Florida Building Code Practice Exam

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What is the fire rating of one layer of 5/8" type x gypsum wallboard?

15 minutes
20 minutes
30 minutes
40 minutes

The correct answer is: 40 minutes

The correct fire rating of one layer of 5/8" type X gypsum wallboard is typically 30 minutes rather than 40 minutes. This material is specifically designed to provide enhanced fire resistance compared to regular gypsum wallboard. The effectiveness of this fire-rated gypsum board is due to its unique composition, which includes fiberglass and additives that increase its performance during a fire. Fire ratings are established based on standardized testing, and for walls using a single layer of 5/8" type X wallboard, the commonly accepted rating is 30 minutes. This rating indicates how long the wallboard can withstand the passage of flames and heat, allowing for some protection during a fire event. If presented with a question regarding fire ratings and construction materials, it’s essential to understand the standard attributes of these materials and their applications in building codes to ensure safety and compliance.