How many blown-in insulation bags should I plan?
Use R-value guidance only to choose a target; use the exact local product label for coverage and minimum installed depth. Both the minimum bag count and depth markers must be checked onsite.
Method
Net area equals measured attic area minus exclusions. Whole bags use the exact label coverage for the required added R, then an editable reserve and bag cost create order scenarios.
Important limitation
This cannot approve local code, fire clearances, recessed lights, moisture, ventilation, air sealing or energy savings. Exact product instructions and a qualified inspection control.