Toilets, Sinks, Showers, Tubs and Disposals - Installing toilet on pitched floor

I'm replacing a toilet in the basement with a pitched floor. what is the proper material to fill this gap between the base of the toilet, from no gap in the back to 1 1/8 in. in front? Is there a kit for this, do I fill it with grout?????? The old one might be grout but would like to find out before I tear into this.
thanks, Woodwright.

I really doubt a kit, per se, exists. This is pretty unusual. You should be able to find something to shim with. Try to avoid something that absorbs and that might allow mold/mildew to grow into it.

If you grout it, you may have a hard time pulling that toilet if you need to. I think I would jsut caulk it. I have mentioned this method in other posts, where if someone has a big gap around the bottom of the toilet, you can sort of make it appear the toilet touches the floor by applying caulk, and then troweling around it with a wider putty knife, where you ride the side of the toilet. What you then do is allow the caulk that squirts to the outside of the putty knife, to dry, along with the fill-in. Then after it is dry the next day, scrape up that which squirted out.

How much of a slope? Would self leveling compound resolve issues in area of toilet?

Not a whole lot of info as to floor material, but.... I'll guess concrete and that the flange is set high enough to do this. 1 1/8" in that short a space is HUGE!

This is what popped in my head....

Make a dam out of modeling clay or similar material. Make the top of the dam level with the top of the flange. Make it big enough for the toilet to sit on plus about an inch all around. Fill it with cement...not concrete, I don't think the gravel in concrete would work well in the thinner areas. It would have to be pretty smooth on the inside of the dam to give a good finish. Putty knife and wet fingers would take care of that. A marked line on the floor would give you a guide.

There might be some prep steps I've missed (misting the original floor, bonding agents?, something?). Never done something like this, It's just what came to mind.

You'd need to follow the profile of the base or the sitters feet might be hitting on a square base.

I'm with twelvepole, use Leveling Compound to level out the floor. Cement alone has no strength or durability. Grout maybe but not just Portland Cement.

Well, maybe I didn't mean just cement...I just meant not concrete. Mortar or something like that. Plenty of pavers last forever with some sort of mix other than concrete (large aggregate). I guess there are different grades of everything.

SLC is just kind of expensive, though it might work well with the dam thing I was talking about. I guess that would depend on the true level of the floor.

Who knows, we haven't seen a post back yet......

Well my toilet that's in the basement still works fine, so I'm not ready yet in go into this. I just looking into it first. Thanks for all the suggestions. I over guesstimated on the gap, it's more like 7/8 in. in the front. I bought the toilet (one with a large syphon), so I'll be doing it soon and let you guys know how it goes.