. Principles and practice of plumbing . allstacks should be at least 5feet above the roof, and theoutlet protected by a heavybrass wire basket securelyfastened to the opening toprevent articles being drop-ped into the stack. Supports for Stacks.—Soil and waste stacksshould be firmly supportedat their base by a brick pieror iron pipe rest placed di-rectly under the stack. If i-is nthe house drain is suspend- ^°>^ Flashing for cow ciiumtoed from the ceiling beams, a strong iron hanger should beplaced on the drain close to the stack and when possible toplace two hangers, one on each side of th
. Principles and practice of plumbing . allstacks should be at least 5feet above the roof, and theoutlet protected by a heavybrass wire basket securelyfastened to the opening toprevent articles being drop-ped into the stack. Supports for Stacks.—Soil and waste stacksshould be firmly supportedat their base by a brick pieror iron pipe rest placed di-rectly under the stack. If i-is nthe house drain is suspend- ^°>^ Flashing for cow ciiumtoed from the ceiling beams, a strong iron hanger should beplaced on the drain close to the stack and when possible toplace two hangers, one on each side of the stack, it shouldbe done. Besides supporting stacks at their base theyshould also be supported at each floor of the building byheavy iron hangers or clamps securely fastened to the sidewalls or floor beams. Pipe hooks may be used in smallframe buildings, but should not be used in buildings overthree stories in Material for Stacks.—Cast-iron hub-and-spigot pipeis generally used for soil waste and vent stacks in buildings. Digitized by Microsoft® 86 Principles nnd Practice of Plumbing that do not exceed 65 feet in height. In buildings of greaterheight, wrought-pipe drainage systems are generally in-stalled. The recommending features of this system ofpiping are, greater and more uniform strength of the pipe,less number of joints, greater strength and permanence ofthe joints, greater range in the size of pipes and fittingsand greater flexibility of the pipes and of the system as awhole. Wrought-pipe drainage systems differ from otherdrainage systems only in the materials of which they areconstructed and the method of working the materials. Digitized by Microsoft® Principles and Practice of Plumbing 87 CHAPTER IXTRAPS AND TRAPPING Siphon Traps Classification op Traps.—Traps are fittings used toprevent the passage of air or gas through a pipe withoutmaterially affecting the flow of sewage. To successfullyperform the functions for which they are intended, trapsmust
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