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<br />360 <br />1-1/4 <br /> <br />and one foot below the official grade. Water leaders <br /> <br />connected to such background drainage pipe which are <br /> <br />on the outside of the building wall that abuts on a <br />public thoroughfare, shall be constructed of galvanized <br /> <br />wrought iron pipe, galvanized steel pipe, or cast iron <br /> <br />pipe for a distance of not less than five feet verti- <br /> <br />cally above the official grade. All drain lines in pub- <br />lic street area shall be approved by the City Engineer. <br /> <br />II · Section 1406 <br /> <br />No sheet metal water leader shall <br /> <br />be installed on the inside of a building, inner court <br /> <br />or vent shaft, nor shall any sheet metal leader be <br /> <br />directly connected to any drainage system which connects <br /> <br />with a public sewer. <br /> <br />II · Section 1407 <br /> <br />When an existing sheet metal <br /> <br />water leader pipe within the walls of any building <br /> <br />becomes defective, such water leader shall be replaced v <br />with one which conforms to the provisions of this <br /> <br />chapter. <br /> <br />" 'Section 1408 <br /> <br />All underground roof and area <br /> <br />rainwater drainage piping within the walls of a building <br />shall be cast iron pipe and fittings, and all such <br /> <br />piping above ground shall be cast iron pipe and fittings, <br /> <br />galvanized wrought iron pipe with approved drainage <br /> <br />fittings, galvanized steel pipe with approved drainage <br /> <br />fittin~s, or copper DWV pipe with approved drainage <br />fittings. <br /> <br />II'TABLE l4-l <br /> <br />SURFACE AREA (SQUARE FEET) <br />SIZE OF PIPE (INCHES) <br /> <br />500 1000 <br />1-1/4 y- <br /> <br />1500 <br />2-1/2 <br /> <br />2460 5220 9430 <br />r-~s- <br /> <br />15030 <br />6 <br /> <br />31490 <br />8 <br /> <br />55150 <br />10 <br /> <br />-22- <br />