3.9 Life Cycle Cost Analysis
for new roofing. The new roofing system should not be of
greater weight than the old, unless a structural analysis
shows that the framing system can carry the additional
weight. Do not overlay new roofing membrane systems
All life cycle cost analysis work focusing on particular
over existing roof membranes. Installing new roofing
items should consider the impact on other related
systems over an existing roof will place additional load on
systems. In other words, it should be a comprehensive
the building structural system and may trap moisture
effort balancing the impacts on all aspects of the building
remaining in the original roof. This trapped moisture can
design.
facilitate the premature deterioration of the building
Methods for performing life cycle cost analysis are
materials.
discussed in Chapter 1: General Requirements, Life Cycle
Costing. This section describes: which architectural and
Uncommon Products Used In Rehabilitations
interior systems require life cycle cost analysis: the
method to be used for analysis: the number of alternatives
In historic preservation it may be necessary to specify
to be considered: and the factors to be considered. These
uncommon materials that may be hard to find. These
requirements vary according to the size and type of
products may be described with the supplier's name and
building. For individual projects, the Scope of Work may
address in the specifications. If more than one supplier
define a different level of analysis than recommended in
exists, multiple manufacturers must be stated. The
the Facilities Standards.
specifications should also contain a note stating: "The use
of a trade name in the specifications is to indicate a
The following systems are to be analyzed depending on
possible source of the product. The same type of product
the size of the facility. For each system, the factors relate
from other sources shall not be excluded provided it
to scale and complexity, and the number of alternatives
possesses like physical characteristics, color and texture."
to be considered.
New equipment should not be installed on existing
Tunnels and Bridges. The analysis should consider the
materials that are very difficult to adapt for proper
costs of the connection versus staff travel time on
connections. These may include: structural glass, marble,
alternative circulation routes. Travel time can be based
and ceramic tile.
on actual contact information between agencies or on
assumptions by the planning team. Other factors that
cannot be calculated but should be considered in making
the selection include climate conditions; security; and
construction challenges. The analysis should be
performed when connections are considered for small
buildings. It is not necessary to perform analysis on any
building with a high security classification or on large
buildings.
104 F A C I L I T I E S S T A N D A R D S
FOR THE
PUBLIC
BUILDINGS
SERVICE
3.9 Life Cycle Cost Analysis
Revised March 2005 PBS-P100
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