Grinding/milling terrace concrete? 2-4 cm, no slope

Hello,

I have an unpleasant task ahead of me and would like to know your opinion on which options and solutions are best suited.

Our terrace was concreted and the slope is not correct at the front and back. Tiles will also be added. I cannot "fill up" because then I would be too high at the terrace door.

I have about 38m2 of terrace and need to go down about 2-4cm. Of course, not the entire surface, but basically most of it needs to be worked on.

[B]Is grinding sufficient here? Does it need to be milled and then ground?[/B] I would rent the appropriate equipment. Is it realistically possible to grind 2-4cm of concrete at all?

It is very annoying, but one is always wiser afterwards....

Thanks in advance!

No, that is probably too much. We once had the problem at work that the floor of an underground garage entrance was poured too high. The company completely chiseled out the concrete over about 12 sqm because that was more economical and faster. Milling is doable in the range of 1-2 cm but is also extremely expensive and time-consuming. Apparently, there are no machines that work efficiently at that size, like in road construction, for example.

No, that is probably too much. We once had a problem at work where the floor of an underground garage entrance was poured too high. The company completely chiseled out the concrete over about 12 sqm because it was more economical and faster. Milling is feasible in the range of 1-2 cm, but also extremely expensive and time-consuming. Apparently, there are no machines that work efficiently at that size, like, for example, in road construction.

Chiseled out means piece by piece, right (Hilti)? And then ground? If milling, I would just do several rounds, but then the floor has to be ground again, right? Unfortunately, that's a nasty job. Dust/dirt to the max...

Tiles on the terrace, especially on surfaces exposed to moisture, are always very problematic. Sooner or later, they will freeze. Rather sooner.

You can also forget about sanding the surface. Basically, the only option is dismantling and trying again.
So a digger with a breaker hammer and completely remove the concrete. Reinstall formwork with a slope and pour new concrete.

Or leave it as is, put tiles on it and install a terrace roof over it. Then it should work without a slope as well.

In the picture, you also can't see how much clearance there is up to the door. I would say a 3 cm slope is more than enough considering the depth of the terrace.

I do not want to take over the thread but what about approximately 0.5 cm? Which device could be used for that? For me, it is more about the garage and only an area of maybe 2-3 sqm.

I don't want to take over the thread, but what about approximately 0.5cm? Which device could be used for that? For me, it's more about the garage and only an area of maybe 2-3 sqm.

The screed layerer had a milling machine, similar to the one used for parquet, with which he smoothed the garage and removed the slurry; how much concrete was removed with it, no idea, but it already looked like it could work.