We are done with the installation of the new sewer lines, which spread across the basement like a spiderweb. I documented the new lines to have a reference of what is where. This may become handy sometime in the future.
On the street side of the basement, we have the connection to the existing 6 inch sewer, which is followed by a clean out. After the clean out we have a reducing wye that splits the line into the 4 inch sanitary sewer and the 4 inch storm sewer.
The two 4 inch lines extend about 1/3 into the basement, where they turn by 45 degrees to cross between two spread footings on to the west side of the basement.
Shortly after that turn, the storm line turns again by 45 degrees to continue all the way toward the back. At this point the sanitary line splits. One arm is following the storm sewer, while the other arm is continuing further to the west foundation wall.
Close to the wall it turns by another 45 degrees, leading to the main drain stack that will serve all plumbing on the 1st and 2nd floors.
The parallel storm and sanitary lines continue toward the back of the basement, toward the downspout and check valve respectively.
A wye in the sanitary line connects to the check valve. All basement plumbing is connected to that check valve, which is our basement flood protection. The lines crossing above the storm and sanitary sewer are part of the basement plumbing. More on that below.
The sanitary sewer splits again at the end of the regular basement, leading to a drain stack that we put in place to serve a future half bathroom. Because we eventually would like to install a composting toilet, we may never need this stack. It’s more about code compliance in case we need to sell the house at one point.
Both lines, sanitary and storm, terminate in the old grease trap in the back porch. The sanitary line is closed off with an end cap. We may need to install a floor drain in the porch area sometime in the future. If so, we can connect that floor drain to the sanitary line. The storm sewer stub won’t remain like this. I will need to connect it to the existing clay tile that is connected to the roof downspout.
It is relatively easy to follow the main lines. The basement plumbing on the other hand appears somewhat complicated. To document and understand the layout and routing, I need to switch to a bird’s-eye view. The plumbing serves the basement bathroom, kitchen, laundry room and utility room. The problem is that there are not walls – yet – just the rough in plumbing.
Check it out and see if you can decipher the spaghetti bowl!