How much blown in attic insulation do I need?
This calculator should be used as an estimating tool ONLY.
To determine the number of bags of blown in insulation needed:
- Measure the depth of your existing insulation and enter this number below.
- Is your current insulation fiberglass (applied in rolls / batts) or cellulose (loose, sprayed-in material)?
- Based on your desired R-value, how many total inches of insulation do you need? (See map for regional recommendations.)
- Enter the dimensions of your attic.