As most people say look to god for answers. i say the same take it straight up through the roof.
ANS 2 - First , snake or probe this drain that backs up. =There are reasons for this sort of thing. It may save you alot of trouble and expense to fix the simple things first.
The main line drain is clogged or septic yank needs clean out.
There's no stress on a vent stack, so there's not much chance it broke,(unless something happened that you forgot to mention.)Just to be sure you can go up on the roof and shine a light down the stack, see if maybe a bird or squirrel built a nest in it, but I doubt it.Check the wall behind the washer and the wall in the bedroom that backs up to the laundry.Is the floor wet or the wall stained down by the floor?,Can you check the ceiling immediately below the washer?My guess is that the drain for the washer is leaking or overflowing.There's really no back pressure and not enough vapor in a vent to permeate a wall.
There is usually some space around the drain hose where it goes into the drain. This usually allows enough air to get in that it is not a problem. If the washer hose is connected to the drain tight, then yes, there needs to be a vent above that connection. There may already be one above the drain if you follow it up. Most washer drains are fairly close to the main stack which allow for venting. The only question is, Does the washer drain alright? If so, don't worry about it.
The drain from the toilet to the main or the main itself is partially clogged or collapsed. There is probably enough room for the sink to drain but the washer puts out so much water all at once it can't get through and backs up into the tub and toilet.
Rodd the drain.
Sounds like a venting problem. The washer is trying to push the water down the drain and the tub is an easier route. When it stops pumping, the washer drain become the vent and lets the air escape. You can try some drain cleaner in the tub and the washer drains. This may open it enough to help.
The drain from the washer to the main line is getting plugged and the floor drain is easier. Drain cleaner in the floor drain should take care of it.
I am assuming that the question means the water backs up when the washer is used. When the washer drains, it forces a significant amount of water into your pipes in a fairly short period of time. If your pipes are even partially blocked, this large quantity of water can overload the system. However, if this problem occurs at times other than when you do laundry, and there are no other indications of slow or blocked drain lines, I am stumped.
Your drain line is plugged somewhere after your shower and toilet line are connected. The reason for the gurgle in your toilet is because air is trapped in the drain and your toilet is the closest place for air to flow to. If you had a vent on your toilet trap arm then it would gurgle in the vent rather in your toilet but your drain is still plugged and needs to be snaked out and maybe your drain line needs to be examined for right grade or broken.
Because the drain is plugged up somehow downstream from it. Not all plugged drains are totally blocked, many are built up with years of grungy goop, often leaving only a small hole. When a sudden onrush of water as from a washer discharging meets this hole it backs up. You need to auger your drain.
partially clogged drain or vent, improperly installed vent or drain
Stopped up vent or improperly installed vent.