Crawl Space Insulation Calculator

Crawl-space insulation depends on moisture strategy: sealed crawl spaces usually insulate the walls, while vented crawl spaces usually insulate the floor above. 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-19
  • R-value gap from current R-0: R-19
  • Order area with 10% waste: 770 sq ft
  • Estimated material cost: $1,317

Planning snapshot

  • Category: Retrofit
  • Typical use: Crawl-space walls, rim joists, and floor assemblies depending on whether the crawl space is vented or sealed.
  • Hot climate target: R-10
  • Mixed climate target: R-15
  • Cold climate target: R-19

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