Hello all,
I am currently building a house myself and have found this site to be useful for plumbing questions I have had. I am capable of plumbing bathrooms, etc., but don't know a lot about "the big picture" ie starting from scratch for plumbing a house. Venting is one of the things that has been confusing me, especially when I begin to read the code.
I have a 4" main drain, roughed in down in the basement. There is a 4" stub that will eventually become the waste stack. The house is two stories. I intend on bringing the 4" up the basement wall, topping it off with a double wye fitting. I would reduce the 3 upper portions of the double wye down to 3". The 2 45 deg portions will have the first floor drains running into them and the middle portion will continue up the wall to have an upstairs bathroom tie into it. Then the stack will continue up to go through the roof.
I can't really see in the code whether or not I can do what I want to do.
I think I'm ok necking down after the first floor because the 4" running up the wall in the basement would be considered the drain, while the 3" that I transition down to would now become the waste stack as it is now providing venting for the fixtures that attach to it within the critical distance. (confirmation here would be great )
If that is correct, what if I take a utility sink and run it into the 4" within the critical distance so that it doesn't need to be vented? Will the 4" drain now become a waste stack above that point and therefore I have a problem necking down at the first floor to a 3" stack?
And finally, let's say I'm reading all of this wrong and I can do the utility sink into the 4" and then neck down to a 3" up above, is there anything that prevents me from necking down to a 2" above my last drain to be able to go through the roof with just a 2"?
I appreciate all the help in advance!
I am currently building a house myself and have found this site to be useful for plumbing questions I have had. I am capable of plumbing bathrooms, etc., but don't know a lot about "the big picture" ie starting from scratch for plumbing a house. Venting is one of the things that has been confusing me, especially when I begin to read the code.
I have a 4" main drain, roughed in down in the basement. There is a 4" stub that will eventually become the waste stack. The house is two stories. I intend on bringing the 4" up the basement wall, topping it off with a double wye fitting. I would reduce the 3 upper portions of the double wye down to 3". The 2 45 deg portions will have the first floor drains running into them and the middle portion will continue up the wall to have an upstairs bathroom tie into it. Then the stack will continue up to go through the roof.
I can't really see in the code whether or not I can do what I want to do.
I think I'm ok necking down after the first floor because the 4" running up the wall in the basement would be considered the drain, while the 3" that I transition down to would now become the waste stack as it is now providing venting for the fixtures that attach to it within the critical distance. (confirmation here would be great )
If that is correct, what if I take a utility sink and run it into the 4" within the critical distance so that it doesn't need to be vented? Will the 4" drain now become a waste stack above that point and therefore I have a problem necking down at the first floor to a 3" stack?
And finally, let's say I'm reading all of this wrong and I can do the utility sink into the 4" and then neck down to a 3" up above, is there anything that prevents me from necking down to a 2" above my last drain to be able to go through the roof with just a 2"?
I appreciate all the help in advance!