19 - 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
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
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
Foam: Polyurethane foam with
elastomeric coating. This roof requires periodic re-coating to
extend its service life.
22 - Exposed Flashings
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