What does a material test assess in relation to air barriers?

When assessing a material test in relation to air barriers, the focus is on verifying permeability at recommended thickness. This is crucial because the primary function of an air barrier is to control air movement into and out of a building. By testing the material for permeability, one can ensure that it meets the specified standards for reducing air leakage, which is a fundamental aspect of effective air barrier performance.

The permeability of a material is measured to determine how well it can resist the flow of air while still allowing vapor diffusion as necessary. This ensures that the material maintains the intended performance under various conditions. Properly evaluating permeability helps to inform choices regarding which materials will best contribute to the overall effectiveness of the air barrier system, directly impacting energy efficiency and indoor air quality.

In contrast, while code compliance, overall system integrity, and post-installation leakage are all important aspects of building performance, they do not specifically address the material's ability to limit air permeability, which is critical for the air barrier's intended function.