Re: Washing machine drain routing
The washer drain needs to have some kind of siphon break that's at a level above the water level in the washer. In most houses, this is accomplished by the standpipe: the washer drain hose loops above the high water level and the large diameter of the standpipe (larger than the hose) provides an air gap to prevent siphoning.
If the loop of the hose is below the high water level, water can be siphoned out of the washer. If you just run the hose straight down through the floor, your washer will never fill.
What you may be able to do -- and this should work, if acceptable to your local code inspector -- is to extend the standpipe above the floor but have the trap below. Be careful that you don't have the trap in an area where it could freeze. That could cause an unexpected flood in your laundry room!
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.