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Thermal Bridging

How it works: Learn how to improve the effectiveness of insulation

Thermal bridging is a major cause of heat loss in houses. Even the best-insulated house will lose conditioned air if the walls are framed conventionally. Martin Holladay, a senior editor at, explains the process of thermal bridging in this "How It Works" article, and how even ideally insulated houses can become heat losers because of it. An illustration shows ways to break thermal bridging in roofs, top plates, walls, and foundations.

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