I have a 30x40 wood framed detached garage. I have insulated the walls and installed OSB. The ceiling was drywalled and insulated when I bought the place, but the previous owner installed the ceiling poorly and never taped or mudded the seams which are very uneven. It looks awful and I do not wish to tear it all out and redo it. I was wanting to install a metal ceiling over the drywall. My only concern is condensation. I would assume that having the insulation and drywall above the steel will negate this as an issue, but I want to be sure before moving forward. Currently no moisture issues.
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Installing Metal Ceiling over Drywall
- Thread starter Xenadad
- Start date
BombShelter
Well-known member
What climate are you in?
If you put something like corrugated metal roofing in and left the ends open so they can breath I don't think you'd have much of a problem. I've got it in my garage and the only moisture I see is on the tools when it's 40+ outside with some snow melting, I've never seen it on the ceiling. I usually have the dehumidifiers on full blast during that time.
If you put something like corrugated metal roofing in and left the ends open so they can breath I don't think you'd have much of a problem. I've got it in my garage and the only moisture I see is on the tools when it's 40+ outside with some snow melting, I've never seen it on the ceiling. I usually have the dehumidifiers on full blast during that time.
Youngandfree
Well-known member
Is your garage climate controlled? I'd find rafters and mark their layout and place furring strips to screw the metal too.
djbmw
Well-known member
If your roof ever leaks... it will start to mold the drywall and, since it'll be hidden under the metal panels, you'll have no idea why you're getting sick.
Do it right, or not at all - is the motto to live by
Do it right, or not at all - is the motto to live by
How would this be any different than a metal ceiling with a plastic barrier above and blown cellulose insulation with a roof leak ? The plastic would hold the leaked water, cellulose would be soaked, get nasty and along with the framing start to mold.If your roof ever leaks... it will start to mold the drywall and, since it'll be hidden under the metal panels, you'll have no idea why you're getting sick.
Do it right, or not at all - is the motto to live by
If the drywall is untaped/mudded and you can see the screws, I would take it down for weight off the trusses.
However, what is the insulation ? Fiberglass batts or blown in insulation ? If it's the latter, you may create another problem with what is going to hold up the insulation while you replace the ceiling ?
djbmw
Well-known member
We dont know what type of insulation he has but, to answer your question, mold loves to feast on the cellulose in drywall... but has nothing organic to eat if there's fiberglass insulation (most homes and shops here in the north use fiberglass as it used to be cheap). If he has cellulose insulation then there wouldnt be any difference.How would this be any different than a metal ceiling with a plastic barrier above and blown cellulose insulation with a roof leak ? The plastic would hold the leaked water, cellulose would be soaked, get nasty and along with the framing start to mold.
If the drywall is untaped/mudded and you can see the screws, I would take it down for weight off the trusses.
However, what is the insulation ? Fiberglass batts or blown in insulation ? If it's the latter, you may create another problem with what is going to hold up the insulation while you replace the ceiling ?
R30 rolled insulation in the ceiling above the drywall. There is no tape or mud on the seams, so I know where the rafters are. The drywall was put up horribly...lots of uneven seams...would be a nightmare to try and level out. The garage has heat that is rarely used...no AC. Located in the middle of NC.
It would be best to put on furring strips, furring strips would be easier to hit and allow a little air movement between layers. But I could see me just laying right over drywall in a pinch. If you rarely use heat there is limited chance of condensation.