Concrete balcony: spalling and reinforcement corrosion

Triage cracks, delamination, spalls, rust, drainage and guards before a surface patch hides structural deterioration.

VERT / GREEN

Photograph cracks/spalls and track change without knocking loose concrete over occupied areas.

JAUNE / YELLOW

Water, salts, carbonation and inadequate cover can lead to reinforcement corrosion, cracking and spalling.

ROUGE / RED

Exposed reinforcement, falling pieces, unstable guard, slab deflection or extensive corrosion: restrict access and obtain assessment.

Interactive triage

Surface spall, no steel visible
Determine depth/cause before simple patching. Visible/rusted reinforcement
Assess section loss, contamination and repair extent. Guard moves
Do not use balcony until anchorage/structure is checked. Drainage clear and no progression
Keep dated photos and monitor after freeze/thaw cycles.

Useful tools and data

Dated photos/crack map
Balcony/anchor plan
Water/de-icing history

What the professional checks

Assess delamination extent
Assess reinforcement corrosion
Design repair and guard anchorage

Official sources

Checked 2026-08-22.

SCHL — besoins de réparation des balcons

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 guardsCode versions

V15

Remaining system checks not to miss

V15 covers issues that can block a project, cause a loss or become expensive once concealed.

Before closing wallsPool/spa safetyPost-renovation commissioningCodes + climate by province

V16

Advanced diagnostics to cross-check

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

Jobsite safety and silicaCuring, drying and acclimation

V18

Specialized diagnostics to verify

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

Hot tub structure + electricalRoof deck over living space