We are trying to move our washer to our basement and we just want to make sure we are doing it right. We have a drain pipe in our crawl space about 14 feet from where we are putting the washer. The drain pipe comes from the bathroom upstairs. We are planning on running a pipe from the washer at a decline to the drain pipe. We are not quite sure how big that pipe needs to be or how much of an decline we need. We then have to run the declined pipe through our basement wall and down to the washer is there any special things we need to install to make sure the water can go up and to make sure it doesn't drain back into our washer?

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Originally Posted by missikid15

We are trying to move our washer to our basement and we just want to make sure we are doing it right. we have a drain pipe in our crawl space about 14 feet from where we are putting the washer. the drain pipe comes from the bathroom upstairs. we are planning on running a pipe from the washer at a decline to the drain pipe. we are not quite sure how big that pipe needs to be or how much of an decline we need. we then have to run the declined pipe through our basement wall and down to the washer is there any special things we need to install to make sure the water can go up and to make sure it doesn't drain back into our washer?

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I'm a little confused by the question. "Decline" means to "slope down" yet you want to make sure the water will go "UP" and not drain back into the washer. You can't drain up if you use gravity for a force. Please explain, Will any part of this have to drain up hill?
Having said that, you've got problems from the git-go. (1) You're proposing to discharge a major fixture,(your upstairs toilet and bathroom) past a unvented minor one, (your washer) This is against code and not good plumbing practice. (2) ALL fixtures that are trapped will have to be vented, you didn't address venting the washer. How do you plan on doing this? I can get you out from having to run a washer vent out the roof by installing a Studore Mechanical Vent just downstream from the trap but I'm stopped by the part where you want the water to drain up. You're going to want to run 2" pipe at 1/4" drop to the foot. The fall being from the washer trap to the tie in point of the vertical stack. Let me know your thoughts. Tom

Sorry I didn't explain well the water will be going up the wall then we have to extend the pipe from the washer to tap into an existing drain pipe. And I did not mention any thing about venting because I did not know we had to do this. Could you please explain more about the venting. And the decline I was talking about was the extension part on the pipe from the washer that has to run down to meet the existing drain pipe.

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Originally Posted by missikid15

Sorry I didn't explain well the water will be going up the wall then we have to extend the pipe from the washer to tap into an existing drain pipe. and I did not mention any thing about venting because I did not know we had to do this. could you please explain more about the venting. and the decline I was talking about was the extention part on the pipe from the washer that has to run down to meet the existing drain pipe.

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How far up the wall will the water have to go before it slopes down to the stack? The washer pump will only pump so high. You can probably install a Studor Mechanical Spring Loaded Vent just downstream from the trap to save you the hassle of having to run a vent to the roof, ( you didn't think this was going to be easy did you?) I'm still confused, Why not install a trap close to the floor with a 36" standpipe to hook the discharge hose into and then slope to the stack? That's the way we usually do it. Regards, Tom