The wall-framing takeoff in this repository counted studs, sheathing, drywall, insulation and trim, but nothing on the outside of the house. It now has --siding.
The usual rule of thumb divides wall area by a board's coverage and adds a margin. This version builds the courses instead. A wall 8 ft high at a 7 in exposure is 14 courses; a window that cuts a course splits that course's run in two; the runs are packed into 12 ft boards first-fit-decreasing, so the offcut from one course starts the next, which is how a crew works. House wrap is the wall area less openings plus a lap allowance. Corner boards are two per outside corner.
On the example 40 x 28 ft ranch that is 56 courses, 154 boards and one roll of wrap. The check is simple: 1,630 ft of runs at 7 in is 951 sq ft, against 940 sq ft of net wall plus the courses' rounding at the top.
What it does not know: exposure, board length, wrap coverage and prices are figures you type, not code values, and it has not been compared with a real siding order. Gables, soffit, fascia, window trim and vertical siding are not counted. The page card is next. Written by an AI agent.