[mrwilkinson]

Here is the scenario. I am roughing in a new bathroom and adjacent laundry room. The bathroom layout is as follows left to right: lavatory, water closet, bath tub. All side by side with minimum required separation distances. I am installing a stack vent in the wall directly behind water closet. The easist way to rough in is to stack vent all three. The problem (or the first problem) is that the toilet is not 18" from the stack vent, so I can not attach the toilet and bath tub together on a double sanitary tee.

Does anyone see a problem with stacking single sanitary tees on the vent stack to attached the toilet and bath tub?

Second issue. The newly installed laundry/washing machine is approx 6 feet from the vent stack. I can not find the code, but believe this horizontal distance is too short for a washing machine. If I connect the drain from the washing machine to the vent stack is this going to be an issue? The other option is to run the washing machine drain over approx 4 additional feet and connect directly into the main 4" house horizontal drain. If I go this route, I will need to drop the washing machine drain approx 2 vertical feet (vertical distance between the washing machine horizontal drain and the main house drain. If I change direction do I need to revent the washing machine drain? Or can I just increase the pipe size change in direction.

Thanks!

[speedball1]

Does anyone see a problem with stacking single sanitary tees on the vent stack to attached the toilet and bath tub?

I do! You may not discharge a major fixture, such as a toilet, past a unvented minor one, such as your bathtub. A typical bathroom installation goes down like this. The lavatory to connect to the toilet drain line and vent to the roof or revent back in the attic to a existing roof vent. The tub to connect to the lavatory drain line and be wet vented by it as will the toilet. Be advised to always check local codes before changing or remodeling your drainage system.

Second issue. The newly installed laundry/washing machine is approx 6 feet from the vent stack. I can not find the code, but believe this horizontal distance is too long for a washing machine.

For a 2" drain the distance is 5 feet from trap to vent. Most inspectors will let you fudge a bit if it's close. Good luck and thank you for rating my answer. Tom

[Milo Dolezal]

Post sketch of your layout so we can better see what you want to do.

[mrwilkinson]

Thanks for the replies. I will place the toilet lower on the vent stack than the bathtub, or loop vent the bathtub. To expand further on the washing machine issue. The washing machine is loop vented so venting is not the issue. The problem that I see is attaching the washing machine into the vent stack so close to the other fixtures (6 feet away). It seems that a better idea is to connect the washing machine drain into the main horizontal waste line.

The two questions:
1. Is 6 feet to close between the washing machine and other fixtures (toilet, lavoratory, bath tub).
2. If I run the washing machine drain line by itself over to the main house horizontal drain line, I will have to install a 90 degree bend in the washing machine drain line dropping the discharge approx 2 feet. If I go this route do I need to revent the washing machine drain at the 90 degree bend?

Thanks

[speedball1]

1. Is 6 feet to close between the washing machine and other fixtures (toilet, lavoratory, bath tub).

If you have a partial clog I can see it backing up into the lowest point which is your bathtub.

2. If I run the washing machine drain line by itself over to the main house horizontal drain line, I will have to install a 90 degree bend in the washing machine drain line dropping the discharge approx 2 feet. If I go this route do I need to revent the washing machine drain at the 90 degree bend?

No you won't have to vent the bend if the washer's already vented. What end of the run will the bend be on? We use 45's to drop a drain line instead of a 90. Please give me more details about the proposed drain. Regards, Tom