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ORDINANCE NO. NS-1673 <br />PAGE NINE <br /> <br />FOOTNOTES: <br /> <br /> (1) The wood lath and plaster must be reattached to <br /> <br />existing joists or rafters in a manner approved by the <br />department. <br /> <br /> (2) Material must be sound and in good condition. <br /> <br /> (3) Stresses given may be increased for combinations of <br />loads as specified in Subsection (g) (2) of Section 8-2005. <br /> <br /> (c) STRENGTHENING OF EXISTING MATERIALS. New materials <br />may be utilized to strengthen portions of the existing <br />seismic resisting system in the described configurations <br />provided that the stresses do not exceed the values shown in <br />Table F. <br /> <br /> TABLE F <br />ALLOWABLE VALUES OF NEW MATERIALS USED <br />IN CONJUNCTION WITH EXISTING CONSTRUCTION <br /> <br />NEW MATERIALS <br /> <br />ALLOWABLE VALUES <br /> <br />(1) <br /> <br />Plywood sheathing applied directly <br />over existing straight sheathing <br />with ends of plywood sheets bearing <br />on joists or rafters and edges of <br />plywood located on center of indi- <br />vidual sheathing boards. <br /> <br />Same as specified <br />U.B.C. Table 25-J <br />for blocked diaphragm <br /> <br />(2) SHEAR WALLS: <br /> <br />(a) Plywood sheathing applied dir- <br />ectly over existing wood studs. No <br />value shall be given to plywood ap- <br />plied over existing plaster or wood <br />sheathing. <br /> <br />Same as specified <br />U.B.C. Table 25-K <br />for shear walls <br /> <br />(b) Dry wall or plaster applied dir- <br />ectly over existing wood studs. <br /> <br />Same as specified <br />U.B.C. Table 47-I <br /> <br />(c) Dry wall or plaster applied to <br />plywood sheathing over existing wood <br />studs. <br /> <br />33 1/3 per cent of <br />the values specified <br />in U.B.C. Table 47-I <br /> <br /> <br />