Slab-on-Grade Insulation Calculator
Estimate slab-on-grade perimeter heat loss with the ASHRAE F-factor method, compare insulation strategies, and see annual heating cost and payback vs an uninsulated baseline.
Default slab example
- 180 lin ft perimeter, ΔT 70°F, 5,000 HDD
- Uninsulated baseline (F-0.73): $822/yr heating cost
- R-10 vertical 24" edge (F-0.52): $585/yr — saves $237/yr
- Frost-protected shallow (F-0.38): $428/yr — best long-term performer