Span, load, coverage and installation equations.
Bending moment M = w L^2 / 8, stress = M / Z (Z = b d^2/6)Pass if deflection <= L/300 AND stress <= grade strengthFloor area = (Room length x Room width) in m2Area needed = Floor area x (1 + waste%)Plank area = Plank length x Plank widthPlanks = ceil(Area needed / Plank area)Packs = ceil(Area needed / Pack coverage)Never jump more than ~one grade (avoid over ~1.7x increase)Each grit removes the scratches of the previous gritRemove all dust between grits to avoid stray coarse scratchesEffective length Le = K x Height (K by end condition)Slenderness = Le / radius of gyration (r = sqrt(I/A))Euler buckling load Pcr = pi squared x E x I / Le squaredSafe if capacity >= load AND slenderness <= 180Dynamic pressure q = 0.613 x V squared (V in m/s, q in Pa)Design pressure = q x Terrain factor x Height factorWind force = Design pressure x Area x Force coefficientTotal bond area = Area per joint x Number of joints/facesGlue (grams) = Total area x Spread rate x (1 + waste%)Actual riser = Total rise / Number of risers (all equal)Pitch angle = arctan(Riser / Going), keep under ~42 degTemperature factor = 2 ^ ((25 - Temp) / 10)(drying roughly halves per +10C, doubles per -10C)Adjusted time = Base time x Temp factor x Humidity factorProject time = (Coats - 1) x Recoat + Full cure