Foundation for posts terrace roofing

As my predecessor already said, crowbar, small spade or similar and a lot of manual labor. Our foundations were really shoddily made by KD Overdachung. They probably only dug 40-50cm deep, put a flat but wide aluminum profile in there, placed the post on it, filled it with concrete and soaked it with the hose. Fortunately, we still got sliding glass elements whose rail profiles were mounted on another support profile which in turn was screwed to the posts. Otherwise, it would certainly have already settled. Better stick to the specifications and take the effort. The gravel is probably excavated faster than what appears under the gravel. The foundation should be frost-proof so that it does not lift due to the expansion of frozen moisture beneath the foundation caused by frost.

I would have now dug 80cm deep and then placed a concrete foundation pipe made of plastic, filled it with concrete. Put the concrete terrace slab back on and then drilled the post through the terrace slab into the foundation with threaded rods. Make sure to get about 8cm deep into the foundation and done. That should work, right?

I strongly advise you to place the supports directly on the foundations and to notch out the terrace slabs around the supports with the angle grinder. Otherwise, there will be pressure on the terrace slabs and they will break.

Also, the screw / anchor heads are then no longer visible. Visually much better!