Page 232 - ICC IEBC 2018

RESOURCE A

TABLE 1.2.4
METAL FRAME WALLS
8″ TO LESS THAN 10″ THICK
PERFORMANCE REFERENCE NUMBER REC.
ITEM CODE THICKNESS CONSTRUCTION DETAILS NOTES
LOAD TIME PRE-BMS-92 BMS-92 POST-BMS-92 HOURS
1
On one side of / ″ wood fiberboard sheathing
2
3
3
next to studs, / ″ air space formed with / ″ ×
4
4
5
1 / ″ wood strips placed over the fiberboard
8
and secured to the studs, paper backed wire
3
lath nailed to strips 3 / ″ brick veneer held in
4
3
3
4
1
W-9-Me-1 9 / ″ place by filling a / ″ space between the brick See 1 hr. 1 1 1 /
16 4
and paper backed lath with mortar; Inside fac- Note 2 45 min.
3
ing of / ″ neat gypsum plaster on metal lath
4
5
attached to / ″ plywood strips secured to
16
edges of steel studs; Rated as combustible
because of the sheathing; See Notes 1 and 2;
Plaster exposed.
1
W-9-Me-2 9 / ″ Same as above with brick exposed. See 4 hrs. 1 1 4
16 Note 2
On one side of paper backed wire lath attached
3
to studs and 3 / ″ brick veneer held in place by
4
filling a 1″ space between the brick and lath
with mortar; Inside facing of 1″ paper-
enclosed mineral wool blanket weighing 0.6 See
2
1
W-8-Me-3 8 / ″ lb./ft. attached to studs, metal lath or paper Note 2 4 hrs. 1 1 4
2
backed wire lath laid over the blanket and
3
attached to the studs, / ″ sanded gypsum plas-
4
ter 1:2 for the scratch coat and 1:3 for the
brown coat; See Notes 1 and 2; Plaster face
exposed.
1
W-8-Me-4 8 / ″ Same as above with brick exposed. See 5 hrs. 1 1 5
2 Note 2
For SI: 1 inch = 25.4 mm, 1 pound per square inch = 0.00689 MPa.
Notes:
1. Lightweight steel studs ≥ 3 inches in depth. Stud spacing dependent on loading, but in any case, the spacing is to be such that adequate rigidity is provided to
the metal-lath plaster base.
2. Load is such that stress developed in studs is ≤ 5120 psi calculated from the net area of the stud.
General Note:
The construction details of the wall assemblies are as complete as the source documentation will permit. Data on the method of attachment of facings and the
gauge of steel studs was provided when known. The cross sectional area of the steel stud can be computed, thereby permitting a reasoned estimate of actual
loading conditions. For load-bearing assemblies, the maximum allowable stress for the steel studs has been provided in the table “Notes.” More often, it is the
thermal properties of the facing materials, rather than the specific gauge of the steel, that will determine the degree of fire resistance. This is particularly true for
nonbearing wall assemblies.

2018 INTERNATIONAL EXISTING BUILDING CODE ® 213
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