Garage ceiling insulation and vapor barrier. Warm side/ cold side

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Posted by: from Shelburne
1/21/2020 at 5:23:47 PM

Hi, the ceiling in the front half of my car and a half garage is dry walled but not insulated above. The rest of the ceiling and walls are insulated, vapor barrier and drywalled. This space is heated in the winter and I am losing heat and wasting money. Can I strap, insulate and vapor barrier and drywall over the existing drywall? Or will this create a condensation/ mould problem? I don't really want to remove the existing drywall. Any advice is appreciated.

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Date/Time1/22/2020 at 10:08:16 AM

I recommend crawling in the part of the ceiling that has no insulation and insulate it from above more than likely there is vapour barrier already underneath the drywall and if not to save money just insulate Area from above. It's always best to see a picture of what you're asking for to get a better opinion

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Date/Time1/22/2020 at 11:33:32 AM

What I would do is use foam board from home Depot 1 1/2 or 2 inch glue it with an adhesive directly to the dry wall then cover that. By doing it this way you will don't have any moisture issues as your leaving no room for air movement.



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Date/Time1/22/2020 at 12:00:30 PM


first make some holes on the existing drywall because insulation needs venting then after strap insulate and new drywall will work.

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Date/Time1/23/2020 at 12:31:44 AM

I have to assume it's not possible to climb into the ceiling space to add insulation. It would be possible to do as you suggest but the question is why? All you are saving is the demo of the drywall and then you have to add new framing? Poly should be on the warm side of the insulation to avoid trapping condensation. You also need to make sure you have adequate ventilation above the insulation.

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Alopa in Kansas
Date/Time1/25/2020 at 6:58:25 AM

The vibration damping material is a high-density viscoelastic membrane with a protective coating of aluminum foil. The presence of an aluminum coating provides effective mechanical protection and resistance to temperature. The presence of an adhesive layer greatly facilitates installation.

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