Page 228 - ICC IEBC 2018

RESOURCE A

TABLE 1.2.1—continued
METAL FRAME WALLS
0″ TO LESS THAN 4″ THICK
PERFORMANCE REFERENCE NUMBER REC.
ITEM CODE THICKNESS CONSTRUCTION DETAILS NOTES
LOAD TIME PRE-BMS-92 BMS-92 POST-BMS-92 HOURS
Core: steel studs; see Note 4; Facings: both
1 hr.
3
7
1
W-3-Me-35 3 / ″ sides / ″ thickness of 1:2; 1:2 gypsum plas- N/A 15 min. 1 1 / 4
4
8
ter.
7
Core: steel; see Note 4; Facings: / ″ thick-
8
3
W-3-Me-36 3 / ″ ness of 1:2; 1:3 gypsum plaster on both N/A 1 hr. 1 1
4
sides.
For SI: 1 inch = 25.4 mm.
Notes:
1. Failure mode—local temperature rise—back face.
2. Three-fourths inch or 1 inch channel framing—hot-rolled or strip-steel channels.
3. Reinforcement is 4-inch square mesh of No. 6 wire welded at intersections (no channels).
4. Ratings are for any usual type of nonload-bearing metal framing providing 2 inches (or more) air space.
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 ® 209
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