Hello everyone.
We want to renovate our terrace. Currently, there are slabs installed that are 4/5 cm (1.5/2 inches) thick. These are firmly glued onto a concrete foundation. Everything is very solid. So far, the terrace is stable—no sinking, no loose parts, etc. However, we no longer like the surface, so it needs to be replaced. At first, we thought about simply gluing a new surface on top. Two landscapers told us over the phone that this is not possible. The old slabs need to be removed. Then a third landscaper visited and said that it is possible. He offered us 2 cm (0.8 inch) thick ceramic tiles. Beforehand, everything would be primed. We are now unsure whether this really works and will hold reliably. What do the experts here think? Would it be possible to glue over the old surface?
Thanks in advance.
We want to renovate our terrace. Currently, there are slabs installed that are 4/5 cm (1.5/2 inches) thick. These are firmly glued onto a concrete foundation. Everything is very solid. So far, the terrace is stable—no sinking, no loose parts, etc. However, we no longer like the surface, so it needs to be replaced. At first, we thought about simply gluing a new surface on top. Two landscapers told us over the phone that this is not possible. The old slabs need to be removed. Then a third landscaper visited and said that it is possible. He offered us 2 cm (0.8 inch) thick ceramic tiles. Beforehand, everything would be primed. We are now unsure whether this really works and will hold reliably. What do the experts here think? Would it be possible to glue over the old surface?
Thanks in advance.
Hello questioner,
In short: YES, it is possible.
However, the terrace floor, as long as it is within the irrigated area, should (or must) have a slope of 2%, away from the house wall.
I see two options for “improving” the terrace surface:
1.) Installing new tiles by bonding them, or
2.) Applying a decorative synthetic resin coating.
--------------
The preparation work is largely the same for both options:
The entire surface is diamond ground, then the dust is removed by vacuuming, followed by an alkaline cleaning.
Afterwards, it is neutralized with clean water and allowed to dry thoroughly.
For option (1), the dry old tile surface is primed with a synthetic resin and while still wet, broadcasted with kiln-dried quartz sand.
For option (2), the dry old tile surface is treated with a scratch filler to prevent old grout lines from showing through later.
Afterwards, either (1) a new ceramic covering is installed using the thin-bed method or (2) a UV-resistant reactive resin coating is applied with or without flake broadcast and, after curing, sealed within 24 hours.
---------------
So both options are feasible!
Regards, KlaRa
In short: YES, it is possible.
However, the terrace floor, as long as it is within the irrigated area, should (or must) have a slope of 2%, away from the house wall.
I see two options for “improving” the terrace surface:
1.) Installing new tiles by bonding them, or
2.) Applying a decorative synthetic resin coating.
--------------
The preparation work is largely the same for both options:
The entire surface is diamond ground, then the dust is removed by vacuuming, followed by an alkaline cleaning.
Afterwards, it is neutralized with clean water and allowed to dry thoroughly.
For option (1), the dry old tile surface is primed with a synthetic resin and while still wet, broadcasted with kiln-dried quartz sand.
For option (2), the dry old tile surface is treated with a scratch filler to prevent old grout lines from showing through later.
Afterwards, either (1) a new ceramic covering is installed using the thin-bed method or (2) a UV-resistant reactive resin coating is applied with or without flake broadcast and, after curing, sealed within 24 hours.
---------------
So both options are feasible!
Regards, KlaRa
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