What Is Thermal Bridging?

Thermal bridging occurs when heat flows through materials that are more conductive than surrounding insulation, creating pathways for increased heat transfer through a building assembly.

In roof systems, thermal bridges often form where structural elements interrupt insulation continuity.

How Thermal Bridging Occurs in Roofs

Roof assemblies contain framing members, fasteners, and connections that can conduct heat more readily than insulated areas.

• Framing members passing through insulation
• Metal fasteners and connectors
• Edges, penetrations, and transitions
• Discontinuous insulation layers

Why Thermal Bridging Matters

Thermal bridging increases heat loss in cold conditions and heat gain in warm conditions. It can also lower surface temperatures enough to promote condensation.

Over time, these effects can reduce energy performance and contribute to moisture-related issues.

Thermal Bridging and Roofing Performance

Managing thermal bridges helps maintain consistent interior temperatures and supports long-term roof durability. Continuous insulation strategies are often used to reduce bridging effects.