placement of such building systems as mechanical, electrical and
communications distribution systems, unique structural considerations and
utility piping systems. Elements requiring special ceiling heights should
be grouped on the least number of floors consistent with proper functional
design. See Appendix A and Section 19, Integrated Building Systems.
Underfloor or Crawl Spaces. Limit crawl spaces or underfloor
areas to less than 2130mm (7 feet) in height. Reference Section 2, Design
Procedures, Submittals and Documentation, Figure 2-5.
Exterior Wall Design.
Materials and Assemblies. Select materials that are durable,
require low maintenance and are compatible with applicable criteria
including Military Handbook 1008.
Joint Locations. Evaluate the design characteristics of walls
as they relate to construction and control joint locations, considering
impact on sterile areas, construction sequence, and building movement due
to expansion and contraction.
Climate Factors. Climate data establishes performance
requirements for thermal design of exterior walls. Use overall composite
heat transfer or "U" factors in conjunction with local climatological
data. Composite "U" factors must conform to criteria in Section 7, Energy
and Water Conscious Design, and Section 8, Heating, Ventilation and Air
Thermal Resistance. Obtain the thermal characteristics of
single materials or wall assemblies from the American Society of Heating,
Refrigeration and Air-conditioning Engineers (ASHRAE) Handbook of
Fundamentals (reference 4c) or from manufacturer's certified technical
information. Identify thermal resistance (R) values for each element in
the building shell. Prepare "U" factor calculations following recommended
procedures as documented in the ASHRAE Handbook of Fundamentals (reference
4c). Use thermal transmission values prescribed in Section 7, Energy and
Water Conscious Design, Table 7-1.
Fenestration and Windows.
General. Design fenestration in accordance with National Fire
Protection Association (NFPA) codes, HVAC requirements, and installation
or command aesthetic appearance criteria. MIL-HDBK-1190 (reference 4d)
contains provisions for natural light and ventilation and prescribes
minimum glass areas to achieve those provisions in certain facilities, but
establishes maximums only for locations designed for less than 18 C (0
F) winter design temperature. Design must provide for window cleaning and
Required Locations. Exterior windows must be provided in
normal nursing care, Intensive Care and Cardiac Care bedrooms,
Prosthodontic Dental Treatment Rooms (non-tinted), and Prosthodontic-
Ceramics Laboratories (non-tinted). Natural lighting may be provided in
Dermatology Clinics, if required by the using Military Department.