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As I've described before, I have a semi flat roof of flash down, bituminous (black) membrane. My scenario doesn't necessarily apply to your application but illustrates the difference in surface temps. After about two years, I applied a glacial white elastomeric coating. It wasn't as simple as just painting it on. It needed two coats of asphalt emulsion followed by two coats of the elastomeric coating. I used an infrared, hand held thermometer to measure the temperature before I applied it & afterwards. At ten to twelve AM, the temperature on a clear, sunny day was around 170 degrees. After the coating, it was between 100 & 110 degrees. So applying a coating like that reduced the surface temperature significantly. I also have good venting and ceiling insulation. Here the ratio of ventilation to floor space is code.
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Marv Evans
'69 911E
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