ᐅ Patio: Laying Tiles on Crushed Stone Base

Created on: 10 Aug 2021 08:27
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XAMMAX2
Dear Ladies and Gentlemen,
Dear forum members,

The house construction is progressing, and I now need to start thinking about the terrace.
It will be a corner terrace (south-west facing) of about 90 sqm (970 sq ft).
The house description (scope of work) includes a gravel base with Jura gravel that ends approximately 20 cm (8 inches) below the finished terrace height, providing the option to add crushed stone or similar material.
I would like to install 90 x 90 cm (35 x 35 inches) R11 tiles with a thickness of 2 cm (0.8 inches).
Is it possible to lay them on crushed stone, and do I need so-called spacers or pedestals?
Thank you very much.
D
driver55
10 Oct 2021 21:48
So, joints are present everywhere. However, some are "open," while others are "filled."

In our case, the slabs laid on a gravel bed have had open joints since 2013.
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fach1werk
10 Oct 2021 21:51
Our terrace has decorative gravel beneath the surface layer. It would be questionable whether I wanted the top layer to be installed directly on a bed of gravel that would crunch.
We used spacer crosses, and the narrow joints were filled with very fine gravel, not sand. Our surface consists of natural stone slabs. However, smaller concrete pavers with sand-filled joints were used in the driveway. The joints were not technically necessary; they are there solely because infiltration capacity was required.
The very fine gravel locks in well, preventing ants from entering. The stones stay firmly in place.
The sand in the concrete paver joints tends to develop moss, ants carry it away, and I have to do maintenance from time to time.