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Old 06-28-2012, 12:09 PM   #1
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Covering a ceiling with 1/4" drywall


I have a home built in 1974. The attic was sorely under insulated so was sprayed with loose fill cellulose up to 10-14". This caused a sag in the master bedroom ceiling. Which is drywall. The sag was removed by putting 2.5" screws into the joists every 10-12" or so. The sag is gone but wrinkles from the sag remain.

I furred the ceiling with 1x3" to the joists using 3" wood screws into the joists. Every 20-24". I would now like to recover the ceiling but want to avoid putting as much weight on the joists as possible. They are 2x4 joists (no constant on-center width, found out after I bought the house) they range from 16 out to 20.5" on center. I have attic access prior to the insulation blow in there is no water damage, mold issues, etc.

Can I use 1/4" drywall over screwed to the furring with 2" drywall screws and not have the 1/4" sag? Or do I have to use 1/2" - 5/8".

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Old 06-28-2012, 12:13 PM   #2
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Covering a ceiling with 1/4" drywall


From what I can recall, you can't use 1/4" there - it's going to sag. 1/2" is good for ceilings on 16" spacing without sag. I think with your 20-24" spacing, you will need to use 5/8" or 1/2" ceiling board.

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Old 06-28-2012, 12:20 PM   #3
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Covering a ceiling with 1/4" drywall


In most if not all places 1/4" costs more than 1/2" ceiling board, go with the 1/2" CB or 5/8. Will give you strength and cost less.
You can get metal extensions for your ceiling boxes if needed.

Is there a reason you were thinking 1/4"?
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Old 06-28-2012, 12:25 PM   #4
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Covering a ceiling with 1/4" drywall


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Originally Posted by mae-ling View Post
In most if not all places 1/4" costs more than 1/2" ceiling board, go with the 1/2" CB or 5/8. Will give you strength and cost less.
You can get metal extensions for your ceiling boxes if needed.

Is there a reason you were thinking 1/4"?
No other reason except weight cutting.

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Old 06-28-2012, 12:28 PM   #5
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Covering a ceiling with 1/4" drywall


Remember you will need screws long enough to go through your existing ceiling as well.
I always get 1.5" + whatever thickness of ceiling you have now.
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Old 06-28-2012, 12:36 PM   #6
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Covering a ceiling with 1/4" drywall


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Originally Posted by mae-ling View Post
Remember you will need screws long enough to go through your existing ceiling as well.
I always get 1.5" + whatever thickness of ceiling you have now.
If I'm going into the 1x3 furring why do I need to penetrate the existing ceiling as well? (Not arguing just asking)

If I were to penetrate the dry wall I'm hanging, the furring, and the current drywall ceiling I'd need nearly 3" screws.
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Old 06-28-2012, 12:44 PM   #7
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Covering a ceiling with 1/4" drywall


Sorry my bad. overlooked that part.
Yeah 1.5" would be fine.
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Old 06-28-2012, 11:56 PM   #8
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Covering a ceiling with 1/4" drywall


I'd use lightweight drywall, 1/2"- spans same as 5/8 because of fiberglass strands but is 30% lighter than regular. http://www.theweighthasbeenlifted.com/

Use lightweight compound (also 30% lighter), same adhesion as all-purpose regular mud;http://www.usg.com/rc/installation-a...s-en-J1795.pdf

A few tips for your install: http://www.finehomebuilding.com/PDF/Free/021174058.pdf

The answers to a multitude of future questions (screw length included): http://www.lafargenorthamerica.com/G...%20English.pdf

Gary
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Old 06-29-2012, 12:27 AM   #9
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Covering a ceiling with 1/4" drywall


You have a home that was built in 1974 that has 2x4 ceiling joist??? How far do these joist span? Sounds like that is your whole problem to me.. Is it a truss roof?
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Old 06-29-2012, 08:23 AM   #10
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Covering a ceiling with 1/4" drywall


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Originally Posted by CopperClad View Post
You have a home that was built in 1974 that has 2x4 ceiling joist??? How far do these joist span? Sounds like that is your whole problem to me.. Is it a truss roof?
Yes it it a truss roof, rest of the house seems to be built to withstand a bomb blast (has survived an earth quake or 3). The roof not so much un even on center spacing, 2 x 4 construction.

Last edited by chaostactics; 06-29-2012 at 08:25 AM.
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Old 06-29-2012, 11:10 AM   #11
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Covering a ceiling with 1/4" drywall


This seems like the best choice for the job
Sheetrock Ultralight
http://www.homedepot.com/Building-Ma...kuId=202938937

Says stiff, for upto 24" on center, and its light weight. It got bad reviews for wall use, but otherwise positive reviews.
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Old 06-29-2012, 08:27 PM   #12
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Covering a ceiling with 1/4" drywall


Had you run the 1x3 perpendicular to the joists, and spaced them at 12", or 16" OC, you could have use 1/4" rock.

If you did run them perpendicular, just add some additional ones to fill in.


Personally, I would still use at least 3/8" rock, as the 1/4" rock doesn't usually have a good tapered edge to work with.

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