How To Vent A Floor Sink

The true vent is aligned vertically and attaches to your drain line through the roof.

How to vent a floor sink.

So hack the floor up to you get to a point where you can bring the dry vent pipe a horizontal dry vent pipe below the flood level rim of the fixture up in a wall and eventually connect it to the vent system. Cut notches about an inch wider than the pipe to accommodate a fitting. To have a large sink that drains properly you need to keep in mind some basic plumbing principles. You will need an 1 5 vent if using a 3 drain and a 2 vent if using a 4 drain.

The vent should connect within 4 5 feet of the trap. Slip lengths of 2 inch pipe down through the holes drilled in the floor plate for the tub and sink vents. A drainpipe attached to the p trap goes into an opening in the wall. Putting a sink in an island in the middle of the kitchen presents some plumbing challenges.

If you are installing a floor sink or a mop sink then yes you will need to have a ptrap and a vent installed for the sink. Generally the venting for a sink goes upward in the wall while the drain water flows downward towards the floor but in an island going up is not an option. Have a helper hold the pipes plumb as you mark the plate below for notching. Most mop sinks use a 3 or 4 drain pipe trap.

True vents also have no water running through them.