Balcony railing; problem due to holders from above

Hello,

we have a terraced house from 1966.
There is a known issue with all houses regarding the mounting of the balcony railing.
From the railing, flat metal strips lead directly above the concrete slab (and thus between the concrete slab and the tiles above) a few centimeters onto the slab and then go vertically into the concrete slab.
Over the years, this allowed more and more moisture to get between the concrete slab and tiles, which has softened everything.
We have now chipped away the tiles above and all the soft spots of the concrete slab as well.
Since then, the slab has been covered with a foil because we do not yet know exactly how to proceed so that it is also affordable.
The best, but also most expensive, would be a completely new railing with mounts from underneath attached to the concrete slab. Our neighbor did it this way, and it looks great.
Unfortunately, this is probably not a financially good option for us.
Does anyone have experience here and possibly an idea?
I would be happy to take some photos in good weather and upload them here.
Maybe there is a way to modify the existing railing accordingly or to securely seal the inflow to prevent moisture?

Thanks in advance.
Regards, Micha

From personal experience in an old building: There is no better solution than your neighbor's. Alternatively, you can remove the tiles completely, repair with screed, and lay wood-look tiles. Possibly lay the wood-look tiles on a batten.

Thank you very much for your response! Now, we will consider all of this. Regarding repairing with screed... If I apply screed over these holders, which protrude about 10 cm above the floor slab and then go vertically down into the floor slab... then water will probably get between the floor slab and the screed covering again, right? Do you have any idea regarding sealing?

There is liquid plastic, you can apply it by brushing. It seals quite well and is heat resistant. Ask at the specialty store. We additionally sealed our terrace on the garage at critical points this way and it has held for 10 years. ;)

Thank you very much for the response. That sounds very interesting and might possibly seal the water inflow around these metal brackets. I will inquire a bit more closely about this; are there specific terms for such a plastic? Great idea, thank you!

Just google liquid plastic.
We got it back then from the [Baufachhandel].