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A grinder will almost certainly go through, but will fill the entire building with dust. Fouling the disc with sealant could lead to overheating and the disc breaking in a spectacular way - eye protection and a dust mask will be essential.
You might do better with an oscillating multi-tool and a grout removal blade to take out the first few tiles so a pry bar can be used to lever the rest off. I bought a cheap one for just this sort of thing and was surprised how useful it was - shaping tiles to go around pipework, making access points, and cutting out sections of rotten floorboard and splicing in a new section suddenly became straightforward.
MrE-
I have a multi tool which I got to remove the first tile, which led to this mess! I could do without dust where possible, maybe I just need to open the window and hang a sheet on the other side of the door to prevent a(nother) coating in the bedroom.
Point taken about the grinder, it’s what I feared really. The rubber layer is very annoying.
Dramatic_Hammer
Having had a second quote of £7k (plus VAT 🤬) for our en-suite, I’m now considering carrying on with the DIY.
Anyone got a good idea for getting this DIY’d shower tray out? It’s two complete layers of tiles, rubber sealant and adhesive on top of plywood.
Smashing the tiles off is going to make an unholy mess and take ages to find the screw holes, would a grinder go through the lot without fouling? I can borrow a grinder or ripsaw from work.