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By russell, June 25, 2009 12:35 am

Description:

These 12” by 36” granular surfaced shingles are installed on slopes of 2 inches per running foot or greater.  They are installed over a felt under layment of usually a 15 or 30 pound felt, depending on the slope.  Shingles come in weights between 180 and 400 pounds per 10’ X 10’ or 100 square feet.

Uses:

The basic shingle is a commodity product typically used for residential applications.  Shingles may also be used on vertical parapet wall applications, provided special fastening patterns are followed.

Approximate Life Span:

The greater the slope of the roof, the faster the water runs off.  This is a determining factor in the life expectancy of the shingle.  The heavier the shingle, the longer the wearing surface lasts.  If shingles are dark in color and lightweight(180 lbs) expect a life of  7 to 9 years.  For a 400 pound fiberglass shingle, you can expect about 17 years.  For weighs somewhere in the middle, expect a life of about 12 to 15 years.

Caution:

• Stay with lighter colors for longer shingle life expectancy.

• Shingle exposure should be carefully measured to insure proper installation patterns.  A small error can throw off the entire roof pattern and allow leaks to occur.

Limitations:

Shingle manufactures require a minimum slope of 2” in 12”.  If you go below this and have a “blow off, “ your insurance company may not cover the damage.