For roofs with slopes less than 2:12, what is the required SRI?

For roofs with slopes less than 2:12, the required Solar Reflectance Index (SRI) is set at a minimum of 82. The SRI is an important metric in sustainable design, as it measures how well a roofing material reflects solar heat. A higher SRI indicates that the material is more effective at reflecting sunlight, which can lead to lower energy costs for cooling and reduced urban heat island effects.

The 82 requirement is specified to promote the use of roofing materials that contribute to energy efficiency and environmental sustainability. By using materials with a higher SRI, buildings can help mitigate heat absorption, ultimately reducing the need for air conditioning and improving comfort for building occupants.

In contrast, lower SRI values would not provide the same benefits regarding thermal performance and energy conservation. Roofs with lower reflectance may lead to higher temperatures in and around buildings, increasing energy usage and negatively impacting the local microclimate. This makes the SRI of 82 or greater the correct choice for maintaining these sustainability goals.