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We read every message. The most useful ones tell us:
- An error: the calculator, the numbers you entered and what you expected.
- A missing calculator: the material, the unit your supplier sells it in, and its coverage or weight if you know it.
- A source: a better or more recent reference for a figure we use.
We can't give project-specific engineering, survey or legal advice. For structures, boundaries and permits, contact a licensed professional or your local building department.