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Another question that I asked the Owens corning Tech Line was: Does Owens Corning

recognize that the limestone filler used in fiberglass shingles constitute the host source

for the algae? They maintain that it does not. When asked what is the host source beside

water and sunlight...that were very evasive. Just kept talking about it being an airborne

spore.

It would not surprise me that one day all the manufacturers will be dragged into a

class action algae suit. Very guarded on the answers. And as I mention before, a

rep from another manfr has said that they are switching to a non-limestone filler.

Minks