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The, ahem, "local" fix, is to get glass fibre matting, and set that down with the really heavy duty roof paint which also contains fibre strands. You can buy all this at Leroy Merlin, or other appropriate store. This might do as a quick and dirty fix, but can get very expensive if you do the whole area.
Likewise, the heavy duty roof paint, guaranteed waterproof (if it's 1mm thick), is a quick and easy fix, but also pricey for the whole terrace. Worth looking into. And you'd still have to clean the terrace floor, which may start pulling up the old grout - sorry, just thinking aloud now.
stevep
skinny
Thanks.
Given the issue is water leaking in below the terrace I won't be adding more water. But appreciate the tips.