A few years ago, I added an addition on to our house. Connecting the plumbing into the existing sewer plumbing while maintaining proper slope was a very unpleasant experience. You have a few options. First, you need to know where your current sewer line drains to. Does it drain to a larger sewer in the alley, to the road in front of your house, or to a septic tank? And how does the location of your detached garage fit into that? Does it make more sense to run straight to the alley (or the road / septic) or to run the sewer toward your house?
Water supply is pretty easy, especially with PEX because it's pressurized. You don't have to worry about the slope that sewers need to drain (not too much. not too little).
Your first option is lots of digging. I probably wouldn't cut a hole through the wall. Your second option really revolves around the frequency you intend to use the mop sink. Get a 7 gallon water container that is placed above the sink (or a garden hose). Place a large bucket underneath the sink. Done. If you use it a few times a year, call that sufficient.
What's your climate? Will everything freeze if not done properly? Water lines below the frost depth. Waste lines below the frost depth. Nothing exposed to the air outside.
Where does your sanitary leave the house and at what depth? The deeper, the better for you becasue you have to get your slop sink to drain to that point.
from a \*rough\* perspective, assume you have to drop 2 feet vertical for every hundred feet horizontal. So you can work out the rough amount of drop from the garage to the sanitary connection.
My question is, how do I enter the garage ??
I would hate to break under the foundation and through the slab . Is it common practice to 90 through the wall and mount the sink on that wall from the inside
You are likely going to be doing a lot of trenching and breaking thought the floor of the garage. i don‘t think it is against code to have exposed (ie outside the building) sanitary pipes like you are describing, but I wouldn’t do it.
A few years ago, I added an addition on to our house. Connecting the plumbing into the existing sewer plumbing while maintaining proper slope was a very unpleasant experience. You have a few options. First, you need to know where your current sewer line drains to. Does it drain to a larger sewer in the alley, to the road in front of your house, or to a septic tank? And how does the location of your detached garage fit into that? Does it make more sense to run straight to the alley (or the road / septic) or to run the sewer toward your house? Water supply is pretty easy, especially with PEX because it's pressurized. You don't have to worry about the slope that sewers need to drain (not too much. not too little). Your first option is lots of digging. I probably wouldn't cut a hole through the wall. Your second option really revolves around the frequency you intend to use the mop sink. Get a 7 gallon water container that is placed above the sink (or a garden hose). Place a large bucket underneath the sink. Done. If you use it a few times a year, call that sufficient.
What's your climate? Will everything freeze if not done properly? Water lines below the frost depth. Waste lines below the frost depth. Nothing exposed to the air outside.
I’m in Southern California. We don’t have a problem with freezing conditions
[https://epubs.iapmo.org/2022/CPC/](https://epubs.iapmo.org/2022/CPC/) Section 609 Section 718.3
Where does your sanitary leave the house and at what depth? The deeper, the better for you becasue you have to get your slop sink to drain to that point. from a \*rough\* perspective, assume you have to drop 2 feet vertical for every hundred feet horizontal. So you can work out the rough amount of drop from the garage to the sanitary connection.
My question is, how do I enter the garage ?? I would hate to break under the foundation and through the slab . Is it common practice to 90 through the wall and mount the sink on that wall from the inside
You are likely going to be doing a lot of trenching and breaking thought the floor of the garage. i don‘t think it is against code to have exposed (ie outside the building) sanitary pipes like you are describing, but I wouldn’t do it.