shattering or spalling. Nonnailable concrete slabs shall be either
cellular or aggregate concrete, flat or channel in shape.
2.1.2
Structural Cement-Fiber Roof Decking
Structural cement-fiber roof decking shall be shaped under pressure to
required dimensions from a mixture of wood fibers and cementitious
materials in proportions to produce deck units meeting the loading
conditions specified. Exterior surfaces shall be suitable for applying
roof. Metal edge members, if furnished with units, shall be galvanized.
Flame spread shall not exceed 25 and smoke developed rating shall not
exceed 50 when tested in accordance with ASTM E 84. Linear variation with
change in moisture content, both linear and transverse, shall not be more
than 0.2 percent when tested in accordance with ASTM D 1037.
2.2
STRUCTURAL STEEL SUBPURLINS
Steel for structural subpurlin members, if required, shall conform to [the
manufacturer's standard] [_____].
2.3
ANCHORAGE
Fasteners shall be of steel, zinc-coated or equivalent protective metallic
coatings.
2.4
JOINT MATERIAL
Joint material shall be high-melting-point asphaltic mastic, grout, mortar,
or lightweight concrete. Joints at hips and ridges may be filled with wood
blocking, single thickness, structural grade, pressure-preservative treated.
PART 3
EXECUTION
3.1
INSTALLATION
Installation shall be in accordance with the approved detail drawings.
Installation of equipment required by other trades shall be accomplished as
the work progresses if required by the design. Field-cut openings for
utilities penetrations shall be accomplished in accordance with the
manufacturer's recommendations. Roof deck shall be straight and true, and
when laid in place must present a flat, level surface suitable for
application of roofing. All roof decking units shall bear on at least two
structural framing members with a 25 mm 1 inch minimum bearing. Any
cantilever plank shall not exceed the design span. Installation shall
require a minimum of cutting. Cutting, where required, shall be at a true
angle to the top of the unit. All units shall be made to fit around
openings and projections, valleys, walls, and curbs, so that cut ends occur
on supports and in a manner that will not damage the units. When roof deck
units are welded to steel supports, welds and damaged galvanized coatings
shall be cleaned and coated with zinc-rich paint. No attachment for
carrying loads shall be made directly to the roof decking or subpurlins.
3.1.1
Subpurlins
Subpurlins shall be aligned to the required spacing and shall bear evenly
inch. Subpurlin ends shall have at least 3 mm 1/8 inch clearance to allow
for expansion. Subpurlins shall be welded to each structural framing
member at every point of crossing, over supporting member with a 20 mm 3/4
SECTION 03414A
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