For R30, 16"W x 48"L 11 batts, what does that 11 batts mean? How many feet comes in one bag?
Home depot R-30 shows 58.67 total square foot coverage divided by the width of batt = 1.33 = 44.11 divided by each one is 4' long = 11 pieces. http://www.homedepot.com/Building-Ma...1#.UTfdI1KsnAU
Keep in mind, R-30 is one of the lowest density batts out there at 0.57# per cubic foot- compress it to R-26 (medium density) or further still to R-15 (high density, pp.41;http://www.huduser.org/Publications/pdf/walls.pdf), compare Roxul at >2lbs/ft3; http://www.roxul.com/files/RX-NA-EN/...th%20steel.pdf
Air seal the attic first, and use a housewrap over the low density batts to prevent wind-washing degrading you thermal barrier.
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