ᐅ Ceramic patio slabs installed directly on pedestal supports – any experiences?
Created on: 5 Nov 2025 10:48
F
Flitz86Hello everyone,
what are your experiences with ceramic patio slabs laid directly on adjustable pedestals, without any additional substructure?
I have watched several DIY videos on this topic, and people often mention things like “a bit unstable,” “the floor gives way,” and so on.
I find it hard to imagine myself, especially since there is no proper support edge.
My balcony is roughly 7 meters (23 feet) long. I’m concerned that over this length, the pedestals might gradually shift out of alignment.
Fixing them to the surface (waterproofing layer) isn’t really an option—unless you glue them somehow.
Best regards,
Chris
what are your experiences with ceramic patio slabs laid directly on adjustable pedestals, without any additional substructure?
I have watched several DIY videos on this topic, and people often mention things like “a bit unstable,” “the floor gives way,” and so on.
I find it hard to imagine myself, especially since there is no proper support edge.
My balcony is roughly 7 meters (23 feet) long. I’m concerned that over this length, the pedestals might gradually shift out of alignment.
Fixing them to the surface (waterproofing layer) isn’t really an option—unless you glue them somehow.
Best regards,
Chris
Basically, panels with a thickness of 40-45mm (1.6-1.8 inches) or more are self-supporting and therefore suitable for pedestal constructions.
The subfloor is one of the most important factors; it should be sufficiently pressure-resistant, and any slope must not point towards the house wall (as this is the water drainage area in case of rainfall).
Surface irregularities of the subfloor can be compensated for using appropriate pedestals.
Compensating means that you always know your exact height reference point.
Ideally, panel installation is carried out using a rotary laser level to ensure that every panel is installed at the same height.
You should not save on pedestals, as they serve as the "load-bearing" components responsible for the overall surface stability later on.
Good pedestals allow each of the four corners of a panel to be individually adjusted or leveled in height.
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Good luck: KlaRa
The subfloor is one of the most important factors; it should be sufficiently pressure-resistant, and any slope must not point towards the house wall (as this is the water drainage area in case of rainfall).
Surface irregularities of the subfloor can be compensated for using appropriate pedestals.
Compensating means that you always know your exact height reference point.
Ideally, panel installation is carried out using a rotary laser level to ensure that every panel is installed at the same height.
You should not save on pedestals, as they serve as the "load-bearing" components responsible for the overall surface stability later on.
Good pedestals allow each of the four corners of a panel to be individually adjusted or leveled in height.
---------------------
Good luck: KlaRa