In the diagram, you find a visual example of a fire stop. How do you think that short piece of wood helps to stop a fire? 

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FIGURE 15.3 Constructions terms P O D E xz CONSTRUCTION DETAILS A CEILING JOIST. Horizontal beams supporting celling B COLLAR BEAM. A beam that connects opposite rafters above the floor C CRIPPLES. Short vertical piece 2 x 4 above or below an opening D DIAGONAL BRACE. A brace across corner of structure to prevent swaying E FIRE STOP. Short board or wall between studs to prevent fire spreading F FLASHING. Metal sheet usually around chimney to prevent water seepage G FLOOR JOIST. Horizontal beams supporting floor H FOOTING. Base or bottom of a foundation wall I FOUNDATION. The supporting portion of structure resting on footing J LINTEL, A horizontal board over a door or window, also called header K MUDSILL. Perimeter board anchored directly to foundation L RAFTERS. Boards designed to support roof loads M RIDGE BOARD. Highest board in the house supporting upper ends N SOLE PLATE. Usually 2 x 4 on which wall and studs rest O STUDS. Vertical boards 2 x 4 supporting the walls every 16" (on center) P TOP PLATE. A horizontal board fastened to upper end of studs Other Construction Terms Board Foot used to measure lumber, contains 144 cubic inches R-VALUE= ranking of insulation materials EER- Energy Efficiency Rating FIGURE 15.3 Constructions terms P O D E xz CONSTRUCTION DETAILS A CEILING JOIST. Horizontal beams supporting celling B COLLAR BEAM. A beam that connects opposite rafters above the floor C CRIPPLES. Short vertical piece 2 x 4 above or below an opening D DIAGONAL BRACE. A brace across corner of structure to prevent swaying E FIRE STOP. Short board or wall between studs to prevent fire spreading F FLASHING. Metal sheet usually around chimney to prevent water seepage G FLOOR JOIST. Horizontal beams supporting floor H FOOTING. Base or bottom of a foundation wall I FOUNDATION. The supporting portion of structure resting on footing J LINTEL, A horizontal board over a door or window, also called header K MUDSILL. Perimeter board anchored directly to foundation L RAFTERS. Boards designed to support roof loads M RIDGE BOARD. Highest board in the house supporting upper ends N SOLE PLATE. Usually 2 x 4 on which wall and studs rest O STUDS. Vertical boards 2 x 4 supporting the walls every 16" (on center) P TOP PLATE. A horizontal board fastened to upper end of studs Other Construction Terms Board Foot used to measure lumber, contains 144 cubic inches R-VALUE= ranking of insulation materials EER- Energy Efficiency Rating

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The diagram youve shown is a crosssection of a building that illustrates various construction terms ... View the full answer