Which is NOT a function of barrier materials used in construction?

Barrier materials in construction serve several vital functions, including preventing moisture accumulation, controlling air movement, and providing thermal insulation. These functions are essential for maintaining the integrity and efficiency of building envelopes.

Choosing the option that states barrier materials "only provide one function each" highlights a misunderstanding of the role of these materials. In fact, many barrier materials are designed to accomplish multiple objectives simultaneously. For instance, a vapor barrier can prevent moisture infiltration while also serving as an air barrier, and insulating materials can help with both thermal control and moisture management.

Therefore, the assertion that barrier materials provide only one function each is not accurate, making it the correct choice in this question. It is crucial for those involved in construction and building design to recognize that materials often have multifunctional capabilities, which can enhance building performance and sustainability.