Which standard pertains to non-roof calculations for heat island reduction?

The standard that pertains to non-roof calculations for heat island reduction is ASTM E903. This standard provides a method for measuring the solar reflectance of materials based on laboratory tests. In the context of LEED certification, especially regarding heat island effect strategies, it is crucial to assess how exterior surfaces, such as pavements and walkways, manage solar heat gain. ASTM E903 specifically outlines the procedures for determining reflectance, which is essential for evaluating the potential of materials to reduce heat islands.

In LEED v4, while there are requirements related to heat island reduction strategies, it is ASTM E903 that specifically supports the calculations needed to substantiate claims for the performance of non-roof surfaces. The other options—ATS, which generally covers different energy systems; LEED v4, which encompasses a broader framework but does not specify calculation methods for non-roofs; and FGI, which primarily provides guidelines related to facility design—do not focus on the measurement methods for solar reflectance relevant to heat island reduction.