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 Cast iron drain lines, hints from a home inspectorCast iron drain lines: for many years cast iron drain lines with hubs were used in sewer lines. Hubs were fitted together, then filled with "oakum rope," tamped in tight. Then molten lead was poured around the hub. After it set, which was almost instantly, the lead was tamped, using special tamping tools which look like curved chisels. Not all plumbers today know how to use this system. Pipes must be protected by metal straps to prevent driving nails and screws into them. No-hub cast iron pipe is used today where cast iron is required or desired. In place of the leaded hub is a neoprene sleeve held in place by a stainless steel clamp. This type of pipe is largely used in commercial applications but may be found in single family residences which are "heavily" built and when passing through fire walls. In most cases these pipes will be partially or totally buried and may rust out on the bottom side and leak. The inspector cannot ascertain whether this is the case since the problem is not visible. The inspector will run considerable amounts of water through each fixture in an effort to determine whether the drains are capable, in a reasonable amount of time, of handling the amount of water entering the fixture, and to assure that the fixture drain does not overflow when another fixture is drained simultaneously. The inspector cannot ascertain whether the drain lines will perform properly in the future. Drainage may be blocked at any time by roots, broken pipes and other damages caused by repairmen, objects flushed into the system by homeowners, etc. Fossil fuel water heater or other fuel burning appliance less than 18 to 24 inches above garage floor Water heater stand area damaged stained no overflow pan Water heater vehicle stop (bollard) not installed Hot water circulating pump inoperative noisy Aluminum or flexible gas supply line installed through wall ceiling floor cabinet appliance housing between rigid pipes: to prevent vibration damage , Copper pipe in natural or LPG gas line Gas oil valve line leaks: important note
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