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Old 05-18-2013, 07:57 PM   #1
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Need help with workshop


I have a small 12x32 garage with a lofted attic. It is 2x4 walls. I lie in the desert and want to insulate as much as possible from the crazy summer heat, and cold winter nights. I would like to know if I can use 3/4" foam board next to exterior sheathing, than 3.5 inches of fiberglass. I know the fiberglass will compress a little bit. Is this ok or should I use the silver Bubble wrap stuff instead of the foam board?

Should I Use foam board or bubble wrap for the celing, closest to the crawl space?

And what about the loft. Same question. Foam board or silver bubble wrap up against the roof with insulation filling the cavity?

I really want to maximize insulation so I my AC doesn't work so hard when I am working in there. Thanks

If there is anything I haven't thought of please point it out. I have more energy than brains.


Last edited by thefishkiller; 05-18-2013 at 08:00 PM.
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Old 05-18-2013, 08:15 PM   #2
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Loose the loft and put up a real ceiling with insulation.
Make sure there's a ridge vent and soffit vents.
2 X 4 will not give you the needed room to properly insulate. There can be built out with 2 X 2's.
http://www.energystar.gov/index.cfm?...sulation_table

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Old 05-18-2013, 08:19 PM   #3
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It is a real ceiling. By loft I just mean its an attic you can almost stand up in. there is already plywood on top of the roof rafters. the roof and celing are 2x8.
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Old 05-19-2013, 05:43 AM   #4
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Then use R 19 in the ceiling and cover with drywall.
Just sealing off that attic space from the conditioned envelope will make a huge differance.
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Old 05-19-2013, 06:01 PM   #5
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Some other options; http://www.buildingscience.com/docum...rchterm=attic+

http://www.buildingscience.com/docum...n-roof-venting

Solar chimney, pp.18; http://www.buildingscience.com/docum...n-technologies

This should keep you busy a while, lol; http://www.buildingscience.com/docum...ifornia-attics

Figure 10% less shingle life for unvented; http://www.buildingscience.com/docum...on?full_view=1

Asphalt shingles/foam thickness for Zone 3, Table 4: http://www.buildingscience.com/docum...study-analysis

Radiant: http://www.mytexasinspector.com/pdf/...heet%20DOE.pdf

Gary
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