Hi, I'm trying to replace my toilet in a house that I bought. When I removed the old toilet I found that the cast iron flange was rusted away with no way of actually securing the toilet to the flange. I removed the old flange by cutting and breaking it off (no damage to the drain pipe). I have purchased a cast iron twist-lock flange for the replacement. Everything to this point is working well... other than the drain pipe is too high for the floor. I again cut some the old flange/drain pipe and now I think it will be flush with the flooring, which I am also replacing. But now what I'm wondering is which part of the flange needs to be flush, the top or the bottom. I see that there are holes for lags to secure to the flooring, but I've also seen pics that show the top of the flange level with the floor without putting lags in at all. Is there anyway that is better and will I have any problems with the toilet sitting on the floor? Also should I use some sort of sealant with that twist-lock flange insert? Thanks

Hey Spence,

The flange sets on top of the finished floor. The toilet bowl sets high enough so it doesn't bother. If you think the flange can work itself loose then, by all means, lag the flange down with Tap-Cons or masonry screws. No sealant, except a wax seal is needed. Good luck, Tom

Thanks, my thinking was correct then, the help is greatly appriecated.