I'm turning a home office room into a laundry room and 1/2 bathroom. I want to install a toilet with a 3 " waste line, tie a 2" waste line from the sink into the 3" waste line, and also tie the 2" waste line from the washing machine into the 3" toilet waste line. I would then run the 3" new toilet waste line about 20 feet or so where it would tie into an existing 3" toilet waste line that has venting through the main toilet stack and through the roof of my house. I cannot access any existing roof plumbing vents where this new bathroom is being installed. Can I rely/use the existing toilet stack venting for these new fixtures, or do the new fixtures need their own, new venting? If I had to install new venting, it would go through the outside wall then go vertical with a new, exposed ABS vent pipe up over the side edge of the roof and look rather ugly.
My house is near Tacoma, Washington, and was built in 1935. The existing office is on the main floor adjacent to an outside wall. I have access to install all of the waste pipe via the basement, but I cannot get to any existing plumbing vents due to their location near the center of the house and behind many walls. The ceiling of the office room is the floor of a bedroom above it, so I cannot access that space either.
I would prefer not to use an air admittance valve(s) for the reasons others on this forum have previously mentioned. So, my options are to rely on the existing vents on the main waste stack, or to install the ugly new vent pipe to the outside of the house. Any thoughts? Thanks for your help!
Here's a crude diagram of what I propose:
My house is near Tacoma, Washington, and was built in 1935. The existing office is on the main floor adjacent to an outside wall. I have access to install all of the waste pipe via the basement, but I cannot get to any existing plumbing vents due to their location near the center of the house and behind many walls. The ceiling of the office room is the floor of a bedroom above it, so I cannot access that space either.
I would prefer not to use an air admittance valve(s) for the reasons others on this forum have previously mentioned. So, my options are to rely on the existing vents on the main waste stack, or to install the ugly new vent pipe to the outside of the house. Any thoughts? Thanks for your help!
Here's a crude diagram of what I propose: