Do I need a vent here?

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JSLayton

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The tub will connect to the main line past the vent connection. Does it need a separate connection to vent? The white lines show where the proposed drain will be. The toilet connection is the end of the main line.
 

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Jadnashua

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I think you'll find you must vent the tub. The vent must be within a certain distance of the trap whose length varies based on the ID of the drain pipe you're using - you can go further the bigger the pipe before a vent...otherwise, the trap can get siphoned dry.
 

Terry

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The tub will need it's own vent in this case. Within 42" of the p-trap.
The tub waste is 2" after the vent. The trap arm can be 1.5"
 

hj

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quote; I thought this forum was to help people with plumbing questions? This comment doesn't seem very helpful.

We are here to help people with DIY plumbing questions, such as how to fix a faucet, NOT to tell people how to install DWV systems which should have a building permit and inspection, which usually requires a licensed contractor. Sometimes the best advice IS to tell you to call a plumber. After all there is more to plumbing than just having a box of fittings, some pipe, and a level.
 

Tom Sawyer

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Very true HJ although in truth I belong to about a dozen forums, it was late, I was tired and thought I was replying to someone on another forum that doesn't allow anyone other than licensed plumbers too post, so apologies to the OP and do what Terry said to do.
 
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