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Sackkarre16 Mar 2017 10:53We want to create a gravel strip around our house and border it with edging stones. The planned wooden terrace will be bordered in the same way.
In total, the edging strip is about 50m (55 yards) long. The height difference to the top edge of the edging stones varies depending on the side of the house: 20cm (8 inches) for about 10m (11 yards), 25cm (10 inches) for about 30m (33 yards), and 38cm (15 inches) for about 10m (11 yards). The stones planned are interlocking lawn edging blocks, available in heights of 15cm (6 inches), 25cm (10 inches), and 30cm (12 inches). The ground has already been prepared with compacted frost-protection material. Now, to the questions:
- I planned to set the stones into a concrete base and fix them laterally with a concrete wedge. For height adjustment, I would need about 5–8cm (2–3 inches) of concrete, depending on the stone height. Is this a common thickness, or is it too much/too little? Or should I increase the level a bit with frost protection material beforehand?
From what I have read, lean concrete is recommended here:
- Is the mixing ratio approximately 6–8:1, correct?
- What grain size should I use for the aggregate, 0–8mm (0–0.3 inches)?
- For the planned length, varying heights, and the concrete wedge, how many kilograms of cement and aggregate (or concrete mix) will I need? What is the general rule of thumb per meter (yard) of edging stone?
- How many liters of water per kilogram of concrete mix do I use for mixing?
- Can I fill the strip with gravel after 24 hours curing time, or how long should the concrete cure?
- Are there any other important considerations or tips?
In total, the edging strip is about 50m (55 yards) long. The height difference to the top edge of the edging stones varies depending on the side of the house: 20cm (8 inches) for about 10m (11 yards), 25cm (10 inches) for about 30m (33 yards), and 38cm (15 inches) for about 10m (11 yards). The stones planned are interlocking lawn edging blocks, available in heights of 15cm (6 inches), 25cm (10 inches), and 30cm (12 inches). The ground has already been prepared with compacted frost-protection material. Now, to the questions:
- I planned to set the stones into a concrete base and fix them laterally with a concrete wedge. For height adjustment, I would need about 5–8cm (2–3 inches) of concrete, depending on the stone height. Is this a common thickness, or is it too much/too little? Or should I increase the level a bit with frost protection material beforehand?
From what I have read, lean concrete is recommended here:
- Is the mixing ratio approximately 6–8:1, correct?
- What grain size should I use for the aggregate, 0–8mm (0–0.3 inches)?
- For the planned length, varying heights, and the concrete wedge, how many kilograms of cement and aggregate (or concrete mix) will I need? What is the general rule of thumb per meter (yard) of edging stone?
- How many liters of water per kilogram of concrete mix do I use for mixing?
- Can I fill the strip with gravel after 24 hours curing time, or how long should the concrete cure?
- Are there any other important considerations or tips?
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daniels8717 Mar 2017 11:13I’m joining the conversation here since we are about to start this as well.
First of all, I’m not an expert. I was told:
Lean concrete mix 8-10:1.
We still have some leftover screed at our place. I believe it’s 0-8mm (0-0.3 inches).
A friend advised me not to skimp on concrete and not to create a wedge. Rather, more like in my attached picture. This way, the curb can better handle lateral loads. Approximately 0.14 cubic meters (5 cubic feet) of concrete per meter (3.3 feet). However, I’m not sure if that might be overdoing it—maybe appropriate for paths that will be driven on?
First of all, I’m not an expert. I was told:
Lean concrete mix 8-10:1.
We still have some leftover screed at our place. I believe it’s 0-8mm (0-0.3 inches).
A friend advised me not to skimp on concrete and not to create a wedge. Rather, more like in my attached picture. This way, the curb can better handle lateral loads. Approximately 0.14 cubic meters (5 cubic feet) of concrete per meter (3.3 feet). However, I’m not sure if that might be overdoing it—maybe appropriate for paths that will be driven on?
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