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We read every message. The fastest way to reach us is by email:

Helpful things to include

Reporting an error: the calculator’s address, the numbers you entered, the result you got, and what you expected.
Product data changes: a link to the manufacturer’s current label or data sheet.
Calculator ideas: what you were trying to work out and what you buy the material in.

We can’t give advice on a specific property or replace an on-site inspection. For that, please talk to a licensed insulation contractor or energy auditor. We usually reply within two business days.