I have a property which borders a pavement/road. The pavement has recently been resurfaced with tarmac. The property is a cavity built property the exterior walls are granite split blocks. I have been tryng to locate where the water is entering. I have been repairing some of the pointing which I have found weak.. I have noticed that the new level of the tarmac is level with the horizontal joints of the block-work. I have repaired one of the joints and think that his may be the problem.
can you tell me if there is any product that I can either paint onto the joints or should I put some sort of flashing up against the property at street level so that I can form a barrier between the property and the tarmac pavement???