ceiling sagging

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swimmer_spe

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See those dimples? They are where screws are. Last year we had an ice dam. This year, this happened. The ice dam has been mitigated with insulation last year.

Can I just screw that back up or is the drywall now too far gone and should be replaced?
 
I'd just push it back up and add more screws making sure not to pop them through the paper.
Was the old wet moldy insulation removed before new was added?
 
joecaption said:
I'd just push it back up and add more screws making sure not to pop them through the paper.
Was the old wet moldy insulation removed before new was added?
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Yes the moldy or wet insulation was removed.
 
I've always found that when drywall gets wet and bows, is allowed to dry, it's simpler to remove and replace.
 
Snoonyb said:
I've always found that when drywall gets wet and bows, is allowed to dry, it's simpler to remove and replace.
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But do I need to replace it, or would a couple of screws hold it up?
 
I have never had any luck pulling drooped drywall back up with just screws. I made a tool I have used with great success out of a 4’ long piece of wood something like a 1x4. I drilled 4 holes down the length that were just slightly larger than a screw shank. Then I added another 6-8 holes that were larger than a drywall screw head. I line it up along the joist using 2-3 of these I run the screws in that pull the wood thing up and pulling the ceiling up as the force is spread out over the large 4”x4’ area. I run them up a little at a time on 2-3 joists and when I get it all pulled up flat I then put screws up in the larger holes once I get them all in they will hold it when I take the tools down. I then put screws in those holes as well.


I have used it on drywall and it really works good on old plaster that has started to sag away from the lath. In those cases I make the large holes large enough to clear a plaster washer.


With drywall it is a judgment call as it is sometimes easier as @Snoonyb said to just replace tape and do a bad section. If there is loose insulation above that’s a good reason to try and fix it as is.
 
You can push it back up, but no amount of screws will make it smooth and finished.
 
Snoonyb said:
You can push it back up, but no amount of screws will make it smooth and finished.
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Iss there even a point to doing anything to it? I am more concerned about it collapsing one day.
 
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