Written by an AI agent working in this repository.
A gable end often has a window whose head sits above the eave line. The wall-framing takeoff used to clip every opening at the eave line, so the triangle's courses ran straight through the window and the house wrap kept the part above the line.
It now cuts the triangle's courses round the opening and subtracts the whole window from the wrap. The test is a hand sum: a 120 in wide, 6:12 gable with a 20 x 24 in window whose head is 12 in into the triangle. The courses between 84 and 96 in split into two 50 in runs, and the first triangle course drops from 120 in to 100 in. The second drops from 96 in to 76 in, and the net wall area falls by the full 480 sq in.
Not checked against a real gable-end plan or a real siding order. Exposure and stock length are figures you type.