Why is rigid foam board for exterior walls widely used in modern building envelopes?

Rigid foam board for exterior walls is widely used because it provides continuous insulation that reduces thermal bridging through structural framing. When installed on the outside of a building, rigid foam boards create a thermal barrier that improves the overall energy efficiency of the wall assembly. This method is commonly used in energy-efficient residential buildings and commercial structures where strict insulation standards must be met. Exterior rigid foam insulation also protects structural components from temperature fluctuations and moisture exposure.


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