Headers over openings sized per Tables R602.7 by span, opening, load tributary, and wall location

Description

Wall openings (doors, windows) require headers sized per Table R602.7(1) (exterior bearing), R602.7(2) (interior bearing), or R602.7(3) (non-bearing). The table inputs are span, ground-snow load, building width, and number of stories above. Built-up headers use two pieces of dimensional lumber with a ½ in spacer. Jack studs are required at each end per Section R602.7.5; the table gives required jack-stud count.

Why this exists

Header sizing is the most common architect-builder dispute on residential. Calling out the header schedule on the plans (size + jack count for each opening) is the only way to make the framer order the right material. Wide openings (8+ ft) often need engineered LVL or PSL headers rather than prescriptive dimensional lumber.

Categories

Applies to

• Jurisdiction: New York State

Source

Solver enforcement

Browsable only — the solver does not currently enforce this directive (no spec-level data to check against). This entry exists so the architect personas can cite it in conversation and the user can read what the rule says.

Related directives

• Habitable space minimum ceiling height · IRC R305.1
• Wind design · IRC R301.2.1
• Seismic provisions · IRC R301.2.2
• Snow loads · IRC R301.2.3
• Floodplain construction · IRC R301.2.4