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Are running traps legal by plumbing code?
Sunday, March 13, 2022
"Running trap” is a common name for what the building codes refer to as a building trap. It dates back to the time before individual traps were required for each plumbing fixture, and building traps have been prohibited by the plumbing codes for many years. A building trap could also be called a “whole house P-trap” because it is on the main drain line, usually in the crawl space under a house or buried in the ground just outside the home, and provides a single seal to protect the entire home. For more details, go to our articles What is a building trap? and What plumbing traps are illegal by code?
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Here’s links to some of our other articles about PLUMBING DRAINS AND TRAPS:
• Why can't a sanitary tee be used for a horizontal-to-horizontal drain pipe connection?
• Why is it a problem when a trap under a sink is installed backwards?
• What are the code requirements for plumbing vent terminations?
• What are the code requirements for layout of drain piping under sinks?
• What causes a gurgling sound when a bathtub or sink drains?
• What is the difference between a vent stack and a stack vent?
• What is a "combination waste and vent" in a plumbing system?
• Why is garbage disposal not allowed at a combination waste and vent (CW&V) under a sink?
• What is an indirect waste receptor?
• What is the difference between water pipe and sewage (waste) pipe?
• How can I tell if a house is connected to a septic tank system or sewer?
• What is an auto vent, air admittance valve, or check vent?
• Can I make a trap under the sink from straight pipe and 90º elbows?
• Why is there a flexible accordion pipe under the sink?
• How do I get rid of the sewer gas smell in my house?
• What are the pipes on my roof?
• What is a "cross connection" in a home's plumbing system?
• What is an "S-Trap" under my sink? Why is it a problem?
• Is a sink required to have a drain stopper?
• Can a laundry sink drain be installed without a trap under it?
• What is a drum trap at a plumbing drain?
• Can a dishwasher drain hose be connected after the sink trap (to the trap arm)?
Visit our PLUMBING DRAINS AND TRAPS page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.
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