What values does the CRRC list for roofing materials?

The Cool Roof Rating Council (CRRC) provides critical performance values for roofing materials, specifically both reflectivity and emissivity. Reflectivity measures the amount of solar energy reflected by a roof surface, which contributes to the overall temperature management of a building. High reflectivity can reduce the heat absorbed by roofing materials, leading to lower cooling costs and improved energy efficiency.

Emissivity, on the other hand, indicates how effectively a surface can radiate heat away. Materials with high emissivity are better at releasing heat back into the atmosphere, contributing to energy conservation during warm periods.

By listing both reflectivity and emissivity, the CRRC allows for a comprehensive evaluation of roofing materials' thermal performance. This dual focus enables architects, builders, and homeowners to make informed decisions that can enhance energy efficiency and comfort while adhering to sustainability practices. The inclusion of only one of these metrics or thermal performance alone would omit important aspects of how roofing materials interact with solar heat, thus limiting their usability in building applications aimed at energy efficiency.