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Prefinished metal wall panels outside and batt insulation with vinyl scrim facing on the interior.
Exterior panels will be protected with metal liner panels, approximately 2.5 meters high, on the
interior side. Provide a guardrail to protect the liner panel along walls exposed to the exterior.
Surface Treatment. The chemical properties of materials and finishes for exterior surfaces
should have the highest resistance to the effects of weather and salt-corrosive atmosphere.
To prevent mirror like reflections from building surfaces to aircraft in flight, roofs and other
external surfaces should have a specular reflectance compatible with the location of the building
on the airfield.
If the building is so located that glare may be an operational hazard, the critical surfaces of that
building should have a light reflectance of not more than 10, measured at an angle of 85 degrees
in accordance with ASTM D 523, Specular Gloss.
Wall Panels
Field assembled, insulated metal wall panels will typically be the most cost effective. Other
types of panels such as factory foamed panels may be provided as required to comply with the
Base Exterior Architectural Plan and or be compliant with the architectural theme already
established on adjacent facilties.
Roof Systems
The roof system, due to large surface area and proximity to operating aircraft, should be
carefully selected. Insulation should be provided as required to meet the energy budgets
established. On built-up roofs, the design should preclude carrying gravel or slag aggregate from
the roof surface by high winds or drainage to any area where aircraft operate. The color of roof
surfaces should be as described in this section. Provide gutter and outrigger downspouts at the
front of the hangar. Provide snow guards at the front of the hangar in areas subject to heavy
snowfall. Provide access from O2 level spaces to the low roof over the O1 and O2 spaces, and
exterior access to the high roof over the OH space through a secured access panel or hatch, to
prohibit unauthorized passage. . Built-up roofing, insulation, and moisture protection should
conform to the applicable guide specifications listed in MIL-HDBK-1000/1, Engineering and
Design Criteria and Documentation for Navy Facilities.
Consider the use one of the following systems:
1. Metal roof deck with rigid insulation, smooth surface built-up roof system or mineral
surface modified bitumen roof system.
2. Composite metal deck and lightweights concrete engineered roof system with smooth
surface built-up roof system or mineral surface modified bitumen roof system.

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