Bob and general contractor Ron Gan go into a former bedroom, which is being converted into the kitchen. An existing large window is being bricked up with salvaged original bricks to provide new wall space on which to hang cabinets. Ron explains that though there are three courses of brick in the original wall, it is only necessary to replace one since the header for the window is still in place. The brick is being installed with toothing in three places to join it to the existing wall. More toothing is unnecessary because the window faces a narrow gangway in between houses that had been used only for light and ventilation. Ron explains that he will next insulate the cavity and attach drywall to the metal studs all the way across the wall and then hang the cabinets. In the bathroom on the other side of the house, Bob and Gan look at another window that has been filled in to allow room for a shower. A high opening has been left for a smaller bathroom window and the brick is toothed every third course. This wall is more exposed on the outside and hence the toothing is more important to maintain the look of the original exterior wall. Next Mohammed installs the new window. A framed casement is already in the window and Mohammed uses long finish screws to screw the window in through the jamb and into the framing. Finally insulation will be added and the window will be caulked around the outside for a weathertight seal.