Typical wear due to age on an organic base asphalt shingle roof. Causes of Wear or Leaks in Asphalt Shingle Roofs

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This document describes most of the factors which determine the life expectancy of an asphalt shingle roof - "roofing shingle wear factors". These wear factors affect most asphalt roof shingle types, whether organic felt based or fiberglass fabric based, and whether the shingle type is "cutout" or three-tab, strip-type, or a laminate-type roof shingle.

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SHINGLE LIFE / WEAR FACTORS for Asphalt Shingle Roofing Products

Fishmouthed roof shingle fail(C) Daniel FriedmanThis article is part of our series on inspecting, diagnosing, installing and repairing Asphalt Roof Shingles which tells readers how to identify & explain the most-common asphalt roof shingle failures.

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By listing common causes of asphalt roof shingle failures and how to recognize them, building owners and roofing contractors may also be able to reduce the occurrence of asphalt roof shingle storage, handling, and installation errors that affect roof life. Readers are also invited contribute roof failure information to the web author for research purposes.

While the historical cost-performance of this product has been good in most cases, durability issues and wear-out or material failures occur earlier than expected in some situations. The expected life of a roof covering depends on many variables including:

Improperly stored asphalt shingle absorbs water (C) Daniel Friedman

Building factors affecting asphalt shingle roof life:

Cost Effectiveness of Asphalt Shingles:

Other roofing materials also are affected by thermal loading. Cash calculates that the life cycle cost of steep-slope roofing shows that asphalt shingles still provide the most economical performance for the home owner! ("Asphalt Shingle Performance," -- Carl Cash.)

Given these variables, it is not likely that a "20-year" shingle will expire exactly twenty years after it is installed. When a roof lasts longer than its promised life no one complains. If a roof needs replacement substantially sooner than its anticipated life, consumers are understandably concerned.

Asphalt Roof Shingle Wear Factors Research Citations


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ASPHALT SHINGLE LIFE / WEAR FACTORS at - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


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