Objectives

To measure the constructed surfaces ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation.

It will be assessed on

Computing the SRI and roof surface temperature based on solar reflectance and thermal emittance using ASTM standard E 1980. Reflectance is measured according to ASTM E 903, ASTM E 1918, or ASTM C 1549. Emittance is measured according to ASTM E408 or ASTM C 1371.

How it will be evaluated

SRI can be calculated based on the pitch of a roof, its weight, its solar reflectance and its thermal emittance (emissivity). Vegetation will be evaluated based on the planted species and their variety.

Concepts to be evaluated