Thermal bridging: identify the path and route the correction or design question
An apartment building has an exposed concrete balcony edge beside insulated infill walls. The foreman is asked to fix the cold edge with thicker batts. Before proposing a change, she needs to identify the heat-flow path, the actual designed interface and what her crew can correct under the approved detail.
Look for paths through or around the thermal layer before assuming more cavity insulation is the answer. A design interface and a workmanship gap can both matter, but they need different responses. Mark the location, compare the actual condition with its current detail and ask the responsible reviewer about the performance question. Do not modify structural supports or attachment systems to remove an apparent bridge.
Separate the heat-flow question from the correction authority
- Locate the potential bridge. BC Housing describes thermal bridges as concentrated heat-flow paths created by conductive elements through insulation or misaligned insulation planes. Look at the project’s studs, floor edges, balcony connections, shelf angles and cladding attachments in their actual details. These examples help locate questions; they do not establish a calculated loss or defect simply because metal or concrete is present.
- Compare the condition with the approved assembly. Check continuity, component position and the referenced interface detail. Separate an installation departure, such as a missing specified piece, from an installed feature that matches the design but raises a performance question. Record what is visible and what is concealed. A photograph cannot establish the effective whole-building result or an unseen interface’s condition.
- Give the two issues their proper routes. Correct workmanship through the approved method, access and quality process. Ask the responsible design team about structural or attachment interfaces and any proposed change to the thermal layer. Avoid promising that thicker batts remove a path through a slab or that cutting a support is acceptable. Needed technical review remains part of the answer.
- Keep the resolution located and checkable. Record the observation, detail revision, responsible response and resulting inspection or follow-up. Identify other locations that may need the same comparison without assuming they are identical. Where performance investigation is required, use its qualified scope and suitable conditions. A thermal image can inform an investigation; interpreting its colours alone is not a complete diagnosis.
Common mistakes
- Assuming every visible conductive element is an installation defect.
- Promising more batts will interrupt a structural path.
- Altering supports or attachments without their technical approval.
- Treating thermal-camera colours as a complete diagnosis.
Checklist
Record a thermal-bridge question with
- Located conductive path or interrupted thermal layer.
- Current assembly and interface reference.
- Observed departure distinct from design concern.
- Correction authority or responsible design answer.
- Required check, remaining limits and comparable locations.
Check your understanding
The balcony connection matches the drawing, while a nearby insulation piece is missing. Should both receive the same correction?
