Hello everyone,
Here is my third question regarding the construction of my new terrace:
Basically, I would like to install the surface with gravel, possibly partially bound, but this is not yet finalized. It is also undecided whether to use concrete slabs, porcelain stoneware, or natural stone slabs.
There is already a base slab, or it will be extended, but I plan to raise the level significantly higher than it was originally. From the top edge of the base slab to the top edge of the terrace, the height difference is about 25cm (10 inches).
Assuming I use 5cm (2 inches) thick slabs as the surface, 5cm (2 inches) of gravel, this would leave 15cm (6 inches) of crushed stone on top of the base slab.
Question 1:
Is this acceptable?
Question 2:
So far, there has been no drainage on the base slab. I also assume that the base slab itself has no slope, and I would do it the same way again (since it has been fine so far). Does it make sense to create a slope with the crushed stone first, then add drainage membrane, and finally the gravel, or is that unnecessary?
Question 3:
I would prefer to work without an edging stone; what is the best approach for this? (The base slab is 10cm (4 inches) wider than the terrace).
Thanks in advance for your input!
Here is my third question regarding the construction of my new terrace:
Basically, I would like to install the surface with gravel, possibly partially bound, but this is not yet finalized. It is also undecided whether to use concrete slabs, porcelain stoneware, or natural stone slabs.
There is already a base slab, or it will be extended, but I plan to raise the level significantly higher than it was originally. From the top edge of the base slab to the top edge of the terrace, the height difference is about 25cm (10 inches).
Assuming I use 5cm (2 inches) thick slabs as the surface, 5cm (2 inches) of gravel, this would leave 15cm (6 inches) of crushed stone on top of the base slab.
Question 1:
Is this acceptable?
Question 2:
So far, there has been no drainage on the base slab. I also assume that the base slab itself has no slope, and I would do it the same way again (since it has been fine so far). Does it make sense to create a slope with the crushed stone first, then add drainage membrane, and finally the gravel, or is that unnecessary?
Question 3:
I would prefer to work without an edging stone; what is the best approach for this? (The base slab is 10cm (4 inches) wider than the terrace).
Thanks in advance for your input!
To explain why a concrete slab is involved when you want to lay gravel:
The concrete slab was the original base for the terrace, probably installed around 40 years ago. Then paving slabs were placed on sand. In the meantime, there was a wooden deck on top. Now the plan is to have paving slabs again...
If I understand correctly, the main issue is that the concrete slab has no slope, which might cause water to pool, freeze, and lift the slabs. Nothing much worse can happen, right? Overall, surface water has been drained so far; there were no moisture problems or water coming from other areas.
What options are there to create a drainage layer (with a slope) on the slab? I have read something about screed. Are there other methods as well?
The concrete slab was the original base for the terrace, probably installed around 40 years ago. Then paving slabs were placed on sand. In the meantime, there was a wooden deck on top. Now the plan is to have paving slabs again...
If I understand correctly, the main issue is that the concrete slab has no slope, which might cause water to pool, freeze, and lift the slabs. Nothing much worse can happen, right? Overall, surface water has been drained so far; there were no moisture problems or water coming from other areas.
What options are there to create a drainage layer (with a slope) on the slab? I have read something about screed. Are there other methods as well?
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