ᐅ How deep should an edge restraint stone be set in concrete?

Created on: 17 Apr 2020 21:18

Hi,

I want to install a lawn edging stone along a slope as a boundary. On one side, it should slightly protrude, while on the other side, a small path should run flush with the top edge. In other words, there should be a step along the edge. Ideally, the step should be about 20cm (8 inches) high.

The affordable standard stones are usually only 25cm (10 inches) high, but they are also often available in 30 or 40cm (12 or 16 inches) heights.

The question is: how much of the edging stone needs to be concreted or buried on both sides below ground to ensure it stays firmly in place?

I have seen many pictures where edging stones are used as step borders for patios or garden stairs. The steps there typically stand about 15cm (6 inches) high and are visible from the front. Or for flower beds adjacent to lawns, where the beds are at least 10cm (4 inches) higher than the lawn, and one side of the edging stone is clearly visible.

Is there perhaps a rule of thumb stating that one-third or half of the stone needs to be set in concrete to hold firmly? If I were to use a 40cm (16 inches) stone, would a concrete depth of about 20cm (8 inches) be enough?

Thanks and good luck

tomtom7918 Apr 2020 08:00

I would also like to point out that if the wedge holding the bottom board is too close to the turf, it will dry out too quickly during the summer.

11ant18 Apr 2020 14:04

So, you would create a "joint" between the paving, gravel, and so on?

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hampshire18 Apr 2020 15:19

If you use lawn edging stones and belong to the group of people who prefer “cleanliness and order” in their garden, follow the recommended approach.

If you prefer a more natural edge without using additional space, a simple solution is untreated thick wooden boards held in place by iron rods driven a meter deep into the ground. The boards will naturally decay over the next 15 years, creating a picturesque effect while leaving behind a stable, established structure.

Kaspatoo18 Apr 2020 19:24

#10

And why does something like this hold?

It’s not as if the hill is pressing directly against it, since there is a 40cm (16 inches) wide path in between, and behind that are supporting rubble stones.

Light gray paved cobblestones with grass strips next to a concrete curb.

Person wearing a hat installing concrete steps at the house, kneeling, with tools and wheelbarrow in the garden.

Concrete steps terracing a green lawn; a tree with autumn leaves stands in the middle, with a wooden bench on the right.

tomtom7918 Apr 2020 19:26

#11

Because it is deep enough in the concrete, it holds.

Kaspatoo19 Apr 2020 14:24

#12

tomtom79 schrieb:

Because it’s embedded deep enough in the concrete, that’s why.

I strongly believe these are just standard curbstones, with about 10–20cm (4–8 inches) protruding above ground.

I base this on having seen many similar pictures and descriptions often mentioning lawn edging stones. And it seems they aren’t available in heights over 40cm (16 inches).

So either
a) I’m mistaken
b) people are exaggerating in their construction blogs
c) embedding half the stone in concrete is sufficient
d) larger curbs do exist, but neither local hardware stores nor building material suppliers are aware of them

ᐅ How deep should an edge restraint stone be set in concrete?

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