much trouble. However, i view that as unnecessary since you could just cover the existing with the new 1/2". Both ways will require the same amount of work to hang and finish.

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Old 09-12-2016, 02:46 PM   #10
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Re: Drywall Overlayment Issue


Jeff: I don'r care for your fix to begin with but you math is worse.Two layers of 3/8 which equals 3/4" plus your suggestion to add another layer of 1/2" board? which equals 1 1/4" screws then adding 1 5/8 would be even better.The 1 1/4" srews will only penetrate the drywall and the 1 5/8 will only penetrate the joists 3/8"?
Not a good solution for 3 layers of drywall sandwiched together which should never happen anyhow.
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Old 09-12-2016, 03:18 PM   #11
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Re: Drywall Overlayment Issue


Mako - perhaps we are reading and replying to different posts. As i read the OP he says that originally there was one layer of 3/8ths nailed to the joists and a second layer of 3/8ths that was glued to the first. He went on to say that the second layer fell off. To me, that means that there is a nailed on layer with failed glue on it still attached to the ceiling. Therefore, adding a layer of 1/2" on top of the existing 3/8" would, by my math, mean that the total drywall would be 7/8" thick. Therefore a 1 5/8 " screw would be adequate but i would probably use 2". I never said he should use 1 1/4" screws.

Before criticizing my math skills, you may want to do something about your reading and comprehension skills!!#
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Jeff: I don'r care for your fix to begin with but you math is worse.Two layers of 3/8 which equals 3/4" plus your suggestion to add another layer of 1/2" board? which equals 1 1/4" screws then adding 1 5/8 would be even better.The 1 1/4" srews will only penetrate the drywall and the 1 5/8 will only penetrate the joists 3/8"?
Not a good solution for 3 layers of drywall sandwiched together which should never happen anyhow.

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Old 09-12-2016, 03:21 PM   #12
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Re: Drywall Overlayment Issue


Mako - one layer of 3/8" fell, so we're talking 1" of drywall on the ceiling total, in case that makes a difference in your opinion of the suggestion Jeff made.

EDIT - Looks like Jeff types faster than I do....
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