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I am planning to have my house repointed as very often that causes the damp, I will remove the mortar and then have Bricklayer to point it for me. Apparently if you repoint with lime is better than cement. Maybe something to look into too. But definitely it should be around 10cm of loose shingle around the house not patio slabs layed all the way to the property. Good luck. Depending on how hard the concrete is SDS drill is good but very hard work.