A little nervous...

[oba97]

I recently blew about 8" into my attic above my garage. I just moved into the house about a year and a half ago. Never paid much attention to the ceiling before now. It looks as though you can see the individual sheets if drywall and some nail dimples. The drywall is 5/8 on 24" centers. What has me nervous is that it's nailed. I'm wondering if I should be fine and probably not too much effort into finishing because its a garage or.... Too much much weight for the nails.

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[bczygan]

Got access to above?

 

[oba97]

It doesn't look like its waving between the joices, just you can see the outline if the individual sheets.


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[oba97]

Yes, just blew last weekend. Everything seemed tight then


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[Mustang51js]

Throw some screws in there and sparkle,the extra weight just pushed it down a little. Most of it was prob from walking on studs putting insulation in.

 

[brownbagg]

that looks like uplift due to temperature change of trusses

 

[oba97]

Brown bag, can you explain that. Not sure what that is.


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[Nowater]

Trusses change with temperature. Do you have wooden trusses? If you added 8" of insulation, you must live in a cold climate. Truss uplift is when the trusses bow upward in the winter time. Sometimes the trusses move so much that the ceiling wants to lift away from central interior walls and a big gap shows and the homeowner freaks out.

You may be able to fix your problem with drywall screws as suggested.

 

[oba97]

Yes, I live in Michigan. It's very cold right now.


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[Scott H in Wheaton]

I highly doubt if 8" of blown insulation would be enough to affect drywall. We commonly do 18-22" to get a suggested R49 - R60.

 

[oba97]

So the fact that nails were used shouldn't be an issue?


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[Scott H in Wheaton]

If it concerns you, snap a chalkline along the joists and add coarse thread 1 1/2" drywall screws every couple feet.
Shouldn't be necessary, but if it helps you sleep at night...

 

[63spyder]

Sheet rock nails were common before screws , nails are fine if they put the right amount for nailing ceilings

 

[oba97]

Thanks everybody for the replies. Sounds like I'm fine but can add screws like Scott said for piece of mind


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[JakeKohl]

If the sheetrock actually moved, it should be cracked like crazy. It won't take much. If the nailheads are protruding from the drywall (hard to tell in that picture) they're just moving VERY gradually from heat and cool cycles over a long period of time on their own...and if the nailhead is protruding from the sheetrock, the nail is moving, not the sheetrock.

My house has 1/2" sheetrock and 1/2" concrete board on the ceilings all held up with nails. It's been that way for 60 years. Nothing's falling on me yet. Where I have had the occasional crack (usually the middle of the spans in the bigger rooms), I put in screws down the entire length and on each side of the crack, fill and fair the crack and repaint. I repaired one of them this way 10 years ago and it's holding up fine.

 

[Majordisorder]

Its not uncommon for it to be high humidity in a garage. You pull a wet car in and it dries off. If the drywall finish is allowing moist air to penetrate it will reach the dew point somewhere between the surface and the insulation itself. What you are seeing could be the drywall swelling slightly from the moisture present. If this is the case, add some screws as suggested, spackle, then prime/paint with a quality, low perm finish.