Contact
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Email hello@materialguides.com. Replies usually come within two business days.
Reporting an error
If a calculator gives a number that looks wrong, include the values you entered and the result you expected. Corrections are checked and, when confirmed, fixed and noted with an updated date on the page.
What we can't help with
We can't give project-specific engineering, code compliance or contractor advice. For those, contact your local building department or a licensed professional.