Shop Bathroom ?

[Augus7us]

So I was talked into putting a toilet and sink in my shop, while adding walls and insulating it.

Pops tells me that I have to have 1/8" drop for every foot to the septic tank and its about 80' so roughly a 10" drop. Shouldn't be a problem there but he commented that I need some drop under the toilet and that was concerning him. He thought that the 10" drop plus the drop under the toilet might be to much drop together.

My question for you guys is how much drop do I need under the toilet? I looked under my basement where my bedroom toilet is and it looks like its just a 90 connected to a flange or something up top and then running to my septic line below. The shop toilet will sit on my concrete pad that is ~4".

Thanks!

 

[Copymutt]

Never had any issue w/ an elbow just under the slabs. I believe 1/4” per ft. Is code.
Don’t forget a vent stack.

 

[firebirdparts]

Yeah, I would have said 1/4"

I don't understand the comment of "too much drop". I have a bathroom on the second floor of my house. Doesn't everybody? Everything is either vertical or 1/4" a foot.

 

[Copymutt]

If you’ve got the room, you and your wife will appreciate a shower in the garage.

 

[sberry]

Better than that a urinal along with a sink and stool. I like sink in bathroom and another utility sink out on the shop floor. Urinal keeps the stool for what its made for and less of a mess and the utility is the deal to wash up easy and fast. I always wash if I need to before walking out the door, don't need to dirty any other bathroom common hand washing. Coffee klutch and small fridge too.

 

[BarryWells]

Sink. ******* / 3x3 shower, Good to go

 

[dagofast]

Below is a link to a picture of the rough in plumbing under my garage floor. Shower, (closest) toilet & sink. The only P trap is for the shower. A toilet should drop straight to an elbow. The actual P trap in a toilet will be built in to the porcelain base. A sink will have a P trap installed under the drain.

And ¼" per foot is the minimum acceptable drop in most places. Check your local codes.

https://i.imgur.com/QetMd42.jpg

 

[Citation]

Yeah, I would have said 1/4"

I don't understand the comment of "too much drop". I have a bathroom on the second floor of my house. Doesn't everybody? Everything is either vertical or 1/4" a foot.

My understanding is you either want vertical where everything goes down or a slope in some range. The objective of the slope is to get #1 and #2 to flow together. This avoids a risk of a poop dam (not a damn poop)
https://www.doityourself.com/stry/drain-pipe-slope-calculation

 

[tarmy]

I put in the toilet and sink...also added a shop sink as well. I should have added the shower...I recommend doing all of them...

 

[coljar]

Never had any issue w/ an elbow just under the slabs. I believe 1/4” per ft. Is code.
Don’t forget a vent stack.

^^^
All of this including the 1/4". If I remember right, the elbow is just under the slab in my shop bathroom and it has worked fine.

 

[climb.on]

I had a very tight elevation difference between my shop and the tank. We were going 120' or so. We kept the elbow as close to the bottom of the slab as possible. Since we were so high in the soil with that line, I laid 2" of insulation over the pipe. We also needed a cleanout every 50' I think. So I have 2.

Love, love having a toilet in the shop. Do it!

 

[Augus7us]

Yeah, I would have said 1/4"

I don't understand the comment of "too much drop". I have a bathroom on the second floor of my house. Doesn't everybody? Everything is either vertical or 1/4" a foot.

Well ****, no pun intended

firebird, its the depth of my septic hookup, if the drop is too much I'll be below the hookup to the septic.

Seems pops may have been confused, he hasn't built any houses in a few decades. So at 1/4" its going to be a 20" drop and that may be cutting it close. I haven't had a transit or anything to determine what my max falloff is. I need to redig that section of my trench and borrow my buddies laser transit.

I did have to compromise due to space and headaches I was willing to take on and omit the small shower. Its a sacrifice I'm milling to live with. Thanks guys!

 

[Augus7us]

Follow up question; does the hookup to the toilet require a 3" or 4" pipe? Also whatever size it is I'll need to punch that through my pad. Would you use a diamond holesaw or just use a big hammer drill and chisel out a hole?

 

[Jeepster04]

Feel like I start a lot of posts like this... Im certainly no expert and dont want to be one... But Ive yet to hear to anyone that Ive physically spoke up say theyve ever had an issue with too much slope.

Recently helped hook my parents up to city sewer. Their line comes out of their house, runs ~20', then takes a 45 over a hill into another 45 and after ~10' goes into the grinder. No issues to date.

A friend hooked up to city sewer and ran a 300' line that dropped ~15' vertically.. No issues to date.

 

[AKCJ]

Wrap something like foam around the pipe where it pokes up through the slab. That way you won’t have to chisel out the concrete when you go to install the toilet flange. Don’t ask me how I know.

 

[Innovate1]

Wrap something like foam around the pipe where it pokes up through the slab. That way you won’t have to chisel out the concrete when you go to install the toilet flange. Don’t ask me how I know.

They make toilet flanges that slip inside the main pipe to avoid that issue.

 

[sberry]

I put in the toilet and sink...also added a shop sink as well. I should have added the shower...I recommend doing all of them...

I like this, simple, no guess as to where the sink is. No doors or other handles to deal with to wash up before going in to the bathroom.

 

[sberry]

This is on the far side, I have another sink near the entrance sort of in the traffic pass thru. Some of these pics are older, there has been some renovation with pieces of furniture.
Some was ruff prototype that worked, when it became a distraction for me I found newer pieces or tailored things to move the work flow along.
In winter I don't use the side door and apron but during good weather I open a coupole doors and it becomes a raceway around my office and a couple sets of shelves mostly dedicated to the here and now of the work in that vicinity. Even drive thru with golf carts.

 

[sberry]

The perspective in the first pic above is a bit skewed. It is in about the middle of the bay on thjer far side, its a little walk to take a p sometimes but the sheet in front of it is about 75% and unless you walk up to it don't grasp whats around, no doors, mostly blocked from 85% and semi dark, don't even notice it being used.
I turn the heater on in the ,middle of the winter if we are doing a rebuilding job in the tractor bay. Today the water in the off heater is rather moderate from the hot on the faucet. The stool and sink is in a utility room off my office. On day to day not used a lot by guests but available and I have a shower in upstairs appt along with stool and vanity.

 

[Monza Harry]

With regards to the slope, I remember that 1/4"/Ft. as the standard, but at the time the low flow toilets came along I was told the standard changed to 1/8"/Ft. This was also residential not industrial which would be closer to the use of your barn/shop/garage, your house will run lots of water down the drain to clear the "debris" that may have stuck around [Automatic washing machine, dishwasher, bath/Jacuzzi tubs, incessant sink use by the family etc.] The high slope sections can possibly cause a problem but 2 years ago the city put new sewers down my street and my ~1/4"/Ft. sewer runs to the property line and the on a ~45(?)* angle to the sewer on the street, 17' down so the cities own guide lines are only for us not them(?) the pipe could have continued and went straight down but it looked like most were done like mine went. Perhaps some here will have more info on the change in slope deal and know if the lower water usage of a garage would affect the slope or not. Harry

 

[sberry]

It works with 3 inch on residential with 1/8 a foot.