Here are some photos. The first photo is taken from the inside of my garage. The DPC can be seen where the bricks change colour and the failed mortar is shown as powder on the floor. I have not 'raked' out the mortar; it falls out itself and I periodically sweep it up. The two small/circular...
Thanks both. It's a 1967 wall and assumed sand/cement mortar, probably with a small cavity, although hard to tell. Could well be to do with the concrete floor not having a membrane and abutting the bricks, therefore creating a 'bridge', although the concrete floor itself does not seem damp...
My garage wall is shared with next door neighbour's house. My side is exposed bricks with concrete floor; there is clearly a traditional bitumen DPC (the long strip type) in the brickwork about 3 courses up from the floor and it is working - bricks above DPC are bone dry. Alas, the ~ 3 courses...