JoistSpan
JoistSpan gives the allowable span for a floor joist, rafter, header or deck beam under the 2021 International Residential Code. Every number is cited to the exact table it came from, and anything the tables don't cover — point loads, unusual snow — goes to an engineer, not a rule of thumb.
Why it earned its spot
One narrow column on warm off-white, with letterspaced capitals in a muted olive heading each section and dark slate body copy beneath — closer to a printed code commentary than to a calculator. Six select menus sit in a plain unstyled row, and the answer below them is drawn rather than stated: a grey load bar reading 40 PSF LIVE / 10 PSF DEAD / L/360, two triangular supports, and a dimension line bracketing 11’10”, with the table citation in small grey type under it. For someone checking a span against what a plan reviewer will open, that drafting convention explains the result better than any label could.
The colors
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