Blown Insulation Coverage
The bags of blown insulation an attic needs at a target R, from the area and the manufacturer's bags-per-1,000-sq-ft figure, with the minimum installed (settled) thickness.
Formula and source
Bags = ceil(area / 1000 x bags per 1,000); coverage per bag = 1000 / bags-per-1000; minimum thickness = target R / R-per-inch.
Manufacturer blown-insulation coverage charts (by name).
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