Page 113 - ICC IEBC 2018

APPENDIX A

[BS] TABLE A108.1(2)
STRENGTH VALUES OF NEW MATERIALS USED IN CONJUNCTION WITH EXISTING CONSTRUCTION
NEW MATERIALS OR CONFIGURATION OF MATERIALS STRENGTH VALUES
Plywood sheathing applied directly over existing straight sheathing
Horizontal diaphragms with ends of plywood sheets bearing on joists or rafters and edges 675 lbs. per ft.
of plywood located on center of individual sheathing boards.
Plywood sheathing applied directly over wood studs; no value 1.2 times the value specified in the current
should be given to plywood applied over existing plaster or wood building code.
sheathing.
Crosswalls The value specified in the current building
Drywall or plaster applied directly over wood studs.
code.
50 percent of the value specified in the
Drywall or plaster applied to sheathing over existing wood studs.
current building code.
Anchors extending entirely through unreinforced masonry wall 5,400 lbs. per anchor for three-wythe
Tension anchors f secured with bearing plates on far side of a wall 30 square inches minimum walls.
of area. b, c 2,700 lbs. for two-wythe walls.
Anchors embedded not less than 8 inches into unreinforced masonry The value for plain masonry specified for
1
walls; anchors should be centered in 2 / -inch-diameter holes solid masonry TMS 402; and no value
Shear bolts e, f 2
3
with dry-pack or nonshrink grout around the circumference of the larger than those given for / -inch bolts
4
anchor. should be used.
Through-anchors—anchors meeting the requirements for shear and Tension—same as for tension anchors.
for tension anchors. b, c Shear—same as for shear anchors.
Combined tension and Embedded anchors—anchors extending to the exterior face of the
shear anchors f wall with a 2 / -inch round plate under the head and drilled at an Tension—3,600 lbs. per anchor.
1
2
1
angle of 22 / degrees to the horizontal; installed as specified for Shear—same as for shear anchors.
2
shear anchors. a, b, c
Reinforced masonry infilled openings in existing unreinforced Same as values specified for unreinforced
Infilled walls
masonry walls; provide keys or dowels to match reinforcing. masonry walls.
The value specified in the current building
d
Reinforced masonry Masonry piers and walls reinforced per the current building code.
code for strength design.
Concrete footings, walls and piers reinforced as specified in the The value specified in the current building
d
Reinforced concrete
current building code. code for strength design.
2
For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm , 1 pound = 4.4 N, 1 degree = 0.017 rad, 1 pound per foot = 14.43 N/m, 1 foot = 304.8 mm.
a. Embedded anchors to be tested as specified in Section A107.4.
1
b. Anchors shall be / 2 inch minimum in diameter.
c. Drilling for anchors shall be done with an electric rotary drill; impact tools should not be used for drilling holes or tightening anchors and shear bolt nuts.
d. Load factors or capacity reduction factors shall not be used.
e. Other bolt sizes, values and installation methods may be used, provided that a testing program is conducted in accordance with Section A107.5.3. The
strength value shall be determined by multiplying the calculated allowable value, determined in accordance with Section A107.5.3, by 3.0, and the usable
value shall be limited to not greater than 1.5 times the value given in the table. Bolt spacing shall not exceed 6 feet on center and shall be not less than 12
inches on center.
f. An alternative adhesive anchor bolt system is permitted to be used providing: its properties and installation conform to an ICC Evaluation Service Report; and
the report states that the system’s use is in unreinforced masonry as an acceptable alternative to Sections A107.4 and A113.1 or TMS 402, Section 2.1.4. The
report’s allowable values shall be multiplied by a factor of three to obtain strength values and the strength reduction factor, φ, shall be taken equal to 1.0.

94 2018 INTERNATIONAL EXISTING BUILDING CODE ®
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