|Posted by hj on August 05, 2004 at 09:19:30:|
|In response to Re: Standpipe and Trap Code with Under Counter Euro Washer|
In this area there are many washing machines with low standpipes. The majority of them overflow when the sink drain becomes obstructed. In most cases the riser is exposed so the overflow is noticed fairly quickly, but since the sink will drain while the washer is overflowing, there may be a lot of water on the floor before it is noticed. In your case, since it will be concealed, I hope the floor material is something that will not be damaged by water overflow if this should happen.
: The top of the 2" standpipe (drain) is secured to the bottom of the LSP metal wall box, located under the countertop, at the 22" height using waterproof washer and nuts on both sides. The washer's drain hose hooks into the standpipe and is secured. The drain hose is 1" hose, I believe, leaving an air gap between it and the standpipe. From there, the standpipe runs down vertically to the p-trap which can be located anywhere from 2" to 6" above the floor (measuring to the bottom of the trap). From the standpipe to the 2" vent/drain is a run of 38" (this can be shortened by at least two feet, but the underlying drain can't without considerable work). This dumps directly into a 2" cast iron drain located in the crawl space running along the foundation. This 2" cast iron drain is shared with the kitchen sink/dishwasher/dispoer located upstream, but in the same room as the the washer (about 11-1/2' upstream). The 2" drain dumps into the 4" main drain to the street. There is no separate sink specifically for the laundry. The old 1-1/2" standpipe for a freestanding washer had no p-trap and a height of 32-1/2". We didn't have a dishwasher and garbage disposer then, but we never had a back-up or odor problem in 11 years. The single bathroom plumbs into the 4" main downstream of the kitchen/laundry. The bathtub and shower would most likely back up before the standpipe should the main become clogged (most likely due to roots at the street).