Does embossing complicate reflectivity/emissivity measurements?
Certain tests that are employed for measuring solar reflectivity cannot be used if the surface is highly embossed. Typically, apparatus that use small samples require flat surfaces. Variegated roof surfaces would require ASTM E1918, the pyranometer procedure, as the test. Smooth surfaces can be tested with a wider variety of test methods including ASTM E408 and C1459. We recommend measuring reflectivity/emissivity values on the smooth surface before it is embossed.
Related Questions
- Remember that emissivity and reflectivity both play a part in the surface temperature of a roof. Back to Top Why does a white prepainted metal roof have a much higher emissivity than an unpainted metal roof?
- What happens to reflectivity and emissivity after half the lifetime of the roof (meaning after more than 3 years)?
- How do I find out the Solar Reflectivity, Emissivity, and Solar Reflective Index value of coatings?
