DWV Advice

[Vmm_Seattle]

Need sizing and configuration advice for DWV (See above diagram). Worried about distance from first floor laundry vent to soil stack attach (exceed 6 ft ). Any suggestions would be greatly appreciated. Thanks.

 

[Terry]

The washer isn't vented.
The vent is installed within five feet of the trap, and before it joins the wet stack.

 

[Sponsor]

 

[Vmm_Seattle]

The washer isn't vented.
The vent is installed within five feet of the trap, and before it joins the wet stack.

Can it be an Air Admittance Vent (AAV) like one used for an island?

 

[hj]

Wny does every one think "Anyone can be a plumber if they have enough pipe and fittings"? Your vents are undersized and the downstairs drain is not vented. An AAV is NOT a good option for a lower level drain.

 

[Vmm_Seattle]

Why does every one think "Anyone can be a plumber if they have enough pipe and fittings"? Your vents are undersized and the downstairs drain is not vented. An AAV is NOT a good option for a lower level drain.

I mean no disrespect, but technically my vent vents are not undersized. The code requires a vent at least not less than one half the size of the largest soil stack. In this case I may have up to 10 fixture units & a maximum vent length of 30 feet for a diameter of 1 1/2 inches.

The AAV was a proposal since there was little option for other vent placement on the lower level drain. Any suggestion would be greatly appreciated.

 

[Terry]

In the Seattle area, the toilet gets vented with 2".
UPC Code for Washington State.
The area of a 3" pipe is two 2" pipes and one 1.5" pipe.
Most toilet traps are 2".
I have never gone less than 2" on a toilet vent.

 

[Vmm_Seattle]

In the Seattle area, the toilet gets vented with 2".
UPC Code for Washington State.
The area of a 3" pipe is two 2" pipes and one 1.5" pipe.
Most toilet traps are 2".
I have never gone less than 2" on a toilet vent.

I have recently upsized to a 2" inch diameter vent stack for the toilet, shower & sink combined. Still have problem with venting the lower level though. Any ideas would be appreciated.

aundry.

 

[Asktom]

I don't know who's chart that is, but I believe you are under the UPC and are required to have a minimum 2" vent on the toilet.

AAVs only protect against negative pressure and yours would be subject to positive pressure given it's location, thus HJ's comment.

 

[Vmm_Seattle]

Thanks very much for the quick response and for explaining the background about pressurization. Greatly appreciate your help.

 

[Terry]

The revents on the second floor should be at 42" or higher off the floor.
In Washington, you can wet vent the lav over the toilet.

 

[Vmm_Seattle]

The revents on the second floor should be at 42" or higher off the floor. In Washington, you can wet vent the lav over the toilet.

I found the vent size and maximum loading you specified in the code. Thanks.