Engineering Reference Tables Directory
The full reference tables behind this site's engineering reverse-lookup calculators, in one place for quick scanning or printing.
Beam & joist span (illustrative, all sizes and spacings)
Full table behind the beam & joist span lookup, covering both 16" and 24" on-center spacing.
Water hardness classification (USGS bands)
Full table behind the water hardness calculator.
These are illustrative reference values for quick lookup, not a substitute for official code span tables, a structural engineer, or your water utility's own test results.