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- Asphalt Shingles/Wood Shingles
Asphalt
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 / 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 Flashings
Metal
or vinyl flashing used with the roofing material to help make the
roof weather tight. Common uses are: drip edge, chimney flashing,
vent pipes, wall and skylights.
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