Fence construction - mounting posts on uneven sandstone wall?

Hello

possibly rent a core drill (90 euros per day) and drill slightly larger holes vertically. Insert the posts, align them, and pour concrete.

Steven

I would first stretch a cord and align it vertically. Then distribute the posts, drill holes, and as in the drawing, do not screw the posts directly onto the stone, but counter them with a nut. This way you can properly level them. I assume that there are 4 holes per base plate. Finally, the gaps between the base and the masonry are filled with mortar.

A good idea! But up to what height would that work? The elements are 2.50m long and 1m high. The sandstone shows differences over the entire length of sometimes more than 5cm, so in extreme cases such a "mortar foot" would be quite high...

That means the bases do not rest fully on the wall but only on the three or four screws. This makes it "wobbly" and at least significantly reduces the "bending strength" of the post.

That’s also a bit of my concern. The "milling solution" would certainly look better visually, but I imagine it’s more complicated (I don’t have a router, let alone a suitable stone cutter for the 6cm thick posts). Could the recess then also be filled with mortar to prevent water problems? Or would that damage the powder-coated posts?

Maybe rent a core drill (90 euros per day) and drill slightly larger holes vertically. Insert the posts, align, and pour concrete.

Sounds like the easiest option. How deep would one have to drill or how far are posts usually concreted in? I can’t find any length specification for the posts (but could cut them to size with a grinder if necessary). I’m also a bit afraid that the sandstone might break due to the holes/load. They are blocks in the format 40x40x about 80cm:
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Hello Changeling

I would set the core drilling about 20 cm deep.
Stainless steel posts would be advantageous. Otherwise, you might get rust problems. Adjust the posts to the height of the drilling each time. Pour in repair cement and spread some of the rock dust from the drilling on top. The core bit goes slowly into the stone. Nothing breaks there.

Steven

What purpose is the fence supposed to serve? Escape protection for pets or merely privacy? In the latter case, I would find a thuja hedge a more visually appealing option - it grows around the stone and forms a wonderful unit with the stone wall in a few years. However, it is not for the impatient. And please, no [Kirschlorbeer] - it is almost useless for our wildlife.

Escape protection for pets

That's what it's supposed to be. Also fall protection for the children.
For privacy screening, there is a small colorful hedge behind it.

VA posts would be advantageous.

... sorry for the silly question, VA is stainless steel?
Are the linked powder-coated posts therefore not sufficient?

Is VA stainless steel?
So the linked powder-coated posts are not sufficient?

Hello
Changeling

in principle, yes. But as soon as you cut the posts, the spot for rusting is already there. Or if a small chip hits the powder coating. or, or, or.
If you haven't bought anything yet, take V2A or V4A. The additional cost balances out in practically eternal durability.

Steven