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Old 05-13-12, 07:34 PM   #35
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According to this

an article from the 4th Int Symposium on Roof Technology; Re use of fly ash in shingle manufacture:

"A common specification among shingle manufacturers is a limit to the free lime content in filler. Roofing industry experience has shown that an excess amount of lime can react with certain asphalt constituents to greatly accelerate granule loss from the shingle, resulting in premature failure of the roof."

Last edited by lucerne96; 05-13-12 at 07:36 PM..
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