Drain Plumbing (click images for a larger version)
Here is the top of the vent stack. It exits out through
the roof.
We asked the man who did the metal roof (and the chimney)
to do the penetration through the roof.
Here is where the vent pipe runs (nearly) horizontal. You want
about 1/4" drop per foot to make sure water doesn't pool in the pipe.
On the left, the pipe turns upward to the roof exit.
On the left side of the photo is the main drain stack. The
stack is 3" PVC which extends down through the floor to the
(future) main drain pipe. It heads up through the roof as the
main vent.
The long, small pipe extending on the left is the drain for the
bathroom lavatory and the small opening on the right is where
the kitchen sink will drain.
The white disc on the floor is the toilet flange.
The toilet elbow (the large ell), drains into the stack on the left.
The P-trap on the right is the shower drain.
I've got the drain sealed with duct tape and a plastic bag for right
now.