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3.3 LIFE-CYCLE COSTING.  Life-cycle cost is the total cost of
acquiring and owning an asset over its full life time.  For a
facility or property, it includes the costs of acquisition,
development, maintenance, operation, support and, where
applicable, disposal.  The process is no different for a historic
facility than a new facility, except that the life of a historic
facility typically is "forever."  Therefore, the purpose of an
economic analysis for a historic resource is to decide which
material or method will provide the best service "forever."
Details on conducting life-cycle cost analyses can be found in
NAVFAC P-442, Economic Analy sis Handbook.
In a typical economic analysis, the three factors that limit
the economic life of the resource are:
Mission life, or the period over which a need for the
resource is anticipated;
Physical life, or the period over which the resource can
be expected to last physically;
Technological life, or the period before obsolescence
would dictate replacement of the existing asset.
Under the preservation guidelines established for historic
facilities, the mission life of the resource is "forever."  The
technological life of the resource is also a part of the historic
fabric which will be preserved "forever."  Therefore, the
limiting economic factor for evaluating life cycle costs is the
physical life of the resource.  Many traditional, but expensive,
building materials, such as copper, slate, or granite have
unusually long lifetimes that may make them economically feasible
for use in historic buildings which also have indefinite life
One key to successful funding of historic facilities is to
prioritize maintenance areas in terms of their maximum life
benefit to an asset.  Here is a guide:
Exterior skin,
Exterior finish coatings,
High use spaces and surface (especially floors), and
High use/high exposure wall areas.
3.4 BUILDING REGULATIONS.  Building codes are intended to protect
life and property by regulating the design and construction of
buildings.  They are written specifically for new building
projects and modern construction practices.  While local codes do
not apply to military projects, it is Navy policy to provide at
least equivalent protection for occupants of their buildings.
Since most historic buildings were constructed before the
introduction of building codes, they often do not comply with


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