Install anti crack membrane Ditra matting, any brand would do.
https://www.tilingsuppliesdirect.co.uk/product-category/wetroom-systems/decoupling-membranes
Schluter Kerdi 200 like products are perfect for the application as long the wall is perfectly sound, make sure you apply the corner band up the wall/corner. Send us some pictures. Good luck!
It looks like that floor was designed for vinyl flooring. The green tile is vinyl. Get a dehumidifier to dry up the soil then you can proceed with the concrete and tile. Ardex products are good. As far as the bitumen blackjack goes, make sure Ardex NA is compatible with bitumen. Send some...
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