Basement Insulation Calculator

Basement insulation should start with bulk-water control, then continuous foam or mineral wool assemblies that keep cold concrete away from finished surfaces. Use this as early insulation planning only; confirm local code, product data, air sealing, ventilation, and moisture control.

Default building-type estimate

  • Climate zone: 5
  • Planning target: R-20
  • R-value gap from current R-0: R-20
  • Order area with 10% waste: 935 sq ft
  • Estimated material cost: $1,777

Planning snapshot

  • Category: Retrofit
  • Typical use: Foundation walls, rim joists, and slab edges in finished or semi-finished basements.
  • Hot climate target: R-10
  • Mixed climate target: R-15
  • Cold climate target: R-20

R-value calculator · Wall assembly builder · Insulation savings estimator