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Old 04-06-2019, 09:37 AM   #1
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Bathroom in garage with existing concrete slab


I知 wanting to put a bathroom in the back corner of my garage. A slab is already poured and is 6 inches thick. I知 wondering what you all think would be my best option for the toilet plumbing. The only options I can think of are a wall mount toilet, plumbing on top of slab and install joists over, or cut a hole in the concrete. I would rather cut a hole in the concrete but I知 unsure the best way to go about that. What are your alls opinions on this? Thank you.


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Old 04-06-2019, 10:01 AM   #2
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Re: Bathroom in garage with existing concrete slab


my uncle did this to his garage a few years ago.
he built up the floor for the whole "half bath" - - - - -
you had to step up into the bathroom (maybe 1 or 2 times a day).
the trade off is the step in and out (bad if you been a drinking).
vs the cost of the alternative like you suggested of wall mounted.
(a urinal is not that hard to do - a toilet has more issues.
or - a built up platform just for the toilet - like a composting toilet at the park.
the most cost effective urinal is just a piece of PVC pipe out the wall and
into the ground. (it's a GUY thang).

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Old 04-06-2019, 10:08 AM   #3
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Re: Bathroom in garage with existing concrete slab


Do you have access to the sewer line and at what depth.
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Old 04-06-2019, 10:45 AM   #4
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Re: Bathroom in garage with existing concrete slab


Quote:
Originally Posted by derekeh View Post
A slab is already poured and is 6 inches thick.
I’m wondering what you all think would be my best option...
Best? Hire someone else to do the jack hammer and haul off work.
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Old 04-06-2019, 08:43 PM   #5
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Re: Bathroom in garage with existing concrete slab


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Do you have access to the sewer line and at what depth.


I will have a septic tank installed for the garage. I just need to get the plumbing stubbed out of the garage.


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Old 04-06-2019, 09:12 PM   #6
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Re: Bathroom in garage with existing concrete slab


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Old 04-09-2019, 06:23 PM   #7
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Re: Bathroom in garage with existing concrete slab


https://www.upflushtoilet.com/products/saniflo-saniplus


Get this and pump it
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Old 04-09-2019, 09:04 PM   #8
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Re: Bathroom in garage with existing concrete slab


A dedicated septic system for a garage bathroom. Hmmm


If there already is a septic system for the rest of the house, can you tie in? If not, and you are in an area that cares about such things, have you researched whether you can get a permit for a second system?
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Old 04-09-2019, 10:15 PM   #9
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Re: Bathroom in garage with existing concrete slab


There is not right or wrong here. Like johny said, making a bath over the slab is easier but you have to step into it. That will be my choice anyway. Cutting the slab is not funny, lots of dust and there is also iron in there, you have to dig more in one end for the levels, then pour some concrete on top again.
With the first option the only "problem" i see is to hide the pipe on the outside because is to high, but a plant will do the job. And if you want to get rid of the bath some time ahead is easy to do.

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Old 04-09-2019, 10:54 PM   #10
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Re: Bathroom in garage with existing concrete slab


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Originally Posted by Rafacacho View Post
There is not right or wrong here. Like johny said, making a bath over the slab is easier but you have to step into it. That will be my choice anyway. Cutting the slab is not funny, lots of dust and there is also iron in there, you have to dig more in one end for the levels, then pour some concrete on top again.
With the first option the only "problem" i see is to hide the pipe on the outside because is to high, but a plant will do the job. And if you want to get rid of the bath some time ahead is easy to do.

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Are you going to run the sewer pipe out of the building above ground?
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Old 04-11-2019, 01:45 AM   #11
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Re: Bathroom in garage with existing concrete slab


Don't know where you live - however, they do sell toilets that flush out the back horizontally... see the picture.

So - that could allow you to run the line into another part of the house where the floor can be penetrated easily.

Or, weather/local permitting, bring the line outside and then trench to where you want to connect to the sewer (encapsulate the pipe sticking out of the back of wall by building a tool shed or something small to hold garden hose, etc.

Just a thought..

And as others have suggested, simply build a platform and raise the floor.
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