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I have a concrete terrace that is cracked and below a cellar. During bad weather, there is infiltration in the cellar. What do you recommend that I do? I plan to tiled this terrace later.

On a simple concrete slab the appearance of micro cracks is not abnormal. If they are more important, have a professional check that these cracks have not weakened the slab; your safety is at stake

After cleaning and dusting the slab, install a sealing film (type ADEKARO from Siplast or various solutions from PAREX LANKO) specially designed to then receive a tiled terrace.

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