I wish building departments had a weekend question
number. I am hoping I can get an answer so I can
complete this work this weekend and get it
inspected next week.
I am relocating one drain line and adding another
drain line from under a raised foundation house
into an attached garage on a slab foundation. The
drain lines are cast iron with no-hub fittings.
The garage slab is about 13 inches below the floor
of the house. The first five inches of this is a
foundation wall, the rest is 5/8 drywall over wood.
The drain through the wall is a 2 inch combo with
a clean out on the strait through and the bend
making the turn up the wall. One drain line is
for a washing machine and the other is for a
The existing drain lines went through a notch in
the slab. I had planned on doing the same until
I remembered reading about the five inches of
concrete being necessary by code to keep spilled
gasoline from flowing into or under the house.
I have no idea where I read this, is this
I can refill the notch around my pipe with
concrete. Is this sufficient?
Will the rubber in no-hub fittings be a problem
with this barrier?
Do I need to wrap the cast iron in pipe tape to
protect it from the concrete?
In the worst case I can put the combo through
the 4 by 6 on top of the foundation (rim joist?)
and then use two 45s to drop below joists and
plumbing. This also has the advantage of
eliminating the heavy tools and work of cutting
the notch in the foundation.
Thanks for any help or suggestions.