3" Riser for Toilet Flange - Thinking that I May Need to Change to 4"

[Cai24]

I have a second floor condo and am remodeling my master bathroom. Normally I do everything on my own, but with this being a condo, I'm fearful of leaks. Once my subfloor is closed, I have no access except for the unit below. I had a plumber come in to help with the toilet rough in. He installed a 3" riser, and I cut a 4 1/4" hole in the subfloor. What I realized is that the flange will fit fine, but I will have a difficult time getting primer and cement applied. I'm afraid to make a larger hole, because I know it's important to have as much support as possible. My concern is that I won't be able to prime/glue the flange properly once I'm ready to set it (after tile install). I know they have brushes, so maybe that would be an option? In hindsight, I probably would have been better off using a 4x3 elbow and having a 4" riser pipe, so I could use an inside flange. I know the 3" inside flanges are not recommended, so I would prefer to avoid that. I'm thinking about getting a plumber out again to change this, but I wanted to check first. My understanding is that I can't use a 4x3 reducer on the riser portion (only the 90 elbow). I appreciate any advice!

 

[Reach4]

I'm afraid to make a larger hole, because I know it's important to have as much support as possible.

If you leave plenty of wood to hold up the outside, you should be fine making the hole bigger. You may have to work at that.

Consider an outside compression flange, such as "Code Blue". You will need to have sufficient clearance outside of the 3-inch pipe. When you glue, you need to get it right the first time. With compression, you get do-overs. How far above that subfloor will the finished floor be? You will want to know that and have your new flange available before cutting that PVC.

Plumbest C40-320 3inch pipe outside. 2 inch deep.

Jones Stephens C40320 3 pipe x 2 depth ***

JONES STEPHENS 3 in. x 2 in. No Caulk Code Blue Cast Iron Water Closet (Toilet) Flange for Cast Iron or Plastic Pipe C40-320 - The Home Depot

Give your furniture a fresh and updated look with the help of this extra ordinary Jones Stephens Quickset Cast Iron Closet Flange. Easy to handle.

www.homedepot.com

Jones Stephens 3" x 2" No Caulk Closet Flange Blue P/N C40-320 | eBay

See photos. In the event that any clauses or phrases contained here within are ruled out by a judge, the law, a lawyer, jurors, and or any other entity all others remain in effect.

www.ebay.com

I would tend toward this one:

Pardon Our Interruption...

One seller had one where the photo showed only 3 of the 4 bolts. I did not paste that link.

If you go that route, please post measurements. One thing I don't know is if the PVC pipe can extend above the black. That would make cutting the PVC pipe much less critical.