Thermal Bridges - Summary
Thermal bridges are locations in the building envelope where more heat flows outward than through the adjacent building components. They not only increase the heating load but can also lead to moisture damage and mold.
What is a Thermal Bridge?
A thermal bridge occurs when heat flow is concentrated or accelerated at a specific location. This happens through:
- Geometric effects: Corners, edges, protrusions
- Material changes: Highly conductive material penetrates insulation
- Constructive weak points: Missing or interrupted insulation
The Three Types of Thermal Bridges
- Geometric thermal bridges: Created by the shape of the building (corners, edges)
- Material-related thermal bridges: Created by material changes in the construction (steel beams, concrete)
- Constructive thermal bridges: Created by structural details (window connections, roller shutter boxes)
Thermal Bridges and Moisture Damage
Thermal bridges lead to lower interior surface temperatures. When the surface temperature falls below the dew point of the indoor air, moisture condenses – mold risk!