What it does
Selects the lightest adequate prestressed hollow core floor/roof plank from a manufacturer load-table database (Stubbe's Precast 8"/203, 10"/254, 12"/305, and 14"/356 mm slabs, each with 3–11 of ½" 1860 MPa strands). The user enters a simple span (centre-to-centre) and the superimposed dead plus live/snow load in metric (m · kPa) or imperial (ft · psf); the tool linearly interpolates the tabulated total allowable superimposed uniformly distributed service load at that span for every thickness/strand pattern, compares it to the demand, ranks all passing options by thinnest plank then fewest strands, and recommends the most economical adequate plank. Shows a full options table (allowable, utilization, pass/fail) for the queried span, the selected slab's section properties (A, Iₓ, yᵦ, b_w, Sw, f_pu, f′c, f′ci) in both unit systems, and the complete manufacturer load table per thickness with the queried-span column highlighted and each cell coloured pass/fail against the demand.
Flags spans limited by strand development length and the 10" L/360 live-load deflection note. Runtime JSON database import, copy/JSON/print export. 0 in⁴) where the printed guide exponent appears to be a typo.