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.
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Stefan001
16 Aug 2021 08:14
The required thickness applies only if you are considering an unbonded installation. It is possible to install 1cm (0.4 inches) tiles, but then it must be a bonded installation and not on loose gravel.
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HarvSpec
23 Aug 2021 11:42
There is also a middle ground: semi-bonded with a drainage joint. Search for Sopro Solitär (F20), which includes an example video. Here, too, a tile thickness of more than 2cm (0.8 inches) is recommended.
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immermehr
10 Oct 2021 19:58
Hello everyone,
my terrace was installed last week:
- 2cm (0.8 inches) porcelain stoneware tiles, 60cm x 60cm (24 inches x 24 inches)
- laid loosely on decorative gravel
- with 3mm (0.1 inches) spacers
Question: how did you handle jointing?

The landscaper said that no joints are necessary:
- no noise is produced
- if dirt gets on it later during barbecues, it can be cleaned easily

What do you think?
THANK YOU for your answers.
tomtom7910 Oct 2021 20:02
I don’t have any joints either, so right now, if my girls keep going like this, I’ll have sand everywhere 🙂
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Basti-ac
10 Oct 2021 20:02
And how are the tiles then protected against slipping and such? We were recommended a two-component tile adhesive as grout.
tomtom7910 Oct 2021 21:09
With the crushed stone bearing bed, they look like joint crosses with a plate underneath.