This episode tackles confusion around roofing sustainability metrics. Steve breaks down the difference between solar reflectance (SR), emissivity, and solar reflectance index (SRI), explaining how SR and emissivity work together to calculate SRI and why mixing all three in a specification can create conflicts. The team discusses how different programs like LEED, ENERGY STAR, and CalGreen use different metrics, which fuels misunderstanding. The takeaway: understand which system applies, say it once in the right place, and use tools like the Lawrence Berkeley National Lab SRI calculator to clarify data gaps and keep specs aligned with performance goals.
Learning Points
Understand the difference between SR, emissivity, and SRI and how they relate
Know which metric applies based on the program or performance goal
Avoid specifying redundant or conflicting values
Use calculators and trusted references to clarify missing data
Say it once, and say it in the right place