Balconies and cantilevers act like radiator fins if not thermally broken. Learn how to incorporate structural thermal breaks into your envelope design.
Overview
Concrete balcony slabs extend through the thermal control plane, causing massive heat loss and condensation risk. Structural thermal breaks isolate the slab thermally while still transferring load. This article explores common systems and connection details.
Solutions and Design Tips
- Use modular thermal break modules like Schöck Isokorb or Halfen HIT
- Coordinate layout with rebar detailing and fire ratings
- Extend air and water barriers to the face of the slab edge
- Use slab edge insulation where full thermal break is not feasible
🔍 Quick Picks
- Thermal Break Module: Precast Structural Thermal Break (generic)
- Slab Edge Insulation: Foamular XPS Rigid Board
- Air Barrier Integration Tape: 3M All Weather Flashing Tape
Energy and Code Impact
Thermal breaks at balconies can reduce edge heat loss by over 80%. Many energy codes and green rating systems now award credit for their use. Infrared thermography shows dramatic improvement when used properly.
Conclusion
Use structural thermal breaks to maintain envelope integrity at cantilevers and slab projections. This improves comfort, energy efficiency, and durability of the entire wall system.
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