I am building a side extension which abutts an existing outside wall. The corner of the existing house therefore will bridge the cavity and I will have to cut through the brick and insert a physical vertical DPC to stop the rain penetrating across the brick and onto what will become an inside wall.
The problem is that at one end I also have an abutted garage that will form the new outerskin on a new cavity wall. I am unable to get a masonary cutting tool in to the corner because of the amount of space available given that the outer skin already exists.
I am thinking of inserting a chemical DPC up the wall at this point instead. It would also have the benefit of maintain the structural integrity of the old outer skin. However it would still leave a cold bridge.
The questions are, is it acceptable to create a vertical chemical DPC? If so what system would people recomend and can anyone think of any alternative approaches?