I am installing a stacked washer/electric dryer on an inside wall of a first floor kitchen. I cannot easily vent the washer to the roof and there is no other plumbing close to piggy back on. Would I have enough rise to run the washer vent horizontally 15' through a ceiling joist bay to the outside wall? Is there a code on vent rise?

What about the electric dryer vent? Could I run it up and out through the same joist bay?

Horizontal vent should be installed with 1/4" per foot up-slope. So, you will need about 4 1/4" of space. Assuming the joists are at least 2"x 6", you should be OK.

Question: what do you plan on doing with the vent once you penetrate the exterior wall ? Are you going to continue all the way to the roof ?

I was hoping not to run pvc all the way to the roof, but possibly end it just through the exterior wall with a 90 degree elbow facing downward.

Any idea on the dryer vent? Same rise? I know I'd need to put a clean out in it somewhere.

In my area of operation you could not terminate vent on the side wall. It has to terminate above the roof. If you install it the way you plan, you will smell sewer odor every time you open window above. Besides the smell, it will become health hazard, too.

4" clothes vent can be run horizontally and yes, you can terminate it on the side wall. Finish it with louver hood so birds don't nest inside. Yes, it should also be installed with up-slope, but but it is not as critical as sewer vent.

Thanks Milo. Very Helpful

Quote:

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In my area of operation you could not terminate vent on the side wall

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But in my area, (Standard Plumbing Code) you can. Section 1404.5 of the SPC titled "Vent Extensions Through Wall" says:
Vent terminals extending through a wall , when approved by the plumbing official , shall be located at least 10 feet horizontally from any lot line. They shall be turned to provide a opening upward. They shall be screened and meet the requirements of 1404.4 which states:
No vent terminal shall be located directly beneath any, door, window or any other ventilating opening of the building or any adjacent building, nor shall any such vent terminal be within 10' horizontally of such a opening unless it's at least 2' above such opening. Vent terminals shall not terminate under the overhang of the building.
Hope this helps. Tom

Aren't plumbing codes great?

In my area, the International Residential Code plumbing provisions would allow you to vent the washing machine with an air admittance valve and thus, no penetrations to the exterior of the structure at all.

You could also vent it through the floor using an 'island vent' arrangement:

http://www.rd.com/images/tfhimport/2...g001_size2.jpg