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Why should you tear off old roofing?
Learn about Roofing......
Asphalt shingles are the most commonly used and among the least expensive of materials available for steep slope applications. They are very durable and are available in a wide variety of colors and textures.
Asphalt shingles consist of either an organic (wood fiber or cellulose) or fiberglass mat which has been saturated with asphalt and covered with colored mineral granules. In climates where fungus growth is a potential problem, granules treated with algaecide are available. "Self-sealing" shingles have an additional strip of adhesive on the underside. The adhesive is activated by the sun's heat after installation and "seals" each shingle to the one below it, providing extra wind uplift resistance for the roof system.
The cost of roofing material is not the main ingredient in roofing cost. Labor and possibly disposal of old roofing material are significant costs. Out of concern for future roof life, some roofers are reluctant to install new roofing atop failed material even where additional layers of roofing are permitted by local codes.
Some homeowners are reluctant to install as new roofing the same product which failed early in the first place. Manufacturers might have changed the formulation of the product to improve durability, but they are understandably reluctant to say so, out of concern for increasing product liability. Without assurance from the manufacturer that a product which failed early has been modified to correct the problem, we advise our clients to consider using alternative products with design and performance expectations having a better track record.