I did fail to mention the use of air chambers in metal plumbing to prevent noise. It helps to see the plumbing in respect to the walls and floor joists so we know how it should look. This shows how things look after rough in. The illustration below shows a typical bathroom plumbed with galvanized pipe. Take the time to make sure everything is properly vented. If a vent is full of water or has restricted airflow, an imbalance in atmospheric pressure can suck the water out of traps and also prevent wastewater from draining. Trial and error has taken us down learning lane once again. It's a simple, but correct example of venting.Ī few decades ago, venting wasn’t a major consideration and there was a lot of leniency in the area of wet venting. ![]() The shaded pipes shows how to solve the problem. This could cause a problem with draining, so it should be remedied. The bath/shower in number 8, and the lavatory in number 11 are mild cases of wet venting because the wastewater and the venting airflow are sharing the same pipe for about 5 or 6 feet. The drawing below has an example of wet venting so you can better understand what this means. This is where a vent pipe running horizontally carries water for a distance greater than normal. Many locations don’t allow, “wet venting”. There are a few rules about vent-plumbing however. You can assemble the parts anyway you want. Put in vent elbow and run line back down to 2-inch T wastewater fitting. Can be either 2-inch or 1 ½ inches for venting.Ģ4. Install 2-inch waste T for access to sink and vent.Ģ3. Put 22-½ degree elbow for wastewater to flow smoothly into Y.Ģ1. Install the 2-inch Y with cleanout back into the stack for sink wastewater.Ģ0. Main waste stack continues up through the roof for proper vent-plumbing.ġ9. Put final 3-inch reducing T into main waste stack. Put in trap for sink, bath, or washer.ġ7. Reducer will be for sink, bath, or washer.ġ6. ![]() Put in closet bend for 2nd floor toilet.ġ5. Install PVC wastewater pipe and bath/shower trap on 2nd floor.ġ4. Continue vent- plumbing stack to the 2nd floor where you will install 3-inch waste T with reducer.ġ3. Install 3-inch reducing T into main waste stack for lavatory trap access.ġ2. Put in 3-inch closet bend for the toilet install.ġ0. Install 2-inch trap for shower/bath or sink.ĩ. Install waste T with side inlet for closet bend and sink wastewater.Ĩ. Put 3-inch reducing Y into main stack with 2-inch reducer for sink or washer.ħ. Install 2-inch sink trap usually with slip fittings to hook up to sink drain.Ħ. Install a 2-inch T for sink wastewater and vent can be 1 ½ inch to vent line.ĥ. Put in 2-inch PVC with 2-inch Y with cleanout. Install 3-inch reducing Y into main waste stack for 1st floor wastewater fixtures.ģ. From mainline, install Y with cleanout and plug, go up with 3-inch PVC pipe.Ģ.
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