We are trying to install a bathroom sink. They had a step up to go into he small area where they apparently had a sink. They had replaced this tiny bathroom for a closet, but we are trying to place a sink again. The drain pipe is 21 inches high. Can we still mount a sink without having drainage problems? What do we have to do? Vilma and Joe
Install a sink with a drain pipe that’s 21″ off the floor
installationsink
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Based on the above discussion and my own experience:
Turn the water off and twist hard. New ball valves can be sticky, and the house water pressure behind the valve could be making that situation worse.
Apparently this worked for the original poster.
When you purchase a P-trap from the hardware store, you'll end up with these pieces (or something similar).
You'll also want to pick up a 1-1/2 in. PVC 90° slip-joint elbow while you're there.
You'll then want to connect the pieces something like this...
You'll then have to twist the pieces around, until you can get them to fit together. You'll end up with something similar to this.
Though I'm not sure this is code compliant anymore.
In the 2003 version of International Residential Code (IRC), there was this section.
International Residential Code 2003
Chapter 31 Vents
Section P3105 Fixture Vents
P3105.3 Vertical leg for waste fixture drains. A vertical leg (see Figure P3105.3) is permitted within a fixture drain of a waste fixture in accordance with the following criteria:
- Minimum trap diameter shall be in accordance with Table P3201.7.
- The diameter of Section A shall be equal to the diameter of the trap.
- The length of Section A shall not be less than 8 inches (203 mm) and in accordance with Table P3105.1.
- The diameter of Section B shall be one pipe size larger than the diameter of Section A.
- The length of Section B shall not be more than 36 inches (914 mm).
- The diameter of Section C shall be one pipe size larger than the diameter of Section B.
- The total length of Section A and Section C shall not exceed the distance allowed in Table P3105.1.
- Bends shall be the diameter of the largest connected section.
However, in the 2006 version, this section is gone.
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Best Answer
If I'm understanding correctly, your drain pipe is coming out of the wall 21" from the ground?
That's fine, provided you can connect it to the sink properly.
Vanity height is anywhere from 29" to 36". The old "standard height" was 32", however often new construction uses kitchen height or "comfort height" at 36".
A typical bathroom sink basin is from 5 to 9" deep.
A side view of the drain connection looks like this:
So if you have a 32" high vanity, with a 7" deep sink (outside dimension), that gives you about 4" for the tail piece connections, which is somewhat tight but should be enough room.
If you go to a 36" high vanity, you can do a deeper sink.
This doesn't directly answer your question about having drainage problems, however. What I'd be concerned about there is venting. For 1 1/2" pipe, there must be a vent within 3.5' of the trap:
I'm not sure what the status of your project is (eg, if you have access inside the walls to verify the plumbing), but it's easier to validate and fix this problem if necessary before you install a cabinet, sink, tile, paint, etc.