Which type of insulation is often used with BUR systems?

Polyisocyanurate or fiberglass insulation is commonly used with Built-Up Roofing (BUR) systems due to their excellent thermal performance and moisture resistance. Polyisocyanurate insulation, in particular, provides a high R-value per inch, making it highly effective for energy efficiency in roofing applications. Furthermore, its closed-cell structure minimizes water absorption, which is critical in roofing environments where moisture can lead to structural issues over time.

Fiberglass insulation is another effective option within BUR systems, as it is lightweight and offers good thermal resistance. Both types complement the BUR system by enhancing energy efficiency and ensuring durability. This is especially important since BUR systems are designed to withstand various weather conditions, and reliable insulation contributes to the overall longevity and stability of the roofing system.

Other types of insulation mentioned may have valuable properties in different construction contexts, but they do not align as closely with the specific needs and performance criteria of BUR systems compared to polyisocyanurate and fiberglass insulation.