two close wet-vewnted bathroom groups

[Maine Way]

Hello All!

Two toilets on a 3" line to drain drop into sewer (marked "S" in drawing) , each with a wet vent

1. Each wet vent is 2" and serves as drain for one lav and one sho
2. Washers have dry vent connection and seperate drain
3. The second toilet has a wye to connect to wet vent. Is this breaking the rule of toilet enters last, since there is another toilet upstream?
4. Any other comment on pipe size and config helpful!

 

[John Gayewski]

Your washer is causing a problem. You can't drain a washer into the wet vented system. Also each bathroom needs to be seperate for a horizontal wet vent. That is, not only the washer can't drain into a wet vented bathroom group, but neither can another bathroom group. Might as well reconfigure it and keep the toilets last.

 

[Sponsor]

 

[John Gayewski]

This drawing looks like your have plenty of wall to vent through.

 

[Tuttles Revenge]

I can't tell from the schematic but so long as the clothes washers tie in downstream of each of the two separate horizontal wet vent systems and the toilets are the most downstream fixture in each of them and all the trap arm distances are satisfied. Looks good.

 

[wwhitney]

I.e. something like below, where purple is 3" and green is 2".

What matters here is the order of connectivity, and for each shower and WC, the distance from the trap or closet flange to the drain carrying the lav. You'll need 3 dry vents, a 2" vent for each lav, and a 1.5" vent for the two washers.

Cheers, Wayne

 

[Maine Way]

I.e. something like below, where purple is 3" and green is 2".

What matters here is the order of connectivity, and for each shower and WC, the distance from the trap or closet flange to the drain carrying the lav. You'll need 3 dry vents, a 2" vent for each lav, and a 1.5" vent for the two washers.

Cheers, Wayne

View attachment 91805

Hello Wayne!

Thanks fo the clear direction.

Can I tie over to the vertical 2" dry vent of the lav in the same wall to connect washer drain to that vent with 1.5" horizontal off the washer drain pipe or do I need a seperate dry vent riser there?

 

[wwhitney]

Can I tie over to the vertical 2" dry vent of the lav in the same wall to connect washer drain to that vent with 1.5" horizontal off the washer drain pipe or do I need a seperate dry vent riser there?

The washer vent can go horizontal when it is at least 6" above the standpipe flood rim. And then it can tie into the lav dry vent at least 6" above both flood rims.

You show 2 washers, so if you have two standpipes each with its own san-tee, the above applies to the two separate washer dry vents as well.

Cheers, Wayne