The Content Of The Article:

What product should I use to seal cracks (see attached photos). I enlarged these cracks that are internal with the idea of ​​putting staples... but I do not know if a fiber cement would not be enough... the slots are also visible at the bottom of the block. I had a visit from an expert who mentioned a bad build to explain these cracks.

It is certainly structural cracks, probably related to differential settlements: poorly backfilled ground, insufficient foundations, etc., or volumetric variation of a clay soil subjected to successive humidification and drying phases.
Filling these cracks with a fiber coating is not a bad idea, but these cracks will reappear if the background problem is not addressed. In the case of soil or foundation settlements, there are foundation and / or soil reinforcement systems, either by micro-pile or by resin injection.

On the same topic

  • Questions answers
    • How to replace a coating that peels off?
  • DIY tips
    • Reclaim internal moving cracks
    • Re-sealing cracks in the plaster

This may interest you

Video Instruction: Concrete Crack Repair using the Torque Lock™ Structural Crack Repair Method