Hip / Ridge Cap Bundles and Roofing Nails by the Pound
The two accessories the shingle field takeoff leaves open: the hip-and-ridge cap bundles from the ridge and hip linear feet, and the roofing nails by the pound. IRC R905.2.6 steps the field pattern from four nails to six in the high-wind / steep rows, which moves the order by half again, and a pre-formed hip/ridge product covers far less per bundle than field-cut 3-tab caps. Cap pattern and nail density come from the product wrapper and the adopted wind zone. A material takeoff, not a nailing schedule.
Formula and source
cap_len_lf = ridge_lf + hip_lf; cap_bundles = ceil(cap_len_lf / cap_lf_per_bundle); field_nails = squares x shingles_per_sq x nails_per_shingle; cap_pieces = ceil(cap_len_lf x 12 / cap_exposure_in); cap_nails = cap_pieces x 2; total_nails = field_nails + cap_nails; nail_lbs = ceil(total_nails / nails_per_lb).
IRC R905.2.6 (the asphalt-shingle fastening pattern: four nails standard, six in the high-wind / steep-slope rows) and the shingle manufacturer's application instructions, by name; the cap-bundle and nail relations are first-principles arithmetic.
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