Stair opening: joists, headers and load path

Creating or enlarging a stair opening cuts joists and concentrates their reactions into headers and supports that must be designed before cutting.

Triage only — not a design.

VERT / GREEN · JAUNE / YELLOW · ROUGE / RED

Bearing joist must be cut without structural detail Opening enlarged near beam, wall or post Stair moved after finishes/services were planned Headers, connections and supports documented

No signal selected.

What the professional checks

The professional checks loads, span, headers, trimmers, connections, supports, vibration, clearances and service interfaces.

Official sources

CNRC — Code national du bâtiment 2025

Checked: 2026-08-24

V14

Systems to check before closing the work

V14 connects envelope, air, fire, structure, water and code instead of treating each project in isolation.

Renovation dependenciesDeck, stairs and guardsLoad-bearing walls and openingsCode versions

V18

Specialized diagnostics to verify

V18 connects systems that become costly or regulated when a primary project triggers them.

Home lift

V29

Household safety and compliance details

V29 connects smaller risks that often fall between finishes, appliances, plumbing and local code.

Interior stairs, handrails and guards

V47

V47 interfaces not to miss

These details are small on a drawing but can control water, structure or durability.

Joist notches/holes