UFC 3-600-01
26 September 2006
Insulation installed over concrete floor slabs and completely
covered by wood tongue-and-groove flooring without creating air
spaces within the flooring system.
Insulation completely enclosed in hollow metal doors.
Insulation installed between new exterior siding materials and
existing exterior siding or wood board, plywood, fiberboard, or
gypsum exterior wall sheathing.
Note: The exception to SD limitations described in this paragraph is not
applicable to hospitals and correctional facilities.
2-8
ROOF COVERINGS AND ROOF DECK ASSEMBLIES
2-8.1
Roof Coverings.
Use roof coverings approved and listed by a NRTL. The UL Roofing Materials
and Systems Directory lists three Classes (A, B, and C) of acceptable roof
coverings based on compliance with UL 790, Tests for Fire Resistance of Roof
Covering Materials and NFPA 256, Fire Tests of Roof Coverings. Restrict Class
C roof coverings to housing and buildings under 744 m2 (8,000 ft2) and that are
not mission essential.
2-8.2
Roof Deck Assemblies.
Roof deck assemblies must be FM Class I approved, or UL listed as Fire
Classified or equal listing or classification by an NRTL.
Exception 1: Fully sprinklered buildings.
Exception 2: Buildings less than 744 m2 (8,000 ft2).
2-9
ROOF ACCESS.
All enclosed exit stairs that extend to the top floor in any building three or more
stories in height must have, at the highest point of the stair tower, an approved
hatch opening to the roof with an appropriate ladder that conforms to 29 CFR
1910.27, Fixed Ladders. The hatch must be not less than 1.5 m2 (16 ft2) in area,
with a minimum dimension of 610 mm (2 ft). At least one stairway must
terminate at a standard door opening leading onto the roof surface, unless the
roof has a slope greater than 4 in 12.
2-10
FIRE DEPARTMENT (EMERGENCY) VEHICLE ACCESS.
2-10.1
All-Weather Ground Access.
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