[ragedriven]

see attached picture

putting in two sets of washer dryers on the opposite sides of one wall (2x4).

I have an existing 2" drain coming out of concrete floor, everything else is planned

i plan to put a clean out near floor followed by a sanitary cross branching out with a 2" vent to basement ceiling vented to side of house.

My questions:

(1)
Will the 2" drain line be capable of draining 2 washers? The books i've seen list the fixture unit FU of a washer at 2, with a total of 4 for the 2 washers. The listed max FU of a verticle 2" pipe is listed as 10 and the max FU of a horizontal 2" pipe is 6. The 2" pipe coming out of floor changes to a 3" by a 3/2 bushing below the slab before it goes horizontal, so there is never a horizontal 2" segment of pipe carrying double capacity. The 3" pipe was not carried up the wall because it is 2x4.

[QUESTIONS 2&3 might need to be asked in another forum]
(2)
Being a 2x4 wall, a 4" dryer vent will not fit. I plan on running 3" dryer vent to ceiling and transitioning to 4", for each dryer seperately. Is this unsafe to have an approximately 6 ft. section of 3" vent pipe for each dryer or merely not ideal. Worst case I could use 2x2 lumber to widen the wall to allow 4" dryer vent.

(3)
I have to have the washer/dryer on the right stacked. How is this laid out? Dryer is ontop of washer right? Not sure of height requirements.

Please correct me, typically 120V washer outlet is higher than washer box in case of leaks. And the dryer vent and 240v would be higher than the washer box in a stacked setup.

[massplumber2008]

Hi Rage...

1) You will be fine with the 2" pipe. Although, FU count is probably closer to 6 FU as these washing machines will have a 2" waste line. You should still be just fine with that 3" below the floor.

2) Widen the wall with the 2"x2"... do NOT reduce the dryer vent in any way. Clothes will take longer to dry, lint will build up quicker and is not recommended by the manufacturer. Adding a cleanout tee with a cap in each dryer line will help you to vacuum the dryer lines out in the future... especially as they go vertical.

3) Dryer is on top. The 240V electrical box for the dryer and the 120V for the washer should be at a height just above the washing machine.

Good luck...

MARK

[ragedriven]

I have had someone else tell me to tear up the concrete and continue the vertical 3" pipe up through wall and widen wall using 2x2.

or use a #5 fittings (whats a #5 fitting?)

[massplumber2008]

Well now... that is a problem now and then... different code books dictate different acceptable standards.

At this point I can only advise you to call your local plumbing inspector (or the next town over... ;)) and just ask him what he would accept... only way to get most correct answer for you.

Let me know what he says... O.K.?

MARK