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Old 09-24-2021, 09:42 AM   #1
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Completely OT: Garage ceiling insulation

I know this is a weird forum to ask this, but since so many of you are handy and most other forums have died off in favor of fb: any one have a good way to insulate a wood truss garage ceiling without doing drywall? I'm leaning towards just stapling in batt - I can get faced R-30, which is at least something. Code would say R-40 and above but it's just the garage.

I've been neglecting the van getting the garage ready for winter and this is the last piece of the puzzle. The ceiling is at 12' which makes it a huge pain to get drywall up that high. I was also wondering about laying something cross ways across the rafters? Might not be very well sealed, but I'm looking for good - not perfect. Heating will be via a combo 220V unit heater and propane salamander.

(Old) Pic of the van in its spot as a reference.
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Old 09-24-2021, 10:28 AM   #2
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The thing about drywall is that fire resistant quality.
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Old 09-24-2021, 12:24 PM   #3
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What about 2” polyiso or similar? It’s lightweight and also fire resistant.
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Old 09-24-2021, 12:24 PM   #4
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I would strongly suggest doing the R40 and the drywall and be done with it.

With one of these it really it isn't too bad of a job hanging 12' sheets with one of these, you can rent them pretty cheap.

https://www.google.com/aclk?sa=L&ai=...gQIARBz&adurl=
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Old 09-24-2021, 10:31 PM   #5
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Sprayed-in foam done by a pro?

My 30'x40' garage has a sloping roof and I began with pink stuff batts at the low side. Got most of one row done so I could build shelving along that wall and stopped for a rethink. I think foam would be the most effective way to do the remaining walls and ceiling, but I'd have to move tons of crap outside for that to happen. Have not gotten a quote yet but they'd need a scissors lift to reach a lot of it. Good luck!

Shortly after house purchase and before the move. Garage currently packed with stuff.
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Old 09-25-2021, 09:41 AM   #6
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30x40 garage! Not feeling too sorry for you here and your delima, lol
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Old 09-25-2021, 11:47 AM   #7
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There's always ever popular drop tile.
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Old 09-25-2021, 05:16 PM   #8
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Quote:
Originally Posted by Lilnuts2 View Post
30x40 garage! Not feeling too sorry for you here and your delima, lol
Oops, I was remembering the edge-to-edge roof measurements from the calculations for our rain catchment system. The actual interior measurement is 27'x37'. Sorry for fudging those numbers.

Still full of crap and it's hard to make all that stuff go away.
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Old 09-25-2021, 06:59 PM   #9
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Mine is just insulation stapled to the rafters so I can still store stuff on the joist. I had to pull some down as I had a roof leak. New roof going on in a couple weeks.
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Old 09-25-2021, 08:42 PM   #10
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You can also run some wire below the insulation to help support it.
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