Frequently Asked Questions
What target R-value should I use?
Check the U.S. Department of Energy recommendation for your climate zone. Attics commonly target R-38 to R-60.
How is insulation thickness calculated?
Divide the added R-value you need (target minus current) by the chosen material R-value per inch to get the required thickness in inches.
Why does spray foam need fewer inches than batts?
Closed cell spray foam has a high R-value per inch (about 6.5), so it reaches a target with less thickness than fiberglass batt at about 3.1.
What are board-feet?
A board-foot is a volume of one square foot at one inch thick. It is a convenient way to estimate how much insulation material to order.
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Estimates for informational purposes only.
Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.