Vulcraft Steel Roof and Floor Deck Catalog - University of Maryland ...

SDI
Specifications
and Commentary
Recommended Maximum Spans for Construction and
Maintenance Loads Standard for 1 1 /2 Inch and 3 Inch Roof
Max. Recommended Spans
Span Span Roof Deck Cantilever
Type Condition Ft.-In. Meters Ft.-In. Meters
Narrow NR22 1 3'-10" 1.15 m
Rib Deck NR22 2 or more 4'-9" 1.45 m
NR20 1 4'-10" 1.45 m
NR20 2 or more 5'-11" 1.80 m
NR18 1 5'-11" 1.80 m
NR18 2 or more 6'-11" 2.10m
Intermediate IR22 1 4'-6" 1.35 m
Rib Deck IR22 2 or more 5'-6" 1.65 m
lR20 1 5'-3" 1.60 m
IR20 2 or more 6'-3" 1.90 m
Wide Rib WR22 1 5'-6" 1.65 m
Deck WR22 2 or more 6'-6" 1.75 m
WR20 1 6'-3" 1.90 m
WR20 2 or more 7'-5" 2.25 m
WR18 1 7'-6" 2.30 m
WR18 2 or more 8'-10" 2.70m
Deep Rib 3DR22 1 11'-0" 3.35 m
Deck 3DR22 2 or more 13'-0" 3.95 m
3DR20 1 12'-6" 3.80 m
3DR20 2 or more 14'-8" 4.45 m
3DR18 1 15'-0" 4.55 m
3DR18 2 or more 17'-8" 5.40 m
Construction and maintenance loads:
SPANS are governed by a maximum
stress of 26 ksi (180 MPa) and a maximum
deflection of L/240 with a
200 pound (0.89 kN) concentrated
load at midspan on a I'-0" (300 mm)
wide section of deck. If the designer
contemplates loads of greater magnitude,
spans shall be decreased or the
thickness of the steel deck increased
as required.
All loads shall be distributed by
appropriate means to prevent damage
to the completed assembly during
construction.
1'-0"
1'-2"
1'-7"
.30 m
.35 m
.45 m
1'-2" .35m
1'-5" .40m
1'-11"
2'-4"
.55 m
.70 m
2'-10" .85m
3'-5"
3'-11"
4'-9
1.05 m
1.20 m
1.45 m
Cantilever loads:
Construction phase load of 10 psf
(0.48 kPa) on adjacent span and cantilever,
plus 200 pound load (0.89 kN)
at end of cantilever with a stress limit
of 26 ksi (180 MPa).
Service load of 45 psf (2.15 kPa)
on adjacent span and cantilever, plus
100 pound load (0.44 kN) at end of
cantilever with a stress limit of 20 ksi
(140 MPa).
Deflection limited to L/240 of adjacent
span for interior span and deflection
at end of cantilever to L/240 of
overhang.
Notes:
1. Adjacent span: Limited to those
spans shown in Section 3.4 of Roof
Deck Specifications. In those
instances where the adjacent span is
less than 3 times the cantilever span,
the individual manufacturer should
be consulted for the appropriate
cantilever span.
2. Sidelaps must be attached at end
of cantilever and at a maximum of 12
inches (300 mm) on center from end.
3. No permanent suspended loads are
to be supported by the steel deck.
4. The deck must be completely
attached to the supports and at the
sidelaps before any load is applied to
the cantilever.
4. Installation & Site Storage
4.1 Site Storage: Steel deck shall
be stored off the ground with one
end elevated to provide drainage,
and shall be protected from the
elements with a waterproof
covering, ventilated to avoid
condensation.
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