ᐅ Preparing the surface for the installation of polygonal slabs
Created on: 22 Jul 2023 10:54
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Micatone1411M
Micatone141122 Jul 2023 10:54Good morning everyone,
We are currently redesigning the garden following the renovation of an old building. Next to the garage, we plan to build a shaded 18 m² (194 ft²) terrace and lay polygonal slabs on a mortar bed as the surface (originally, wood was planned).
The area has been prepared accordingly. The special aspect is that on about 12 m² (129 ft²) there is an old concrete slab approximately 3 cm (1¼ inches) thick, so there is an impermeable surface there. The rest of the area has already been prepared with excavation and compacted gravel.
The question now is whether I need to remove the concrete slab before laying the slabs or if I can simply place about 5–6 cm (2–2½ inches) of gravel on top of it (this 5–6 cm is necessary for the terrace height). In particular, I am wondering whether a 5–6 cm gravel layer adequately addresses frost protection.
I look forward to your feedback!
Best of luck
Michael
We are currently redesigning the garden following the renovation of an old building. Next to the garage, we plan to build a shaded 18 m² (194 ft²) terrace and lay polygonal slabs on a mortar bed as the surface (originally, wood was planned).
The area has been prepared accordingly. The special aspect is that on about 12 m² (129 ft²) there is an old concrete slab approximately 3 cm (1¼ inches) thick, so there is an impermeable surface there. The rest of the area has already been prepared with excavation and compacted gravel.
The question now is whether I need to remove the concrete slab before laying the slabs or if I can simply place about 5–6 cm (2–2½ inches) of gravel on top of it (this 5–6 cm is necessary for the terrace height). In particular, I am wondering whether a 5–6 cm gravel layer adequately addresses frost protection.
I look forward to your feedback!
Best of luck
Michael
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WilderSueden23 Jul 2023 14:51What is the planned structure? Permeable or waterproof?
If it is permeably sealed and uses drain concrete, the slab must be removed. Otherwise, water will accumulate in the 5cm (2 inches) layer of gravel. This is problematic even in summer, and in winter it will cause everything to crack due to freezing.
If it is permeably sealed and uses drain concrete, the slab must be removed. Otherwise, water will accumulate in the 5cm (2 inches) layer of gravel. This is problematic even in summer, and in winter it will cause everything to crack due to freezing.
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