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Old 11-30-2017, 06:51 AM   #1
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Outdoor building drain line


Hi all,

I am in the planning stages of adding a separate small building in my back yard that will be on a slab. I would like to avoid trenching to the main sewer drain at the front of my house. My plan is to run slightly uphill from under the new slab to the crawl space under my house to attach to the existing drain under my bathroom. I plan to install a basin drain system with an ejector pump to do this.

Right now I am searching for opinions in doing it this way or suggestions on any other ideas.

Thanks,

Randy
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Old 11-30-2017, 09:11 AM   #2
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Re: Outdoor building drain line


Stuff doesn't flow uphill so that would be your only option.
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Old 11-30-2017, 11:10 AM   #3
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Re: Outdoor building drain line


What fixtures will you have in the outbuilding. Sewage ejector systems are expensive and require maintenance. I just paid $2500 to replace the pump plus $180 to pump the tank (sump) out.
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Old 11-30-2017, 06:22 PM   #4
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Re: Outdoor building drain line


If you are in an area subject to freezing, you need to consider any part of your plan that doesn't completely drain. Ejector pumps usually install with a backwash valve, which you may not want. Also, consider the distance from shed to house against the recommended pump distance for your ejector - I imagine the pump will come with some kind of lift and run recommendations.
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Old 11-30-2017, 06:39 PM   #5
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Re: Outdoor building drain line


Slope the pipe downhill to under the house and put the pump there. I wonder if an under sink pump could pump the distance.
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Old 12-01-2017, 05:06 AM   #6
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Re: Outdoor building drain line


My plan is to install a toilet, sink and shower. sloping the line downhill to under my house is a good idea. The problem is that I only have a 18" crawl space which would make digging difficult. I do not live in an area subject to freezing so I'm not worried about that. Home Depot sells a basin /pump system for about $300. I'm thinking that I had better be careful buying that one as a previous poster mentioned that just their replacement pump cost $2500.

Thanks for the suggestions and comments. It is very much appreciated.
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Old 12-01-2017, 07:56 AM   #7
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Re: Outdoor building drain line


In my area code requires the connection from an auxiliary building to be outside, downstream of the house when possible.
Simply not wanting to dig a ditch is not a valid reason here. I suggest you check with your authorities.
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Old 12-01-2017, 11:37 AM   #8
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Re: Outdoor building drain line


I agree with you. Right now I am looking at options. The more that I think about it the more I think that I will go with a trench and tying into the sewer system. My feeling is that I'm either going to do it right or not at all. I always do things myself. However, I am not above hiring a professional if the job is too big for me or if I do not have enough knowledge. I have a friend that is a journeyman plumber that I have not talked to yet.
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Old 12-01-2017, 06:37 PM   #9
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Re: Outdoor building drain line


Contact your local sewer authority. Most likely they will limit your options.
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