You're not confusing me with Vectrex now? It's him who is reasoning about compressive strength.
(As usual) we might be over-analyzing the whole thing, but like all DIYers, we want to be able to sit down with a little whisky in front of the fireplace when it's done and feel satisfied that if an earthquake were to happen, the whole house might shake apart, but the stove would darn well stand strong.
Yes, I did, sorry!
I'll probably have to go into town tomorrow and stock up on whisky so I can see properly
Took care of the problem this weekend and cut a 0.8 x 0.8 large hole in the floor. The slab turned out to be quite thin with about 1dm of insulation underneath. Bought 7 bags of coarse concrete at byggmax and a reinforcement mesh and filled the hole. Did not anchor it to the rest of the slab but cut away some of the elephant mat so that the concrete would penetrate under the remaining slab.
Even if it might not have been necessary, it feels good to know that there are now no doubts about whether the floor will hold or not.
