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Galvanized sheet metal plastic sewer vent pipes, hints from a home inspector
Galvanized sheet metal plastic vent pipes: these type pipes are found in vent stacks atop fuel burning appliances and in exhaust systems. The pipes, or ducts, come in round shapes of many sizes and in oval shapes of several sizes. They are used to carry gasses and air only. Sheet metal, when used in vent stacks for fossil fuel burning appliances, a type of prefab laundry chute showing the upper floor opening and the lower floor outlet. Must be double-walled (a pipe within a pipe) if they pass through an attic or other enclosed area such as between floors or within a wall. Just above the appliance the sheet metal pipe may be single-wall but must terminate into double wall pipe just before entering the floor, wall, or attic above on its route to the exterior above the building roof. There should always be at least one to two inch clearance between double-wall flue pipe and any combustible material such as wood framing, roof or floor sheathing, etc. And 6 inches of clearance if single wall. When used as an exhaust pipe for venting a room or a range hood there are no clearance limitations. It is very important that each joint in the vent stack be fully inserted into the pipe it attaches to. Failure of a vent stack could allow carbon monoxide into the building or create a fire hazard. Plastic vent pipes are allowed only on certain types of systems and are required on some, such as condensing furnaces and other high efficiency systems. Often plastic vents will pass through and terminate directly outside a wall. This is generally acceptable if the manufacturers specifications so dictate. There are many places where the inspector cannot visually inspect the exact clearances or joint stability of this type pipe. Excessive insulation or the building configuration may prevent a full view of the stack. The word stack, as used in this section, means a system of pipes used to vent a fossil fuel burning appliance.
Gas pipes in ground or concrete without wrapping: gas pipes
Plastic copper pipe in concrete without protective wrap
Pipe meter not supported unprotected damaged
Damaged pipes damaged pipes may include excessively corroded pipes, bent
pipes
Water pressure too low or high
Water flow slows when 2 or more faucets turned on
Flow rate reduced at fixture (possible clogged or damaged aerator or valve)
Water pipes fittings joints corroded leaking
Water pipes not insulated insulation incomplete
The above information was provided by TWI Systems Copyright 1995-2007 1-800-553-5660. TWI is a fantastic company to deal with!
File last updated February 08, 2012 * Copyright © 2012 All rights reserved by: Accurate Inspections, Inc. A New Jersey home inspection firm 56 Woodland Drive, Woodland Park (formerly West Paterson) NJ 07424 973-812-5100 providing New Jersey Certified Home Inspections in NJ, by New Jersey Licensed home inspectors. Inspector of record Michael Del Greco, New Jersey Home Inspector License GI 0121.
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Galvanized sheet metal plastic sewer vent pipes, hints from a New Jersey home inspector who performs home inspections in NJ
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