Civil Engineering Reference
In-Depth Information
struction materials and methods used in the United States. Other data
are available from various professional organizations and some com-
mercial firms (Whitehead, Means, etc.), but almost all of these data are
“anecdotal” in origin, not based on any real scientific study.
Table 2-1 is a “master” list of building components typically found
in commercial and institutional facilities.
Thislistisnotall-inclusiveand,
overtime,shouldbemodiiedbyeachuserbasedonexperiencewithotherma-
terials,equipment,andsystems
. The components are listed in accordance
with ASTM Standard E1557, Uniformat II, which defines a standard
classification for building components and related site work. Table 2-1
provides reference economic or service life values based on evaluation
of the data from numerous sources (especially the HAPM) and these
values are based on the building and its components being maintained
to at least a “stewardship” level.
Some conditions that can reduce the reference service life have
been identified and are listed in Table 2-1 as “service life issues,” as fol-
lows:
2.1 Reduce to 10 years if treated wood is not used for exposed or damp
locations, including mud sills, wall bottom plates on concrete
slabs, the first row of exterior sheathing, etc.
2.2 Acrylic caulking is average (8-12 years). Butyl and bitumen rubber
caulks have a life of 5 years. Polysulphide and polyurethane have
an expected life of 15-20 years. Backer rods should be replaced
with recaulking. Subtract 5 years for second and subsequent caulk-
ing applications.
2.3 Reduce to 5 years for dark colors facing south or southwest.
2.4 Reduce life by 50% if slope exceeds 3/12.
2.5 Storms and hurricanes can damage roof coverings enough to sig-
nificantly shorten their life. Subtract 2 years for each year with
above average storm activity.
3.1 Subtract 3 years for use in corridors or other high traffic areas. Sub-
tract 5 years if within 20 feet of exterior door.
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