I have a late 1800's home that has 1 bathroom on the first floor , I want to add a second bathrrom on the first floor on the other side of the house and a 3rd bathroom just above it on the 2nd floor. Can I add a secondary soil vent for that area and do I need to tie that secondary vent into the old main vent ?
Thank you
Jon

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Originally Posted by Jatoba2650

I have a late 1800's home that has 1 bathroom on the first floor , I want to add a second bathrrom on the first floor on the other side of the house and a 3rd bathroom just above it on the 2nd floor. Can I add a secondary soil vent for that area and do I need to tie that secondary vent into the old main vent ?
Thank you
Jon

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Hey Jon,

You will have to run another vent up for the two baths. This will be a single vent that stands by itself. You don't have to tie it back to the old main vent.
You will also need to vent the lower bathroom group with its own vent. This vent can run up and revent back to the new vent at least 6 inches over t6he flood rim of the upper lavatory and the new vent can continue up iinto the attic and revent back into a existing roof vent.
Most bathroom groups are roughed in like this.
Toilet connects to sewer main or the stack vent. Lavatory connects to toilet drain and runs a vent off the top the stubout tee out the roof or revents back into a dry vent in the attic.. The toilet wet vents through the lavatory vent and the tub/shower connects to the lavatory drain and is wet vented by it. This is a normal rough in and is acceptable both by local and state codes and also The Standard Plumbing Code Book in 90 percent of the country. Check your local codes to make sure you're not in the excluded 10 percent. More questions? I'm as close as a click, Tom

Agree with Tom. If your new bathrooms are in other section of house, just ignore existing vent and install new one, all the way through the roof.