Specifications (37) FIRE- RESISTANCE -RATED CONSTRUCTION
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TABLE 720.1(2)
RATED FIRE - RESISTANCE PERIODS FOR VARIOUS WALLS AND PARTITIONS a' °'P
MINIMUM FINISHED
THICKNESS FACE -TO -FACE°
ITEM - `� J (Inches)
MATERIAL NUMBER CONSTRUCTION ( hour, our 2 hour 1 hour
1 - 1.1 Solid brick of clay or shale 6 4.9 3.8 2.7
1 -1.2 Hollow brick, not filled. 5.0 4.3 3.4 2.3
1 -1.3 Hollow brick unit wall, grout or filled with perlite vermiculite or expanded shale 6.6 5.5 4.4 3.0
1. Brick of clay or aggregate.
shale 4" nominal thick units at least 75 percent solid backed with a hat - shaped metal
furring channel 3/4" thick formed from 0.021" sheet metal attached to the brick
1 -2.1 wall on 24" centers with approved fasteners, and 1 / 2 " Type X gypsum wallboard - - 5 -
attached to the metal furring strips with 1" -long Type S screws spaced 8" on
center.
2. Combination of 2 -1.1 4" solid brick and 4" tile (at least 40 percent solid). - 8 - -
clay brick and
load - bearing 2 -1.2 4" solid brick and 8" tile (at least 40 percent solid). 12 - - -
hollow clay tile
3 l.lf g Expanded slag or pumice. 4.7 4.0 3.2 2.1
3. Concrete 3- 1.2f•g Expanded clay, shale or slate. 5.1 4.4 3.6 2.6 -
masonry units 3 -1.3f Limestone, cinders or air - cooled slag. 5.9 5.0 4.0 2.7
3- 1.4 Calcareous or siliceous gravel. 6.2 5.3 4.2 2.8
q • Siliceous aggregate concrete. 7.0 6.2 5.0 3.5 _
94
Carbonate aggregate concrete. 6.6 5.7 4.6 3.2
4. Solid concrete°•' 4-1.1
i KC.I Sand - lightweight concrete. 5.4 4.6 3.8 2.7
Cor� • Lightweight concrete. 5.1 4.4 3.6 2.5
One 2" unit cored 15 percent maximum and one 4" unit cored 25 percent
et-) 5 -1.1 maximum with 3 /4' mortar - filled collar joint. Unit positions reversed in alternate - 63/8 - -
courses.
One 2" unit cored 15 percent maximum and one 4" unit cored 40 percent
5-1.2 maximum with 3 / 4 "mortar - filled collar joint. Unit positions side with 3 / 4 " gypsum - 63/ - -
plaster. Two wythes tied together every fourth course with No. 22 gage corrugated 4
metal ties.
5. Glazed or 5 -1.3 One unit with three cells in wall thickness, cored 29 percent maximum. - - 6 -
unglazed facing -
tile, One 2" unit cored 22 percent maximum and one 4" unit cored 41 percent
nonload - bearing 5 -1.4 maximum with' /4 "mortar -filled collar joint. Two wythes tied together every third - - 6 -
course with 0.030" (No. 22 galvanized sheet steel gage) corrugated metal ties.
I 5 -1.5 One 4" unit cored 25 percent maximum with 3 /4" gypsum plaster on one side. - - 4 -
5 -1.6 One 4" unit with two cells in wall thickness, cored 22 percent maximum. - - - 4
5 1.7 One 4" unit cored 30 percent maximum with 3 /4' vermiculite gypsum plaster on - - 4 -
one side.
5 -1.8 One 4" unit cored 39 percent maximum with 3 / 4 " gypsum plaster on one side. - - - 4
(continued)
2003 INTERNATIONAL BUILDING CODE® 115