We have some damp on the inside of an external wall near the front door. On the other side (exterior side) of the wall, there is a 3 inch gap in the ground around the base of the wall which appears to be filled with sand. I think this is where some of the damp is getting in to the house. I am thinking of filling this with concrete, but have read that this will stop the area of wall from 'breathing' and letting moisture out. In which case what do I fill this gap with?
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