19 - Asphalt Shingles and Wood Shingles
Commonly called composition shingles, this material has a typical life expectancy of 12 to 25 years, depending on many factors. The number of
roofs installed over existing shingles is limited to three and in some jurisdictions only two are allowed.
Wood Shake and Shingles:
Wood roofs will typically last 20 to 35 years
depending upon the thickness and quality. Annual maintenance is required on wood roofs which consists of replacing the weather-damaged shakes. In
some areas the constant moisture can cause the wood to deteriorate. Care against fire is advised.
20 - Clay and Concrete
Tile, Slate, Metal and Fibrous
Clay and Concrete Tile:
These materials are very durable and have anticipated life
of 30 to 50 years. The tiles, however, are brittle and can be damaged, so the roof cannot be walked on. The inspection is very limited.
Slate: Considered one of the longest lasting roofing materials, slate can endure 50 to more than 100 years. A very brittle and expensive roof,
inspections are limited.
Metal and Fibrous:
Metal roofing comes in many forms from shingles to panels. Fibrous roofing is a mixture of various materials including cement and perlite.
21 - Built-Up Roofing, Single Ply and Foam
Built-Up Roofing: The surface covering is the distinguishing feature of this roof cover. Maintenance consisting of repairing any worn areas is required. Installed on low slopes, these roofs should be inspected annually due to the potential for poor drainage.
Single-Ply: A relatively new roofing system, single-ply membranes are gaining in popularity. The roof covering consists of large sheets of a rubber or PVC-based compound.
Foam: Polyurethane foam with elastomeric coating. This roof requires periodic re-coating to extend its service life.
22 - Exposed Flashing
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