Florida Building Code Practice Exam

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What is the minimum net free area of attic ventilation required for a rectangular building measuring 50' long by 30' wide?

5 square feet
10 square feet
15 square feet
20 square feet

The correct answer is: 10 square feet

To determine the minimum net free area of attic ventilation required for a building, the Florida Building Code typically stipulates that there needs to be a minimum ventilation area based on the size of the attic space. The common rule is that for every 150 square feet of attic floor area, there should be at least 1 square foot of net free area for ventilation. In this case, the rectangular building measures 50 feet long by 30 feet wide, resulting in a total attic floor area of 1,500 square feet. By applying the guideline, for 1,500 square feet of attic space, the calculation would be: 1,500 square feet / 150 square feet per square foot of ventilation = 10 square feet of required net free area. This calculation aligns with the requirements outlined in the Florida Building Code, which is why the correct answer is identified as 10 square feet of net free area. It is essential to ensure that this ventilation is adequately distributed between intake and exhaust points to maintain effective airflow and prevent moisture buildup in the attic.