Rating System

LEED BD+C: New Construction

Rating System Version

v2 - LEED 2.0

Inquiry

Roofing and roof coating specified for the UC Merced Library/Information Technology Center were confirmed by the manufacturer to have an emissivity of 0.9 (as well as the required Energy Star reflectivity). However, the design team recently discovered that the testing method used for determining the emissivity was ASTM C1371, rather than the ASTM E408 method that is referenced by LEED. According to the team\'s correspondence with a manager at the Cool Roof Rating Council (coolroofs.org), the use of the C1371 standard is very common; furthermore, the CRRC recognizes both of these ASTM testing methods as equivalent and accepts both methods\' emissivity data for inclusion in the CRRC\'\'s roof products rating directory. The CRRC also said that this issue has been brought to the attention of the relevant USGBC Technical Advisory Group for discussion. Please confirm whether the USGBC will accept the ASTM C1371 emissivity testing standard for roof products that have not undergone ASTM E408 testing.