I'm buildinga barn with the center section 24 foot wide and 2 stories. A 12 foot wide single story lean to will be on each side of the center section. One lean to will contain a bathroom, kitchen, and a washng machine. I'm planning on having a second story bathroom also. Is it advisable to run the 3 inch vent stack for the first floor through the concrete footing of the center section to pick up the second floor bathroom? The 2 inch standpipe for the kitchen sink, which is on an outside wall, will also have to be run through a concrete footing. Is this OK? Does anyone have a DWV layout for a typical bathroom? A kitchen? Thanks in advance for your help.