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

Explore: Systems to check before closing the work

Systems to check before closing the work

This section 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

Explore: Specialized diagnostics to verify

Specialized diagnostics to verify

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

Home lift

Explore: Household safety and compliance details

Household safety and compliance details

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

Interior stairs, handrails and guards

Explore: V47 interfaces not to miss

V47 interfaces not to miss

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

Joist notches/holes