Ask Your Question

Angie's List Answers is the trusted spot to ask home improvement and health questions and get answers from service companies, health providers and consumers. For ratings and reviews on companies in your area, search Angie's List.

Top 30 Days Experts
Rank Leader Points*
1 kstreett 240
2 Guest_9020487 110
3 Guest_9190926 105
4 GoldenKid 100
5 ahowell 95
6 KnowledgeBase 95
7 skbloom 80
8 Guest_98024861 70
9 Guest_9311297 70
10 Guest_9400529 70

*Updates every 4 hours

Browse Projects By Category

Question DetailsAsked on 5/25/2011

Slow draining mud sink

We had a contractor move our washing machine from the garage to a new location in the house. The washing machine worked fine in the garage and it still works fine in the house. We also had the contractor put in a mud sink in the garage where the washing machine was located. The mud sink drains extremely slow and acts like it is plugged up. I have put the usual drain cleaners in the mud sink, but it still acts plugged up. The mud sink plumbing looks OK. Any ideas?

Do you have the same question? Follow this Question

1 Answer


I realize this is a late comment, but in case your issue did not get solved, or for others who might access this question:

I would give about 10:1 odds that line is not hooked into the vent stack. When running the washer, first off the top of the pipe was open to the air so that acted as a vent stack, and the inlet was probably about 4-5 feet above the sewer under the slab so that induced flow, plus washing machines put a good velocity flow out so it tends to want to go down fast by itself.

When you put a mud sink there, several things happened - you put in a trap, so if not hooked to the vent stack it is now pulling a suction on the trap, which makes it flow slowly. Also, the trap under the sink is a lot lower than the washing machine discharge was, so less hydraulic head on the flow between there and the sewer pipe, which is probably just under the slab. I would also bet the plumber used the existing drain pipe, probably 1-1/2 inch, from the washing machine - mud sinks typically are plumbed 2 inch or larger by code - commonly 2-1/2 or 3 inch pipe if considered a laundry tub, assuming they will have high flows at times and a lot of debris to wash down, and assuming in many cases that washing machine will be discharging into the mud sink. This is particularly important on slab level drains where there is only a couple of feet elevation difference between the trap and the sewer pipe.

Solution - not easy probably because sewer pipes are likely in the walls, but would be to connect properly to vent stack if possible, and secondly to run larger pipe from it to the sewer. Third thing that could help but major hassle, if drain pipe goes horizontally into wall, is plumb directly down to connet to the sewer under the slab, but this is more hassle and cost than a mud sinkk probbly justifies.

Answered 6 years ago by LCD

Related Questions

Terms Of Use
Privacy Policy