Three Inch Drain Pipe.

AbeBarker

I'm putting a bathroom on the second floor of my house. It's a remodel job. Two years ago I remodeled my living room which is under the proposed bathroom, so I stuck a 3 inch PVC pipe in the 2x4 wall bay and sealed the room up with drywall.
Now my plumber wants to put a 4 inch drain in. Why isn't a 3 inch drain suffice? This is 3 inches interior diameter. I don't want to because my living room is in mint condition so furring out the wall would suck baaaaaad!

PARA1

Just using the info you provided a 3" stack will do fine.

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Putty Truck

3" is fine, but pvc is not for a riser because:

1) Noisy. Imagine sitting downstairs and hearing the toilet water cascading down like a waterfall. Use cast iron to cut down the noise.

2) Fragile. The first picture that gets hung will be right where the pipe is and the picture hanget will be a 16p nail. Untold millions have been made replacing broken risers. Use cast iron.

threaderman

There's your three opinions.I concur,3" is fine.

Ron The Plumber

AS far as I know 3" pipe does not fit into a 2 x 3½" wall.

Putty Truck

If it don't fit, can he use one 2" and one 1-1/2"?

AbeBarker

It's an older house where the 2x4's are actually 2" x 3 3/4" deep. Cast iron is interesting... I come across PVC risers quite often when opening up walls.

Thanks for the advice.

AbeBarker

what about 4 inch dryer vent flexable duct? Then I can route the drain any which way neccesary.

Ron The Plumber

If you did get 3" stubbed into that wall you will have to add a coupling to add to it.

Add a hub fitting and now the OD is even bigger.

mdshunk

You need to get out more.

AbeBarker

The three inch pipe runs in the wall behind my 1st floor bathtub. From underneath in the basement the bottom of the 3 inch pipe is in the alcove of where the tub meets the wall. I have workable access from the basement. It will be a hassle but such is remodel work.

masterk

I put 3" pvc in 2x4 walls all the time. You have to cut the top & bottom plates all the way out but the od of the pipe is flush with the 2x4 wall. On an interior non bearing wall this is fine to cut the plates out.

Ron The Plumber

Yes it will be flush, just don't add a fitting in the wall or it will protrude out of the wall.

AbeBarker

At the top of the 3 inch rise I needed a 3 inch T-Y fitting. My joist are 2x10's and there is no subfloor or bathroom partition walls yet. The only way I could think to get the T-Y fitting low enough was to cut the top plate out so the fitting slid down against the 4 5/8 inch crown molding that I have in the room uderneath.

Carpenters can make excellent plumbers... right?

Putty Truck

Now I've got a headache...I'll send you a bill.

Hey, do you use that Stiletto hammer, too?

cmvsap

you can run 3 full baths on a 3" stack, ofcourse 3" is plenty. if youre roughing a job does anybody put in cast iron, cost difference is huge. I have pvc in my walls and I dont here any cascading falls. why dont you do a side by side comparisan and see which produces more decibles, I'm sure the difference is not great. stick to service work..

KillerToiletSpider

You do that where I am you'll be tearing it back out.

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Ron The Plumber

Nope, where all electricians.

Putty Truck

Spoken like a true "track slut".

AbeBarker

What a stereotype.