Cantilevered balcony/slab: thermal bridge, condensation and corrosion

A slab or steel element crossing the envelope can chill interior surfaces and concentrate water, salts and corrosion at the interface.

Triage only — not a design.

VERT / GREEN · JAUNE / YELLOW · ROUGE / RED

Condensation, mould or frost indoors at balcony line Spalled concrete or exposed reinforcing/anchor steel New insulation conceals the junction without a detail Structure-envelope detail documented

No signal selected.

What the professional checks

The professional checks load path, corrosion, drainage, waterproofing, thermal bridge, surface temperature and air/insulation continuity.

Official sources

Checked: 2026-08-24

Related path

Continue with the right tools

These links connect this page to the next useful checks and decisions without repeating the full content.

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