One of the things I learned recently, was why the bricklayers did not entirely fill in the grout joint when laying the bricks for the walls; it’s to leave a space or crevice so the repello will find its way into the wall for stronger adhesion. Repello is the coating of cement (stucco) that is applied to finish the walls. This is usually done in two stages, the “scratch” stage and the “finish” stage. You can see in one of the photos the hallway leading to the kitchen downstairs has one of the workers spreading the repello on to the walls. In order to insure the correct depth and plumb for the application of the repello, they have a piece of 1×4 attached to the wall and a string that’s used to keep everything straight.