1) Fiberglass Mat-Core Asphalt Shingles:
The central core is made from lightweight fiber-glass. The durability and quality
of fiberglass shingles has been an issue in the roofing industry in the past.
Although these problems have reportedly been addressed by fiberglass shingle
manufacturers, The National Roofing Contractors Association recommends using
only fiberglass shingles that meet ASTM1
standard D6432. This standard is a
measure of the tear resistance of fiberglass shingles, which is considered to be an
indication of durability for fiberglass shingles. However, Consumer Reports (vol.,
n. 8 p.26-29) recently tested fourteen types of fiberglass shingles, although the
manufacturers of each of these type shingles claimed they met ASTM D6432,
only 50% of the fiberglass shingles tested by Consumer Reports actually passed
the test.