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Old 08-11-2015, 12:19 PM   #1
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Need to Insulate Attic Spaces Grage/House


I read I need to use R30 for the attic. Im currently drywalling the ceiling of my garage and will add insulation to the top. Couple of questions:

I must use either a faced insulation or layer a plastic barrier over the insulation to avoid mold growth, correct?

Ive read to use R30 for the attic:
The garage I could use R30 but it is pretty expensive and I don't need a really good insulation for the garage. is there another reason why attic spaces should use R30? Is it really just dependent on if you want to get a permit to convert it to a room and by code it might require a certain R value?

The house has little to no crawl space in the attic. I just planned on blowing in insulation. But what about a vapor barrier? Is it ok to leave open, or how do you take care of something like this?
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Old 08-12-2015, 11:20 AM   #2
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Is the garage ceiling adjacent a living space floor?

What part of Southern California are you in? Unlikely that you require any additional vapor control other than what is provided by a well sealed sheet of drywall.
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Old 08-15-2015, 08:12 PM   #3
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Only Zones 14 and 16 require a vapor barrier;
(g)
Vapor Retarder
1. In Climate Zones 14 and 16 a Class II vapor retarder shall be installed on the conditioned space side of all insulation in all exterior walls, vented attics and unvented attics with air-permeable insulation; and
pp 231/268;https://www.google.com/url?sa=t&rct=...99804247,d.cGU


Your Zip code is in Zone 8, none required.-- http://www.energy.ca.gov/maps/renewa...ate_zones.html

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