Directly something on top of that... do people do that? I would think of a battens as a support for decking boards or those holders that hold panels at different heights.
Due to the "Waves," rainwater naturally also remains there, but so far everything is watertight. As mentioned, previously there were simply exposed aggregate concrete slabs laid on these flat plate supports. Probably years, if not even decades...
We have found beautiful porcelain stoneware. However, it is "only" 8mm thick. Would this be sufficient to lay the tiles on pedestals without the tiles breaking when walked on?
I can't imagine it, it might hold initially with careful walking. But certainly not in the long run. You would have to place a lot of pedestals, and even then a dropped glass bottle could quickly cause breakage. I would only lay porcelain stoneware in 8mm thickness on a solid surface.
There are probably ceramic tiles that can be laid on pedestals with 2cm thickness, but 8mm porcelain stoneware is likely too thin.
I should have just left the exposed concrete slabs lying there
That's true, the 8mm also seems too little for the load.
On top of that, the stupid roof or the welding membranes don't really have a slope and rainwater collects in between (that is, in the waves). There doesn't seem to be a leveling compound for welding membranes either... hrhr
Again me. We have now decided on WPC decking boards. The boards including the substructure have already been ordered. Now I have the following question:
I want / have to place the substructure on pedestal supports. Since I do not want to screw the supports through the waterproofing membranes (leakage), I will glue them with bitumen adhesive.
The boards are to be raised by a total of 12cm. Now I have to create a slope (since the garage roof does not allow the rainwater to drain completely). A 2% slope means that I need pedestal supports about 7cm high at the house and about 1cm high at the end of the roof.
Should I now order the corresponding number of pedestal supports in different heights? I have seen during my search that there are also "slope compensation discs" for the supports... do I need these as well? Or what is the purpose of these discs?