Toilet flange install question- best way to build up?

[Gator95]

Installing a floating laminate floor over a slab in a dry downstairs half-bath. No shower, just a sink and toilet.

For a floating floor, the flooring needs to be 1/4" gap all round and also around a toilet flange according to the technical support at pergo.

I had to take out a 1" mud bed to get the old tile out (no idea why they did this on a slab when the house was built in '82), so I had to also cut off the old flange with the plan to put a new one in.

So the question is: Do I just cut the pipe level to the slab and put a flange on, and then put some kind of extender over it, since the flange will be slightly below the level of the floating floor? Or should I shim the flange so it is off the slab and I get the flange ring slightly proud of the finish floor?

If the answer is shim it- any ideas what to use? Was thinking I could even use a 1/4" flange extender ring, but the holes didn't line up for the flange I need to use.

[Sam Conder]

There are flange extenders specifically for that.

[crokett]

Put the closet flange flush on the slab. You can buy a wax ring for the toilet that has a rubber extender on it for situations like this.

[Jim Frye]

More Wax?

There are also extended wax rings available for this sort of situation. You can also buy longer flange bolts. When I install a floating floor in a bathroom, I leave the space around the toilet flange, but I fill the void with sliicone sealer to keep any leaks from going below the floor. I do this where there is a finished ceiling below the bathroom. This way, if the wax ring leaks, you will see it right away because it will run out on the floor and not through the drywall below. Been there, Done that, Didn't like it.