Framing, stairs and trim

Studs from a wall length and the wall length back from a stud count; what may be bored and notched through one once it is up; rise, run and stringer drop cut for a flight; handrail length; skirting, architrave and crown moulding by run; and board feet against cubic feet for anything bought by the plank.

Whether the figure is a count or a length, because this family converts between them constantly and the two answer different questions. A stud count prices a delivery; the wall length prices the sheet goods, the insulation and the plate. The stair pages are stricter still — a rise divided into equal risers is arithmetic, and the tolerance between the largest and smallest as BUILT is what an inspector measures.

Engineered timber, joist and rafter spans, and anything else that is sized by a load rather than counted along a length.