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ORDINANCE NO. NS- 1598 Page Nine (2) SHEAR WALLS (a) Wood stud walls with wood lath and plaster. 50 lbs. per foot each side for seismic shear. (b) Wood stud walls with plaster and lath other than wood lath. 100 lbs. per foot each side for seismic shear. (3) PLAIN CONCRETE FOOTINGS f'A = 1500 psi unless otherwise shown by tests. (4) DOUGLAS FIR WOOD Allowable stress same as No. (1) (d)-(f) (5) REINFORCING STEEL ft = 20,000 lbs per square inch maximum. (6) STRUCTURAL STEEL f. = 20,000 lbs per s~uare inch maximum. FOOTNOTES: (1) The wood lath and plaster must be reattached to existing joists or rafters in a manner approved by the department. (2) Material must be sound and in good condition. (c) STRENGTHENING OF EXISTING MATERIALS. New materials may be utilized to strengthen portions of the existing seismic resisting system in the described configurations provided that the stresses do not exceed the values shown in Table F. TABLE F ALLOWABLE VALUES OF NEW MATERIALS USED IN CONJUNCTION WITH EXISTING CONSTRUCTION NEW MATERIALS ALLOWABLE VALUES (1) Plywood sheathing applied directly over existing straight sheathing with ends of plywood sheets bearing on joists or rafters and edges of plywood located on center of individual sheathing boards. Same as specified in U.B.C. Table 25-J for blocked diaphragm (2) SHEAR WALLS: (a) Plywood sheathing applied directly over existing wood studs. No value shall be given to plywood applied over existing plaster or wood sheathing. Same as specified in U.B.C. Table 25-K for shear walls. (b) Dry wall or plaster applied directly over existing wood studs. Same as specified in U.B.C. Table 47-I. (c) Dry wall or plaster applied to plywood sheathing over existing wood studs. 33 1/3 percent of the values specified in U.B.C. Table 47-I.