ASTM E1980

ASTM E1980 is the standard practice for calculating Solar Reflectance Index for horizontal and low-sloped opaque surfaces. It provides a consistent way to estimate how a surface may reflect solar energy and release heat, which can be important for comparing roofing and similar building surface materials. By using a common calculation method, this ASTM standard supports more reliable product evaluation, specification, and compliance decisions in projects where surface thermal performance matters.

Overview of ASTM E1980

ASTM E1980 focuses on the calculation method used to determine Solar Reflectance Index, or SRI, for horizontal and low-sloped opaque surfaces. The standard is intended to bring consistency to how these surfaces are assessed, especially when comparing products with different solar reflectance and thermal emittance characteristics. In practice, ASTM E1980 helps users apply a uniform technical framework to surface performance evaluation, which can support product selection, documentation, and quality-related decision-making.

Common use cases of ASTM E1980

This standard is commonly used when evaluating roofing and other horizontal or low-sloped opaque surface materials where SRI is part of the specification or submittal process. It may be referenced by manufacturers, specifiers, contractors, and testing or quality teams preparing product data for comparison. ASTM E1980 is especially relevant when a project needs a consistent calculation basis for identifying materials that meet defined surface reflectance and heat-related performance criteria.

Benefits of using ASTM E1980

Using ASTM E1980 helps create a consistent and defensible approach to SRI calculation, which can reduce ambiguity during procurement and specification review. It supports clearer product comparisons, more orderly compliance checks, and better alignment between technical documents and project requirements. For teams evaluating horizontal or low-sloped opaque surfaces, this ASTM standard can also reduce risk by improving repeatability and limiting confusion around how performance values are derived.

• Standardized SRI calculation method
• Relevant to horizontal and low-sloped opaque surfaces
• Supports product comparison and specification review
• Useful for compliance and documentation workflows