Venting question

[Barry Mounce]

I am building a small cabin and have a plumbing venting question. My tub, toilet, vanity sink, and washing machine sit next to each other along a wall in that order. I hope to use a common 3 or 4 inch drain that they will all hook to starting with the tub and working down the list. This pipe will be running under the cabin so they all will have p traps before they hook in. I was hoping to put in a single vent into the drain line just before the tub and have it run up the wall and out the cabin. Will this work? The vent can be 2 to 3 inches (I was thinking 2 1/2 since I already have that pipe). So the order of connection the to main drain would be; vent pipe, tub a few inches past it, toilet about 30 inches past it, vanity another 30 inches, and the washer another 30 inches past the vanity. Any and all advice would be appreciated

 

[frodo]

nope, nope nope

the reason I say this is suds relief. if you do what you describe,every time you use the washing maching suds are going to bubble up in the other fixtures.

 

[Barry Mounce]

Wow Thanks! It took me a while to understand your drawing but I see how your way is far better. I do have 2 other questions. 1. Item number 6 is a 3 inch 90 - could that be a 3inch 90 with a washout cap on the other end? That would all me access in case of clogs. 2. Can the 2 vents (lav and washer) just run separately not tying together? I have very little space in attic and it would be easier to just have 2 vents. I realize 1 vent is usually preferred to minimize roof openings.

 

[frodo]

yes you can use a combination and cleanout
and yes you can run 2 vents instead of one
where are you at in LA? I am just across the river over by vidalia/natchez

 

[frodo]

measurements

 

[Barry Mounce]

Thanks! I’m in BR but the cabin/camp is in Greensburg LA close to MS line.