Contact

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What to include

• Calculation errors: the page address, the inputs you entered, the result you saw, and the result you expected. We check every reported calculation against an independent recomputation.
• Source problems: the page and the source link that is broken or out of date. If a manufacturer has changed a published yield, a link to the current document helps.
• Privacy requests: see the privacy policy for what data this site handles.

We can't give project-specific engineering or code advice. For structural questions, ask a licensed professional or your local building department.