Check out some similar questions!

Milin · May 11, 2009, 04:13 PM

We have five toilets in the house. Do we need a vent for each toilet in the house?

Milo Dolezal · May 11, 2009, 04:15 PM

Yes, each toilet should have 2" vent.

Milin · May 11, 2009, 04:26 PM

Originally Posted by Milo Dolezal

Yes, each toilet should have 2" vent.

All the toilets are connected in the one 4" line.

Milo Dolezal · May 11, 2009, 04:30 PM

You are not saying where you are located and what Code your area falls under. I work under UPC. Under UPC every toilet has to have 2" vent - even thought they all connect to 4" pipe.

Wait for other Experts. They will come up with their own advice according to plumbing Codes they work under.

speedball1 · May 11, 2009, 04:39 PM

Please let us know what Plumbing Code you fall under. Are there other fixtures
In the mix? Would you care to let us in on the configuration? We need more details. Regards, Tom

Milin · May 11, 2009, 04:45 PM

Originally Posted by Milo Dolezal

You are not saying where you are located and what Code your area falls under. I work under UPC Code. Under UPC Code every toilet has to have 2" vent - even thought they all connect to 4" pipe.

Wait for other Experts. They will come up with their own opinions according to plumbing Codes they work under.

Thank you very much. I am in Fiji Islands in the Pacific. I am just looking for qualified solution to plumbing for my new house. The WC and the toilets are all connected to a 4" waste pipe underground. Is it true that only two vents, one at the highest point and the other at the lowest point will do? I have toilet on the ground floor at the highest point and has been vented by 2" pipe. This toilet waste pipe (Stack) runs along the building to the other side and connects to another toilet from the first floor. Does this toilet need another vent? If all toilets need a vent then I will have five vents sticking out from the roof. The regulatory requirements in Fiji are not to standard.

Originally Posted by speedball1

Please let us know what Plumbing Code you fall under. Are there other fixtures
in the mix? Would you care to let us in on the configuration? We need more details. regards, Tom

Thank you very much. I am in Fiji Islands in the Pacific. I am just looking for qualified solution to plumbing for my new house. The WC and the toilets are all connected to a 4" waste pipe underground. Is it true that only two vents, one at the highest point and the other at the lowest point will do? I have toilet on the ground floor at the highest point and has been vented by 2" pipe. This toilet waste pipe (Stack) runs along the building to the other side and connects to another toilet from the first floor. Does this toilet need another vent? If all toilets need a vent then I will have five vents sticking out from the roof. The regulatory requirements in Fiji are not to standard.

massplumber2008 · May 12, 2009, 04:12 AM

Milin...

Vents can connect together behind the walls or up in joist bays, for example, and then penetrate the roof as 1 vent. In my area, you can take a vent from the bathroom sink and use that to vent the toilet.

Check around to see how the other fixtures are vented. See if you can determine that each bathroom sink has a vent... if so, it's possible that these vents vent the toilets.

I'm pretty darn sure that no matter where you live each toilet needs to have a separate vent associated with it (again, even if using a bathroom sinks' vent).

Let us know what you think...

MARK

speedball1 · May 12, 2009, 04:26 AM

Mark's correct! All vents can be connected back to one and run out the roof but no matter where you're located or under what Plumbing Code you fall under every plumbing fixture that has a trap MUST be vented Either by a dedicated vent or a wet vent. Period! No exceptions! Hope this helps, Tom

Milin · May 12, 2009, 03:15 PM

Originally Posted by speedball1

Mark's correct! All vents can be connected back to one and run out the roof but no matter where you're located or under what Plumbing Code you fall under every plumbing fixture that has a trap MUST be vented Either by a dedicated vent or a wet vent. Period! No exceptions! Hope this helps, Tom

I am really grateful for your advice. Can you please explain Wet Venting.

Thanks

Originally Posted by massplumber2008

Milin...

Vents can connect together behind the walls or up in joist bays, for example, and then penetrate the roof as 1 vent. In my area, you can take a vent from the bathroom sink and use that to vent the toilet.

Check around to see how the other fixtures are vented. See if you can determine that each bathroom sink has a vent...if so, it's possible that these vents vent the toilets.

I'm pretty darn sure that no matter where you live each toilet needs to have a separate vent associated with it (again, even if using a bathroom sinks' vent).

Let us know what you think...

MARK

Thank you very much. I am grateful for your advice.

speedball1 · May 12, 2009, 03:53 PM

Can you please explain Wet Venting.

Where Milos code mandates that every fixture have its own vent, my code's more forgiving. My code allows wet vents. A wet vent occurs when one or more fixtures use a fixture that's already vented to use that fixtures drain line for a vent.
It goes like this, Let me show you a typical, (in my area) bathroom group rough in. This configuration only uses one vent for the entire group.
4" ,(under cement and basements) 3" (on first and second floor) from the toilet to the main or stack vent. The lavatory to connect to the toilet drain line and vents to the roof or revents back in the attic to a existing roof vent. The tub/shower 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. More questions? I'm as close as a click. Tom

massplumber2008 · May 12, 2009, 04:13 PM

Here's a visual to aid you with Tom's explanation...

The first picture compares individually venting all fixtures with the idea of using one WET VENT to vent the entire bathroom. The idea here is basically that most people will not be using the sink while using the toilet or the tub so the lavatory vent can act as the vent for these fixtures (as long as increased in size to 2").

The second picture shows a typically wet vented bathroom.

Let us know if you have more questions...

MARK

Milo Dolezal · May 12, 2009, 06:47 PM

Nice way of explaining the venting systems! Sorry, I was disallowed me to rate your answer...

Milin · May 12, 2009, 07:27 PM

Originally Posted by massplumber2008

Here's a visual to aid you with Tom's explanation...

The first picture compares individually venting all fixtures with the idea of using one WET VENT to vent the entire bathroom. The idea here is basically that most people will not be using the sink while using the toilet or the tub so the lavatory vent can act as the vent for these fixtures (as long as increased in size to 2").

The second picture shows a typically wet vented bathroom.

Let us know if you have more questions...

MARK

Mark, this is brilliant illustration. Thank you very much.

Have a good day.

Nalin