This chart is for use in areas where yearly temperature changes do NOT exceed 100 degrees Fahrenheit. Keep in mind that the temperature of the roof material is always higher than the air temperature.
This chart is for use in areas where yearly temperature changes do NOT exceed 150 degrees Fahrenheit. This chart applies to most places in the U.S. Keep in mind the temperature at the time of installation. On a cold day the material is contracted so make room for expansion. On a hot day the material is expanded so make room for contraction.
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