Plumbing basement bathroom, need advice

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burme

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Im wanting to finish a basement bathroom myself and wanted to run my plan by you all for advice and insight on anything I may be missing..

The whole house is plumbed with 3/4" pex-b. My plan is to T into the 3/4" lines and run 1/2" pex-b lines for a toilet, sink, shower, and another sink for a wet bar. I will use crimps to connect the lines and adapters. The main lines that run through the bathroom come from the mechanical room on the opposite wall where I have the toilet line and sink outlined. Should the lines coming off the main line be 3/4" up to the fixtures/shut off valves or can they be 1/2" directly off the main line? Is there any issues with my current layout for the additional water lines? Something a may not be considering?

The drains are already installed but need to be stubbed out. The drains run to a sump crock pump in the mech room. There is a vent line attached to the sump pump. I assume I do not need to add additional vents to the already installed drain lines? I do plan to add the stub like vents to the sinks as they are also on the other sinks in the house. Also, the drain lines are 2". How do I stub those out of the wall. I cant find any 2" to 1.5" elbow pieces at the local hardware store.

Lastly, this seems to be the part I'm getting hung up with the most, the drain for the tub. It's about 52.5" from the finished wall. The tub my wife would like to get is a standard 60x30" jet tub with reversable drain the front side of the tub (not in the center). Will there be any limitation to the drain in the floor in regards to the drain placement of the tub (end of tub vs center of tub)?
bathroom.jpg
 

davidgilbert23

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It sounds like you've got a good plan for finishing your basement bathroom. Running 1/2" PEX-B lines for the toilet, sink, shower, and wet bar should work just fine. Typically, you'd run 3/4" PEX lines up to the fixtures, but you can use 1/2" directly off the main line without any major issues, especially since the flow requirements for these fixtures are generally low. Crimping and using adapters is the right way to go when connecting the lines. Just make sure the pressure and flow will be sufficient for everything you're adding.

For the drains, since you already have them installed and they run to a sump crock pump with a vent line, you're probably good on the venting side. Adding stub-out vents to your sinks should be fine, as you're doing it the same way as with the other sinks in your house. As for the 2" drain lines, stubbing them out can be tricky if you can't find the right elbow pieces. You might need to look for fittings online or at a different hardware store, but generally, reducing the 2" pipe to 1.5" is a common practice for sinks, and you should be able to find the right parts eventually.

Regarding the tub drain, the standard jet tub your wife wants might have its drain in a different spot than where your current floor drain is. The placement of the tub drain being at the end rather than the center might require you to move the drain pipe slightly, but since it's a reversible drain, it gives you some flexibility. Just make sure the tub’s drain lines up with the plumbing or check if you can easily adjust the position of the drain to fit. You may need to shift the drain location a bit to match the tub's design.
 
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