Notches and holes in solid-sawn joists

Before plumbing, electrical or ventilation work, distinguish solid lumber from engineered joists and verify every cut location and size.

V47 · sources checked 2026-08-23

VERT / GREEN

Observe, document and maintain without altering the system.

Measure and diagnose before closing or repairing.

Stop DIY when structure, water, fire or heavy plumbing is involved.

Existing hole/notch near bearing Large new opening planned Joist already cracked/weakened No drilling planned

The professional identifies species/dimensions/span/bearings, measures holes/notches, checks shear/bending and designs reinforcement if needed.

V34

V34 connects use permits, soil, excavation, neighbouring structures and public-space logistics before hard-to-reverse work.