Hi,
I am putting in a new bathroom and am wondering if my 3" main drain can handle the extra fixtures
Before the bathroom this is everything that drains to main....
-Toilet
-Lav
-Bathtub/Shower
-kitchen Sink
-Dishwasher
-Washmachine
-Laundry Sink

What I will be adding
-Toilet
-Shower
-Lav

I just hate to put it all in and find out later I should have put in a 4" pipe, it still will be a pain in the a$$ because I have cut studs along the wall to accommodate the 3", but still better to ask this question now before walls are finished.
Thx!

You can add your toilet and lav / shower, as planned. As far as size is concerned 3'' can cary the added fixtures. But check with your local building codes to make sure that this is allowed. Goodluck ---Zeke---