Toilet backup issue, caused by improper plumbing

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Tylerloch

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Hello I'm doing a basement finish. I had to jackhammer the concrete subfloor tap into the main line and route a toilet and shower drain. I messed up on my initial plumbing and put a ptrap under my toilet drain. I had to cut the fitting off and put a ninty going straight up from my santee attached to my main line in order to bring the toilet up anywhere near where i needed to be. The water flow comes down the mainline 90s under the concrete foundation and drains to the left across the basement. Now when a heavy laundry load is ran with toilets being flushed i am having soap and water backup out my toilet drain. Now i tapped into the main line very close together and essentially budded my santi's straight to one another one leading out to the shower one to the toilet I put fall on both of my santi's as I installed them and assured proper fall on all my piping. I don't know if I created a trap by putting the santy's too close together I also and wondering if I need to extend the line out for my toilet further away from that main line drain if that will fix my issue. I never take good pictures but I took pictures initially when I piped everything when I had the P-trap installed underneath the toilet i since cut the P-trap fitting itself off and fit a 90 fitting on there directly going up to the toilet so the toilet drain is very close to the mainline I'll attach photos and would appreciate any advice. All 3inch piping on mainline.
 

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Tylerloch

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Thank you I started to realize but your confirmation was what I needed can move forward from here...back to jack hammering ;p
 

Tylerloch

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Okay I just repiped underneath the slab with 2 combo wise combo y to a street 90 leading straight up to my toilet flange and a combo y22 in running to my shower drain still when I have a large load of laundry ran with the toilets flush to the same time I'm getting back up in my toilet closet flange 90. I have an inch and a half vent attached to the main line about a foot above slab. And my branches to my toilet and my shower are only about 5 foot or so from my vent do I need more venting I seem to have quite a bit of backflow. And I have good fall everywhere towards daylight
 

Tylerloch

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Photo of new piping
 

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Tylerloch

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This picture shows my mainline stack with my vent coming out the right and up
 

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Tylerloch

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A sanitary tee is only for use on a the vertical, never on it's back or side.
Irie pipe today with combo wyes. Still on getting soap suds coming up towards the top of my closet flange and when a toilet flushed at the same time water almost comes up out of the top it's better than it was but I'm still getting too much near my opening of the closet flange this is a 3-inch main line with a very large house and a good amount of water coming through I'm assuming possibly the main lines too small or I'm wondering if I need to add another vent line
 

Cacher_Chick

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Really pretty hard to look at the one photo and understand your layout. If you can post a couple more photos with the fixtures connections labeled, it will be easier to sort out what you have going on.
 
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