Relocated Toilet Drain Directly Above 2x10 Floor Joist

[underthetablethinker]

Can I sister the backside of the floor joist and then notch the front side so I can fit my drain in? I can find plenty of advice for drain that needs to go through the joist horizontally, but none when a toilet drain is above the joist.

The nail with green tape is dropped in from the bathroom above, in the center of the toilet drain. It's 1 3/8" from the edge of the joist.

 

[Plumber69]

You can buy a offset flange or a flange with a build on 45 degree angle

 

[Sponsor]

 

[Reach4]

Good move with the nail. Here are some offset flanges, as plumber69 suggests. http://www.siouxchief.com/products/drainage/residential/closet-flanges/offset-flange/fullflush

If you can move the toilet an inch to the right, you might have little or no cutting of the joist needed.

https://terrylove.com/forums/index....ve-toilet-a-3-to-the-right.53209/#post-446426

The Caroma 270 can offset an inch itself, if you could adapt to an 11 inch rough-in.

 

[underthetablethinker]

I should have mentioned the toilet back to from runs left to right in the first picture, so if I move it to the right any further it will be too far away from the wall. I already have it 12 1/4 from drywall as is.

I think the offset flange will be perfect, if I cut into the top of the joist a little bit before it angles I will put a sister on the back side for extra support.

Thank you both for your help.

 

[Reach4]

Ahh. That makes a difference. You could alternatively go with a 14 inch rough-in. The Totos that use Unifit can use a 14 inch adapter. That would cost a premium however.

I am not saying that the offset flange and sistering the joist is undesirable. If you screw and glue the sister joist, it will be stronger-- maybe stronger than the original uncut joist.

 

[Jadziedzic]

Re: notching the top of the joist - see http://buildingadvisor.com/wp-content/uploads/2012/05/Notching__Boring_Guide.pdf for details on how much of the top of the joist could be notched without requiring a sistered joist.

 

[Reach4]

I think I would do wood removal on the joist with a rasp, rather than with a power tool. I think that would tend to make me only remove the minimum required.