Trim Linear Footage and Miters
Trim = (perimeter - door openings) x (1 + waste%), pieces = ceil(net/stock); corners are 45-deg miters (base/casing) or a crown compound cut. 70 ft perimeter, 6 ft openings, 10% waste, 16 ft stock -> 70.4 ft, 5 sticks; a 38-deg crown corner is ~31.6 miter / 33.9 bevel cut flat. Verify on a scrap.
Formula and source
net = (perimeter - openings) x (1 + waste%); pieces = ceil(net / stock); crown miter = atan(sin(spring) tan 45), bevel = asin(cos(spring) sin 45); else 45-deg miter.
Trim linear-footage takeoff and the crown-molding compound-cut angles, finish-carpentry practice, by name.
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