Venting and drainage in an attic bathroom

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So took a picture of the plumbing in my crawlspace and drew a diagram of the plumbing that will affect my project. What do you think?
 

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looks to me like you can cut a wye into that line that is 45ing up

and bring it up to the just below the attitic floor.

it needs to be in the same joist bay where your toilet is going to go
when you start going up vertically, you will not be able to offset horizontally at all
a 3'' pipe is to big to offset, it would destroy the structural integrity

so. pick your spot carefully.

this is what is going to happen

working on a drawing
 
I advise you to go to the experts, too. You could make a mistake in setting up the part and have to redo everything again. In fact, I like doing renovations, especially in the bathroom.
 
I do not use the services of designers because I have enough knowledge to organize a good repair. My husband does the rough work, and I choose the tiles, the shower, the mirror, the interior elements. Of course, we consult and come to a common opinion. I do not like to go shopping and choose all these things, so I usually use a bathroom supermarket online. All the models are well represented on the site, and you can easily choose what you like.
 

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