Insulation Batt Coverage and Count
Batts and bags from the net cavity area / coverage per batt and per bag, at a waste allowance. 500 ft^2, R-13 batt (10.67 ft^2), 88 ft^2/bag -> 47 batts, 6 bags; a deeper R-21 bag covering 67 ft^2 raises it to 8 bags for the same wall. Count the batts to confirm a full fill. The label coverage governs.
Formula and source
net = area x (1 + waste%); batts = ceil(net / coverage_per_batt); bags = ceil(net / coverage_per_bag).
Batt insulation takeoff from the manufacturer's label coverage per batt and per bag, by name.
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