North Carolina Building Contractor License Practice Exam

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What thickness must joints or spaces between the fire resistance floor assembly and the flooring be filled or fireblocked?

  1. 1 inch thick

  2. 1/2 inch thick

  3. 3/4 inch thick

  4. 1/4 inch thick

The correct answer is: 1/2 inch thick

Joints or spaces between the fire resistance floor assembly and the flooring need to be filled or fireblocked at a thickness of 1/2 inch. This requirement is established to limit the spread of fire and smoke through any gaps that could compromise the overall integrity of the fire-resistive assembly. By specifying a thickness of 1/2 inch, building codes ensure that the fireblocking material can effectively prevent flames and hot gases from passing through, thereby maintaining safety in the event of a fire. This thickness strikes a balance between adequate protection and practicality in construction practices, making it a critical aspect of fire safety in building design.

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