Page 201 - 2018_Complete_14_Collection (1)_Neat

FIRE AND SMOKE PROTECTION FEATURES

TABLE 721.1(3)—continued
MINIMUM PROTECTION FOR FLOOR AND ROOF SYSTEMS a, q
THICKNESS OF FLOOR MINIMUM THICKNESS OF
OR ROOF SLAB CEILING
FLOOR OR ROOF ITEM CEILING CONSTRUCTION (inches) (inches)
CONSTRUCTION NUMBER
4 3 2 1 4 3 2 1
hours hours hours hour hours hours hours hour
12. 1 / " deep steel
1
2
roof deck on steel-
framing insulation
of rigid board con-
sisting of expanded
perlite and fibers
impregnated with
integral asphalt
waterproofing; den-
sity 9 to 12 pcf Gypsum-vermiculite plaster on metal lath wire tied at 6"
secured to metal intervals to / " furring channels spaced 12" on center and
3
1
4
roof deck by / " 12-1.1 wire tied to 2" runner channels spaced 32" on center. — — 1 — — — 7 / 8 —
2
wide ribbons of Runners wire tied to bottom chord of steel joists.
waterproof, cold-
process liquid adhe-
sive spaced 6"
apart. Steel joist or
light steel construc-
tion with metal roof
deck, insulation,
and Class A or B
built-up roof cover-
ing. e
Gypsum plaster over / " Type X gypsum lath. Lath
3
8
initially applied with not less than four 1 / " by No. 13 gage
1
8
19
by / " head plasterboard blued nails per bearing.
64
Continuous stripping over lath along all joist lines.
Stripping consists of 3" wide strips of metal lath attached
1
1
by 1 / " by No. 11 gage by / " head roofing nails spaced 6"
2
2
13-1.1 on center. Alternate stripping consists of 3" wide 0.049" — — — — — — — 7 / 8
diameter wire stripping weighing 1 pound per square yard
3
1
and attached by No.16 gage by 1 / " by / " crown width
2
4
staples, spaced 4" on center. Where alternate stripping is
used, the lath nailing shall consist of two nails at each end
13. Double wood and one nail at each intermediate bearing. Plaster mixed
floor over wood 1:2 by weight, gypsum-to-sand aggregate.
joists spaced 16" on
center. m, n Cement or gypsum plaster on metal lath. Lath fastened
1
7
with 1 / " by No. 11 gage by / " head barbed shank
2
16
13-1.2 roofing nails spaced 5" on center. Plaster mixed 1:2 for — — — — — — — 5 / 8
scratch coat and 1:3 for brown coat, by weight, cement to
sand aggregate.
Perlite or vermiculite gypsum plaster on metal lath secured
7
1
13-1.3 to joists with 1 / " by No. 11 gage by / " head barbed — — — — — — — 5 / 8
2
16
shank roofing nails spaced 5" on center.
c
1 / " Type X gypsum wallboard nailed to joists with 5d
2
13-1.4 cooler or wallboard nails at 6" on center. End joints of — — — — — — — 1 / 2
o
o
wallboard centered on joists.
(continued)
174 2018 INTERNATIONAL BUILDING CODE ®
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