Digging holes to concrete fence posts

I will now widen the side walls a bit more with a rotary hammer and a chisel, and then it should fit. It will be a completely normal wooden fence with 1.8 wide elements.

Although there is already a hole, you cannot dig further directly with the spade? Maybe you don't even need concrete ;)

No, no chance. There are fist- to head-sized stones everywhere. But the earth auger works its way past them well. Those things have to be removed differently.

Crazy crap. I actually don’t have that problem.

you can easily calculate it yourself: a 40kg bag of screed concrete yields about 20 liters of earth-moist concrete

And a 60cm hole with a diameter of 15cm is about 17 liters Not for school, but for life we learn. The stuff from math class is sometimes useful on the construction site ;)

Question to the experienced beyond the theoretical manufacturer recommendations:

Can a point foundation (30x30x80) currently be concreted without concern, although there are occasionally single-digit negative temperatures at night? Is it sufficient to cover the foundation (top edge below turf level) with Styrofoam and simply give the whole thing a few extra days to cure?