Step flashing is used along vertical joints where the roof meets a wall parallel to the sides of the roofing product. Ideally, 1 or more step shingles should be used on the top half of each row of roofing material, so that any water running over a step shingle will run onto the top of the shingle below it. Colors: Galvanized or Teritone. Size: 5 In. x 7 In. Nominal thickness: 0.012. 100-pieces per bundle.