DWV Layout Assistance

[robh]

Mikey: Do I need 2" for the waste section or do I just need to extend the 2" vent pipe down to the sanitary T?

 

[Mikey]

I think the standpipe and waste line need to be 2", but wait for a real plumber to cite chapter & verse. Modern washers throw an awful lot of water out the drain in a big hurry.

 

[Sponsor]

 

[Redwood]

Good catch Mikey! I missed that change...
The washer standpipe, p-trap, & drain need to be 2"
The vent can be 1 1/2"

 

[robh]

Thanks for the advice on the washer pipe. I decided to stick with 2" for the vent portion since I am tying it into the 2" toilet vent. I also moved the shower vent over a couple of joists to make room for the washer p-trap. Lastly I tied the vanity drain vent to the main stack to save on a roof penetration. Any last bit of advice on this layout? Thanks so much for the feedback.

 

[Mikey]

Clothes washer drain still labelled as 1 1/2", but colored as 2". It also looks kind of high -- check local regs to see how high/long the standpipe needs to be.

 

[hj]

drain

It looks like it happened when he relabled the size.

 

[Redwood]

As far as the actual size and basic design it looks good. Now if the actual nuts & bolts get put together right...
This would include the details like pitch, trap height and standpipe length...

 

[robh]

The last installment I hope

Ok...so I looked up code on the standpipe for the washer and it looks like 18-30" is ok. So I made it 30" above the P-trap. I also corrected the labels for the washer ( it is 2" ). I assume that the shower vent and the drain pipes should have a 1/4" per foot pitch.

 

[Redwood]

The top of the washer standpipe also needs to be above the top of the washer so that the water will not drain by gravity. With washers most do not have a valve on the discharge so if the drain hose goes below the water level in the washer it will drain by gravity.

 

[robh]

Ok...I think that's it. Thanks to all who commented. If I can help with sketchup or anything else computer related let me know.

Cheers,

-R

 

[Redwood]

We do require in process and after pictures for our advice you know... LOL

 

[robh]

That's like asking to see baby pictures -- be careful what you ask for.

 

[Redwood]

We maintain in process quality control and pat you on the back when you're done.