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Brief description from Roof Replacement Materials above :
The difference between asphalt and fiberglass shingl es can be confusing – even for roofers. Part of the confusion is due to the fact that fi berglass shingles are made from asphalt, and really should be called "fiberglass-asphalt shingles." Both types of shingles have a base mat that is surfaced with mineral aggregates. In organic asphalt sh ingles, that base mat consists of felt made from rags, and paper wood pulp that is saturat ed and coated with asphalt. In fiberglass-asphalt shingles, the mat is made from glass fiber ma t coated with asphalt. Although fiberglass shingles have a better fire rating than organic asphalt, both are considered acceptable.
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