Advantages of Precast Stairs and Landings Industry Leaders We Work With Building Systems Types of Stairs JJ Hook Barrier Traffic Safety Products Other Precast Products Quality Request a Sample Installing a Stair Galleries Links	Flag Stair   J and L shaped Stairs. These stairs include full width integral landings. Only two are required per level. Increase appearance and no maintenance, They avoid a joint in the landing. They use end of side wall support.