drain at odd angles

I have a tight space in which I need to install an air admittance valve (AAV). The below image shows the back of the wall behind my bathroom sink that is competing with my nearby tub drain to see who can suck out the other's p-trap faster. From my review of IRC P3114, my options seem very...

I am relocating a second-floor bathroom. The main problem I am dealing with in planning out the remodel is figuring out the drain to the existing stack. I cannot run straight to the stack. I have U-shaped stairs in the space the drain would typically go through to get to the stack. Going around...

Hello, thanks for all the help you have given me as I lurked about in the past. Now I must post, and hope for the best. I have a new construction master bath, in a cellar. original rough was for a double sink vanity. now I am changing to a beautiful reclaimed buffet turned vanity/vessel...

This is my little brain buster. The highlighter line through room 4 and 5 represents the ditch in my slab (former garage) where we are putting in a mother-in-law suite. My original mistake is that I should have offset this ditch to make these angles but now I'm trying to make it work without...