The methods behind the calculators, written out. Everything here traces to the same published sources the tools print under their results.
Why shelves sag, why they keep sagging (creep), the 0.02 in/ft line, and the five fixes ranked by how much they actually help.
GuideMaximum spans for the woods people actually shelve with — computed from USDA stiffness data at three load levels.
GuideFiber saturation, radial vs tangential, why quartersawn moves less, and the allowance each kind of joint needs.
GuideWhat equilibrium moisture content means, the numbers for real rooms, and what to build at.
GuideAll 50 species ranked by modulus of elasticity — and why stiffness is only half the shelf story.
GuideSpecies ranked by total shrinkage, plus the quartersawn lever that halves movement in any species.
GuideThe formula, nominal vs actual sizes, and honest waste factors by project type.
GuideWhy drawer banks graduate, the geometric method behind the proportions, and when equal fronts are fine.