ᐅ Fence Construction – Installing Posts on an Uneven Sandstone Wall?

Hello

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

Steven

Neubi-BY schrieb:

I would first stretch a string line and make it perfectly vertical. Then distribute the posts, drill the holes, and, as shown in the drawing, do not screw the posts directly onto the stone but secure them with a nut on the back side. This way, you can properly level them. I assume 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 2.50 meters long and 1 meter high. The sandstone shows variations over the entire length, sometimes more than 5 cm (2 inches), so in the worst case such a "mortar base" could become quite high...

superzapp schrieb:

That means the bases do not rest fully on the masonry but only on the three or four screws. That makes it “wobbly,” or at least significantly reduces the bending strength of the post.

That is kind of my concern too. The “routing solution” would certainly look better, but I imagine it would be more complicated (I don’t have a router, let alone a suitable stone cutter for the 6 cm (2.4 inches) thick posts). Could you fill the recessed area with mortar to prevent water issues? Or would that damage the powder-coated posts?

Steven schrieb:

Maybe rent a core drill (90 euros per day) and drill somewhat larger holes vertically. Set the posts in, align them, and then pour concrete.

Sounds like the simplest option. How deep would one normally drill or embed the posts in concrete? I can’t find any length specifications for the posts (though I could shorten them with an angle grinder if needed). I’m also a bit worried that the sandstone could crack from the holes or the load. The blocks are in the size of 40 x 40 x approximately 80 cm (16 x 16 x 31 inches):

Hello Changeling

I would drill the core hole about 20cm (8 inches) deep. Stainless steel posts would be advantageous to avoid rust issues. Adjust the posts to the height of the hole. Fill the hole with repair cement and sprinkle some of the rock dust from the drilling on top. The core drill goes slowly into the stone, so nothing breaks.

Steven

What is the purpose of the fence? Is it to prevent pets from escaping or just for privacy? If it’s the latter, I think a Leyland cypress hedge is a more visually appealing option – it will grow around the stone and in a few years create a beautiful unity with the stone wall. However, it’s not suitable for those who want quick results. And please, avoid using cherry laurel – it is practically useless for local wildlife.

hampshire schrieb:

Pet fall protection

That’s what it will be. Also fall protection for the children.
There is a small colorful hedge behind it for privacy.

Steven schrieb:

Stainless steel posts would be beneficial.

...excuse the silly question, VA means stainless steel?
Are the linked powder-coated posts not sufficient then?

Changeling schrieb:

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

Hello
Changeling

Basically, yes. But as soon as you cut the posts, that area becomes susceptible to rust. Or if the powder coating gets a small scratch. And so on.
If you haven’t bought anything yet, go for V2A or V4A stainless steel. The higher price balances out in the practically lifelong durability.

Steven