Bathroom Plumbing
Hot & Cold Sink Supply Lines/ShutoffsThere are small faucet knobs that control and shut off the flow of water for both the hot and cold water for the lavatory(s) as well as a cold supply for the toilet and/or bidet. Usually these faucets will have a ½-inch copper pipe coming in to the shutoff and have 3/8 or 1/4-inch tubing from the shutoff to the lavatory faucet or toilet |
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Plumbing TrapsIn order to prevent sewer gasses and odors from entering the house, plumbing drains were designed long ago with "traps". A trap is a section of the drain piping, usually directly under the drain, that forms an "S". The drain pipe forms a 180-degree curve followed directly by another 180-degree curve. These "S" traps are no longer recommend and are outlawed at some locations. The pipe can also form a "P," (recommended) and the drain pipe forms a 180-degree curve followed by a 90-degree curve. The trap or curves in these pipe are designed to allow the water to drain, but allow residual water to remain behind and act as a barrier to unwanted sewer gasses escaping up the drain pipe and into the home. |
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The point to remember is it's necessary that a drain pipe be designed with a trap installed in order to prevent sewer gasses from entering the house’s breathable airspace.
