Uh oh - trapped goop - the oft-told tale of accordion plastic drain lines.
In this "Newly Remodeled Kitchen," or so the MLS and "Special Features" list stated, there was a very old disposal, which was rusted and stuck, and a drain that was very slow.
The drain was VERY slow.
A drain should always be made of approved, smooth material so what it is flushing moves freely.
Whether the fixture is a toilet, tub/shower, or sink, you want whatever is being drained to move freely!
And the codes concerning drains, and drain material, all say the same thing - "smooth" material.
P3201.1 Design of traps.
Traps shall be of standard design, shall have smooth uniform internal waterways, shall be self-cleaning and shall not have interior partitions except where integral with the fixture.
That is the actual code verbiage.
The codes even specify what rating agencies test and approve the materials, with such acronym names as ASME and ANSI. Any approved plumbing fixtures you would buy at the store would be stamped as conforming with such rating approvals.
Can you explain to me why, therefore, I see this all the time? The accordion plastic traps and drains!
And, since it that drain material is not code approved, why do they even sell it in the stores?
I know why. Because homeowners and other plumbing non-professionals buy it! They buy it and use it because when things get changed and moved and plumbing doesn't align the way it used to, they have to fudge it!
And what better way to fudge it and make it align then with a movable, plastic drain! Solid PVC material is hard to bend and align.
It's difficult to see in the photos above, but this trap was actually made with two accordion-style drains, coupled together at the bottom. See where the code above states there should be no "interior partitions?" This coupling would be an interior partition.
And this drain was slow! And could be clogged anywhere.
The dishwasher drain tubing was done wrong too, but that is another tale for another post!
My recommendation: wrong is wrong. And, as in this case, the market may accommodate wrong. So long as people buy and use this sort of thing it will be sold. So, when you see it, know it is an improper, and amateur, installation. And get it done right.
Jay Markanich Real Estate Inspections, LLC
Based in Bristow, serving all of Northern Virginia.
Office (703) 330-6388 Cell (703) 585-7560