Can the fire rating be increased to an existing wall or a wall where the cmu width cannot be increased?
Under the provisions of the Uniform Building code, BOCA and the Standard Building Code, when the cells of the units are solidly filled with grout the equivalent thickness shall be considered as being the actual thickness of the unit. Filling the hollow core spaces with an approved insulation or granular material will reduce the rate of heat flow through the wall and results in an increase in fire endurance.
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