I-joists/LVL: holes, notches and services

Prevent plumbing, duct or cable routing from turning an engineered joist into a structural repair.

VERT / GREEN

Identify manufacturer, series and depth before any drilling.

JAUNE / YELLOW

Permitted openings depend on the product and location; solid-lumber rules must not be transferred to I-joists or LVL.

ROUGE / RED

Cut/notched flange, undocumented large hole, opening near bearing or existing damage: engineer/manufacturer review before alteration.

Interactive triage

Helps choose the next step; it does not replace design, permits or professional diagnosis.

Manufacturer reference available
Use only zones/sizes explicitly permitted for that product. Flange affected
Stop; flanges are critical to joist behaviour. Opening near bearing/load
Verify capacity and any repair detail. Services not yet coordinated
Coordinate routes before close-in to avoid improvised holes.

Useful tools and data

Joist label/manufacturer
Service routing plan
Structural plan

What the professional checks

Check manufacturer tables
Assess existing damage
Design repair if needed

Official sources

Checked 2026-08-22.

V16

Advanced diagnostics to cross-check

V16 connects water, soil, climate, safety, materials and seasonal use to existing projects.

Roof snow and ice

V31

Commissioning and everyday safety

V31 helps verify systems after work and document the values that make a home safer to operate.

HRV/ERV: frost, condensate and balancing

V47

V47 interfaces not to miss

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

Joist notches/holes