Underslab plumbing / by Scott Newland

As we anticipate the pouring of the basement and garage floor slabs, plumbing is going in.  Once complete, several layers of rigid insulation and a vapor barrier will be added.  Then concrete.

On the lower left is the sewage ejector pump.  The city couldn't verify exactly where the invert was for the street line, and we ended up with a basement floor elevation a little lower than what worked for pure gravity flow.  Hence the pump.  On the right is the sump pump basin.  Exterior and interior drain tile feeds into this, and a vertical PVC vent will extend up through the roof, since the interior drain tile also acts as part of the radon venting system.  In the background is the start of the drain piping for the basement bathroom's shower, toilet and sink.