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

hampshire20 Apr 2020 08:49

#13

e) When you set the lawn edging stone in concrete, more of it may protrude compared to when you install it without concrete.
f) The more soil mass you retain, the deeper the lawn edging stone must extend into the ground or the concrete base.

Kaspatoo20 Apr 2020 09:15

#14

hampshire schrieb:

e) When you set the lawn edging stone in concrete, more of it may stick out compared to when you install it without concrete.
f) The more soil mass you retain, the deeper the lawn edging stone must extend into the ground or concrete base.

- it will only be set in concrete, without digging in
- a 40cm (16 inches) wide path that applies pressure, the rest of the slope presses underneath at a 45° angle and does not affect the edging stone

tomtom7920 Apr 2020 12:59

#15

You are making a science out of something that is not a problem. An edging stone should be set with one-third of its height embedded in concrete. If you place it directly on the soil without a proper base, it can wash out and become unstable. If it sticks out by 10cm (4 inches), and your stone is 20cm (8 inches) high, you only have about 3-4cm (1-1.5 inches) of soil covering the concrete. So, you need a stone that is 30cm (12 inches) or even 40cm (16 inches) high. Moving stones of 8 x 100 x 40 cm (3 x 39 x 16 inches) by hand is already quite a task.

11ant20 Apr 2020 14:30

#16

Kaspatoo schrieb:

- it will only be set in concrete, without burying it

*blank stare*

https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/

Kaspatoo20 Apr 2020 15:23

#17

tomtom79 schrieb:

You’re making a big deal out of nothing. A lawn edging stone should be set one-third into concrete. If you lay it directly on the ground without a subbase, it can wash out and become loose. If it sticks out 10cm (4 inches), and the stone is 20cm (8 inches) high, you only have about 3–4cm (1–2 inches) of soil covering the concrete. So, you need a stone that is 30cm (12 inches) or even 40cm (16 inches) high. Moving those by hand at 8x100x40 (cm) (3x39x16 inches) is already quite a task.

Ah, so one-third depth is enough.

It’s clear it needs to be set in concrete; just burying it loosely in soil is nonsense.

Thanks, that’s how I’ll approach it.

I’ll go with 40cm (16 inches) where necessary and 30cm (12 inches) where it’s sufficient (costs almost twice as much here then).

tomtom7920 Apr 2020 20:00

#18

Get a pair of pliers to carry them if there are many. I installed 60 pieces, after which my glove and forearms were worn out.

And if you use bagged concrete, use at least one bag per curb stone.

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

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