Bedroom Floor Over Garage... - Insulation - DIY Chatroom Home Improvement Forum

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Old 08-21-2013, 02:58 PM   #1
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Bedroom floor over garage...


I am redoing my daughter’s bedroom floor (it was carpet, I will put 12 mm laminate)
I have already removed the carpet, pad, stpales, etc…The sub-floor is OSB
We noticed during the last winter that the bedroom was colder that the other one: it makes sense since it’s over the garage
But the garage has drywall on the ceiling. So I cannot really see what is installed in terms of insulation…I assume there is already some fiber glass since there is a small opening in the ceiling, and I can see some fiber glass. But it’s kind of “messy”
What are my options to fix this:
  • Remove the subfloor, put new insulation and put new subfloor?
  • Remove drywall from garage’s ceiling, and add fiber glass?
  • Add an additional layer of insulation on the drywall (foam or other?)

The 2 first options are probably the best, but it’s a lot of work and $$$.......


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Old 08-22-2013, 09:42 PM   #2
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Remove drywall from garage ceiling. I personally would do spray foam for vb and some r value and then some fiberglass. Clean up the existing fiberglass because any gaps in between just let cold air in. Make sure you have a vapor barrier first, then your fiberglass. R-19 should be fine


Last edited by romex1220; 08-22-2013 at 09:46 PM.
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Old 08-22-2013, 10:09 PM   #3
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Rooms over a unconditioned garage are often leaky and poorly insulated. Agree with previous comments regarding spray foam methodology.
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Old 08-22-2013, 11:56 PM   #4
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You need to decouple the ceiling/framing from garage temps, Figs. 3, 7;
Cover with 5/8" Type X drywall, paper tape seams- no holes for car exhaust to living space.

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17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
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Old 08-23-2013, 08:37 AM   #5
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Your best bet would be to use a closed cell spray foam. This will act as your vapor barrier, sealing every crack and crevice, and give you lots of r value. You can put some fiberglass under that for some sound proofing and additional r value. Make sure to use 5/8" drywall and seal all joints to prevent co2 from cars to enter home
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Old 08-23-2013, 09:44 AM   #6
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for what it's worth, incomplete combustion produces carbon monoxide (CO) an odorless colorless toxic gas, complete combustion produces carbon dioxide (CO2), which is heavier than air and can displace oxygen in sufficient quantities.

carbon monoxide is also one of 8 gases that are lighter than air.

Spray foam would be an excellent way of insulating as well as air sealing.



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