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As described earlier, the ceiling joists are 2x4's (at 2' on center) and has quite a bit of light weight storage above it. I agree with jklingel about using the R-11 (3.5" glass) at the ceiling and would love to be able to run 6" batts or blow in insulation but, I don't want to think of moving...

I really do appreciate the advice. It's been very helpful. What a great website!

Thanks for your advice guys. I'm located in middle Tennessee. The exterior is also block with a couple coats of Kilz (for concrete application). If I were to install a ceiling, I would probably use 1/4" OSB (about $6.00/sheet) and seal the joints. One problem is, I do store things up in the roof...

I ha ve a detached 30' x 30' (outside dimensions)8" block garage with 2"x4" wood truss roof. Inside dimensions are 28'-9" x 28'-9". Top of the block is 9'-7" (eave height) and peak height is 14'-10". The garage is not insulated whatsoever. I have two uninsulated aluminum panel overhead doors...