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Registered
Join Date: Oct 2003
Location: London Ont Canada
Posts: 3,120
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I would use 1 1/2 or 2 in styrofoam SM (blue or pink here) not the white low density beadboard.
It should give you about R10 Run it horizontally as your ceiling and leave the 2x4 space above it for some ventilation under the roof. Code here requires a drywall cover for fire safety but you might not be concerned as your original plan was to use white 1/2 as a ceiling anyway. Less expensive would be just stuff the 2x4 space with batt insul and perhaps a 1/2 plywood ceiling. Easily painted and quite durable in a garage. The regular attic area would be best to use batts.
If concerned more about summer heat then a roof fan for the attic would be a good idea.
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1980 911 SC 3.6 coupe sold
1995 993 coupe
1966 Mustang Shelby clone
1964 Corvair Spyder Turbo gone
2012 Boss 302
Last edited by johnsjmc; 10-04-2012 at 05:16 PM..
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