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2 posts · Joined 2017. #1 · Aug 25, 2017. I'm looking to insulate my garage ceiling and everything I've read and researched has stated baffles/rafter/ceiling vents are absolutely required. I was prepared to purchase them; however when I accessed my finished garage attic I found that there is a board that separates my soffit from the trusts ...
The ceiling joist are 2x4 - 24"oc. When in the attic the ceiling is a bit bouncy. I have a few minor things in the attic such as spare moldings for my kitchen cabinets and florescent light tube. The space above the garage door is wasted space. I have seen some recommendations to put up a rail type system and slide storage boxes up there like here.
Looking for ideas on how to insulate my garage ceiling. Its an unfinished garage with an unfinished bonus room above garage. I am wanting to put in dual zone mini split but need to insulate and drywall first. The ceiling is made of 16in tall I beams that are spaced 12in apart. Not ideal for any fiberglass sizes I can find.
Also paper tape and coat over the seams and nail heads of drywall above ceiling (painted) line to isolate any fire in the garage from entering the house attic as per code (required). Run 2x6’s across the short (11’) span below the existing at 16” or 32” on center, depending on the ceiling material.
No vapor barrier. Install a vapor retarder. Certainteed Membrane is the least expensive. Install this first, then the finished ceiling. Cut attic access into an outside gable (make an door), and blow in cellulose after the ceiling is finished. You'll need baffles near the eaves, soffit vents and a ridge vent.
3769 posts · Joined 2022. #6 · Sep 7, 2024 (Edited) Since it is open to the roof perhaps sprayed foam is your best choice for insulation if you find an excellent installer. It will be expensive upfront but the comfort and quick payback will make you happy 😊 . If you spray foam, maybe make this cathedral ceiling.
Insulated ceiling and walls will make a huge difference in comfort, even without a source of heating or cooling. Makes the interior temp a lot more stable and resistant to wild temperature swings. Of course with insulation it's then possible to warm the garage up with even a moderate source of heat, or throw in a window unit and cool it off.
If you plan to insulate, you should use a 6 mil poly vapour barrier on the walls and ceiling. Paper faced insulation is not a good vapour barrier. Reply Like. S. Scuba_Dave. 17249 posts · Joined 2009. #5 · Oct 23, 2010. If you aren't heating it don't bother with plastic. Just use paper faced insulation.
I've removed the existing type-x drywall on the garage ceiling to install some sound / fire insulation in between the truss bottom chords. I'm now ready to re-install a fire barrier. I had an idea to use 1/2" ceramic fiber insulation in place of 5/8" type-x drywall, mainly due to having to deal with hoisting 5/8 gypsum by myself.
Pre fabbed trusses were used. I would like to renovate the garage interior and add R-19 batt insulation into the walls. I would then like to add at least 1 in of polyiso foam board to increase my R value. I might over lap the 1 inch board to give me 2 inches to even get a better R value. I am aware about furring out existing doors, outlets, etc...