electronic equipment when selecting floor construction. Install an
equipotential plane conforming to MIL-HDBK-419, Volume 1, Grounding, Bonding,
and Shielding for Electronic Equipment and Facilities Applications, in the
floor of electronic facility spaces. The preferred method of placing cables
and wiring is given in the BESEP for the facility.
Access Flooring. Provide access flooring to meet the requirements
of NFPA 75, Protection of Electronic Computer/Data Processing Equipment,
Military Specification MIL-F-29046, General Specifications for Raised
Flooring, and MIL-HDBK-1008. Provide a bolted grid (stringer) or a rigid grid
system. Provide seamless vinyl or laminated plastic finishes. Keep air
supply panels and similar inserts flush with the flooring surface. Specify
installation procedures to conform with MIL-HDBK-419, Volumes 1 and 2.
Provide depressed structural framing and slabs in areas where access flooring
occurs to result in uniform, continuous finish floor levels between adjacent
floor spaces. Provide a raised floor installation above a level permanent
floor when it is not economical or practical to depress the structural framing
and slab. Refer to NAVFAC guide specification NFGS-10270, Access Flooring.
Roofing. Provide roof system and insulation to meet the
requirements of MIL-HDBK-1001/5, Roofing and Waterproofing. Determine thermal
resistance of roof insulation by design criteria and life cycle costs. Refer
(ASHRAE), Handbook Fundamentals, NAVFAC P-442, Economic Analysis Handbook, and
TM 5-802-1, Life Cycle Cost Analysis Handbook.
Thermal Insulation and Vapor Retarders. Locate vapor retarders with
care in view of the thermal differentials associated with buildings. Do not
use vinyl wall covering and impervious paint in the interior surface of
exterior walls in humid areas (as defined in MIL-HDBK-1190) unless
calculations show that condensation will not occur in the wall. Special
purpose rooms such as computer rooms normally require stringent air
conditioning requirements. Provide adequate insulation and vapor transmission
barriers to minimize the loads on the mechanical system. Properly insulate
ceiling decks of spaces below supercooled computer rooms and perimeter walls
Exterior Walls. Construct exterior walls of concrete (cast-in-place
or precast), brick, concrete masonry units, or other system appropriate to the
structural system and the function of the building. If concrete masonry units
are used for exposed exterior surfaces, provide coatings on exterior masonry
surfaces to prevent moisture penetration above and below grade. Provide
insulation in exterior walls to meet the criteria for types and thermal
properties in accordance with the appropriate section of MIL-HDBK-1001/2.
Refer to NFGS-04200, Unit Masonry and NFGS-03300, Cast-in-Place Concrete.