I am in the process of building a work shop. The shop will have a slab floor and 8″ tall stem wall. There will be a sink against the exterior wall and I need help figuring out how to do the drain. If the drain is in the wall It will need to be in the stem wall which is a 6″ thick wall. If I put a 2″ pipe down the wall there will not be a lot of concrete left in that spot.
The other option is to put the drain in front of the wall which would mean that I need to modify the cabinet to accommodate the drain.
What is the correct way to do this?
Replies
How cold does it get where you live?
It gets cold here. I think the design temp is 7 deg.
Going through the floor seems easier.
Yeah, I don't think you want to put the pipe in the stemwall. It won't hurt the wall, particularly, but the pipe will be exposed to freezing, and you'd have trouble properly positioning the pipe and avoiding displacing it in the pour.
Encasing the pipe in concrete should be avoided, if possible. Expansion and contraction of the pipe, especially plastic pipe, can lead to joints pulling apart. Of course, it you sleeve the pipe with enought clearance to allow for movement, that would help, but then it will take even more space within the concrete.
It would be better to come up thru the floor of the cabinet, and for the vent, to then offset back into the framed wall to extend the vent thru the roof. Bear in mind that the offset for the vent can't be horizontal below the countertop height--it can be run at a 45-degree angle, however. Your local code may also allow you to install an air admittance valve (mechanical vent device, like Studor brand) instead of going up thru the roof.