Wonky toilet - can I fix it myself?

[FloatingGlasshouse]

Just as a plumber replace an old toilet with new close-coupled toilet. The toilet is leaning to the side quite obviously. The plumber said they could t do anything about it as the floor is not level, although the lay toilet sat straight.

I know it’s really up to the plumber to put it right, but can I use something like a hard plastic wedge shim to prop it up on one side?

The toilet is not wobbling and I would have to remove the silicone sealant at the base to wedge it up. Would Doug this company side any damage? (Eg to wax ring)

Thanks in advance to anyone with advice

is the floor concrete or wood?

post some photos please

Thanks for your reply - it’s concrete, is quite uneven, but I think it would lay flat is moved just 1cm to the side. You can see it’s riding on a higher level on its right. The sealant has been stuck directly to the floor.

Obviously we will be boxing and changing vinyl

I think if it was me I would lift the WC, scrape, scrabble or needle the surface of the old concrete floor, and apply a new, flat, level layer just under and around the pan. Or maybe you could scrabble or chip away the high points that the pan is resting on.

I might put formwork so I could lay a somewhat thicker ( half an inch or so) mortar or screed with neat edges. Thin patches aren't very successful. I'd probably use waterproof Unibond to improve adhesion. I'd wet the old concrete floor beforehand, and I'd cover it with plastic film for a couple of weeks after to get the best practicable cure for strength and hardness. If you can get a diligent, detail-obsessed builder, he could do it in about half a day. It's the sort of thing a semi-retired old codger could do, as no heavy work required. A plumber who was willing to put the time in, and charge you for it, might have suggested it.

Alternatively, if you were to get the floor tiled, the tiler might screed the floor or use thick bed adhesive to get it flat and level, and remount the WC afterwards. Thinking about it, that might be the best option. Porcelain tiles are better for floors. They've very hard and need diamond drills and cutters.

Personal recommendation is much, much better than looking on a website where people pay to be listed and can prevent unfavourable comments being published about trades who aren't, really, checked.

"Scabble"

Thank you PigletJohn for your advice. Yes, it would have at least been useful to have been advised that was the problem before the toilet was fixed - we probably would have held off for the floor to be screened as you suggest.

Due to put the property on market imminently. In the absence of funds to hire a new plumber and fully repair, would removing the sealant to use a wedge plastic shim (razor off the overhang) and then re-seal be in anyway a viable option?
Don’t want to do more harm than good!

don't know. doesn't sound reliable to me.