Hi dora_s, It looks like there are a number of different concrete pours and if you try to add new sections plus a new surface coating over everything you will quickly see cracks following join lines. The existence of a concrete render on the bricks below DPC level may mean there have been problems so be careful with final levels. The only way to avoid cracking is to break up the existing concrete and use this as a base for a new concrete surface. You should add expansion joins spaced at intervals of 25x the thickness of the concrete. Regards S
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