Help - Advice on Waste line/vent

[tmy23]

Greetings. And thanks in advance for any help. I am converting a small room (8x8) that was a nursery connected to the MBR into a bathroom, with tile shower, toilet and vanity, no tub. This room is directly over our foyer which only has 1 interior wall and that wall has a large doorway in it, so finding walls to run pipe is tough..

So if I can run the waste line/vent in an exterior wall, I can avoid a horizontal 90 in the waste line in the bathroom floor and cutting/sistering about 5 floor joists.

Our primary bathroom (family bathroom) has a waste line/vent in the exterior wall and we've never had a problem.

I don't know that I can fit the 3" waste line in the exterior wall, and I can't box it out because there is a stairway underneath, so if I have to run across the bathroom, turn 90 and then notch/sister a bunch of joists, I assume if I use 2 -45's to make the 90 and maintain pitch I'll be ok??
again...thanks for the advice/

 

[Terry]

That sounds like a bad plan going through that many joists.
At the least, you would need them to be 2 x 10's and leave 2" of wood on top and bottom.
Your other bathroom may not have had to cross any joists.

 

[Sponsor]

 

[tmy23]

That sounds like a bad plan going through that many joists.
At the least, you would need them to be 2 x 10's and leave 2" of wood on top and bottom.
Your other bathroom may not have had to cross any joists.[/QUOTE

 

[tmy23]

Terry, thanks for the timely reply. I'd rather not do that either, a lot more work. So I assume because I haven't had freezing problems with my other bath, I can run the waste line down the inside of the exterior wall.