What is the moisture permeability rating of 6mm poly?

The moisture permeability rating of 6mm poly is indeed 0.03 US perm. This low rating indicates that 6mm poly is a relatively effective vapor barrier, meaning it offers significant resistance to the passage of moisture. In building applications, this characteristic is particularly beneficial as it helps prevent moisture from penetrating walls and other structures, which can lead to issues such as mold growth and degradation of building materials over time.

Understanding the importance of vapor barriers in building construction and design is crucial, as they play a vital role in maintaining the integrity and longevity of structures. When selecting materials for moisture control, it's essential to reference these permeability ratings to ensure the chosen materials will meet the intended performance requirements.