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,Ftrestopping shall be provided to cut off all <br />concealed draft openings (both vertical and horizontal), and <br />form an effective fire barrier between stories, and between a <br />top story and the roof space. It shall be used in specific <br />locations, as follows: <br /> <br /> 1. In exterior or interior stud walls, at ceilings <br /> and floor levels. <br /> <br /> 2. In all stud walls and partitions, including <br /> furred spaces, so placed that the maximum <br /> dimension of any concealed space is not over <br /> eight feet (8'). <br /> <br /> 3. In f,mrred masonry walls. <br /> <br /> Between stair stringers at least once in the <br /> middle portion of each run, at top and bottom, <br /> and between studs, along and in line with run <br /> of stair adjoining such partition. <br /> <br /> 5. Around top, bottom, sides and en~s of sliding <br /> door pockets. <br /> <br /> 6. In spaces between chimneys and wood framing, <br /> loose incombustible materials shall be placed <br /> in incombustible supports, or a metal collar <br /> tightly fitted to the chimney and nailed to the <br /> wood framing may be used. <br /> <br /> 7. Any other locations not specifically mentioned <br /> above such as holes for pipes, shafting, etc., <br /> which could afford a passage for flames. <br /> <br /> 8. In all wood stud walls where taut wire is used <br /> as a backing for plaster, two-inch (2") blocks <br /> shall be placed in such a manner that they will <br /> prevent the bending of studs. <br /> <br /> "Fire stops when of wood shall be two-inch (2") <br /> thickness. If width of opening is such that more than <br /> <br />nominal <br /> <br /> <br />