How Is Thermal Bridging Identified and Mitigated in Design?

Thermal bridges are located by auditing every structural and cladding element that penetrates the insulation layer, then mitigated with manufactured thermal breaks (e.g., at balconies and parapets), continuous insulation over the bridge, or thermally broken connection redesign. Beyond energy loss, bridges cause interior cold spots, condensation, and mold — mitigation is both an energy and a durability measure. The energy angle gets the attention, but the durability angle should: a thermal bridge is a future mold location drawn into the building's details. Owners rarely complain about the heating bill with the specificity they complain about mold. I mitigate bridges for both reasons and lead with the one the owner will actually see.

I audit bridges systematically at the detail level, because that is where they hide. The floor-line slab edge gets checked in every wall section. Balconies and canopies get a decision: thermal break, self-supporting structure, or acceptance of the bridge with CI mitigation. Parapets get evaluated for whether the roofing insulation can wrap them or a break is needed. Cladding support systems get reviewed for their conductivity — a continuous steel angle is a bridge; isolated clips at spacing are a much smaller one. Penetrations get the same treatment: structural steel passing through the envelope, rooftop equipment curbs, and piping supports. Each one is small, but buildings have hundreds of them, and the aggregate matters. The audit is a drawing review exercise — I trace the insulation plane through every detail and mark everywhere something conductive crosses it.

Not every bridge justifies a manufactured thermal break. I work through the options from cheapest to most engineered. My mitigation hierarchy:

• Eliminate: redesign the connection so nothing conductive crosses the insulation — self-supporting balconies, isolated parapets
• Break: manufactured thermal break elements where structure must penetrate — balconies, canopies, critical slab edges
• Cover: continuous insulation over the bridge where elimination is impractical — slab edges, shelf angles, clip systems
• Verify: interior surface temperatures checked against dew point for every significant remaining bridge
• Document: the bridge strategy recorded so energy modeling reflects the as-detailed assembly, not an idealized one