3-31. Materials. The most common flashing materials are copper, lead, aluminum, and bituminous
roofing paper (paper that has been coated with asphalt or a similar water-resistant substance).
3-32. Installation. Spread a 1/2-inch-thick bed of mortar on top of the brick and push the flashing
firmly into the mortar. Place the brick or sill that goes over the flashing into a l/2-inch-thick bed of
mortar spread on the flashing itself (Figure 3-33). Turn up the edges of the flashing to prevent drainage
into the wall. Fit the upper end of the flashing into the groove of the raggle block and caulk it (Figure 3-
Figure 3-34. Flashing at the intersection of the wall and the roof