hi, ive identified the problem, so ive hacked off internal render 3ft from the floor, ground level outside too high and a clown before me tried close a hole in wall(below dpc) from a service with expanding foam,this is the main cause of the render perishing inside, now, ive got to re render to match the wall, im currently letting the brickwork dry out inside and out, its only one skin, so my plan was to fill hole correctly, 2 x blackjack the infected area(bottom 6 inches) in one main area, then re render to suit, however in places the render was only a few mil(no finish coat on wall)thick, so is not a great depth, brickwork is dry and sound apart from the local area of prroblem, how long am i gonna get out of this work assuming the wall is remedied of damp, ive explained to customer that there are better ways of approaching this, but they require much more money, anyone got any tips on what i can do apart from the above to do the soundest job possible without the customer spending fortunes( ive also told them the need to have a window put in this kitchen extension), it doesnt have one, you can imagine the condensation and lack if ventilation 
