Florida Building Code Practice Exam

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What is the largest diameter of holes that can be bored in ceiling joists for pipes or cables, relative to the depth of the joist?

The correct answer is: 1/3

The largest diameter of holes that can be bored in ceiling joists for pipes or cables must be proportional to the depth of the joist to maintain structural integrity. According to building codes, specifically the various guidelines outlined in the Florida Building Code, a common rule of thumb is that the diameter of the hole should not exceed one-third of the joist's depth. This limitation helps prevent significant weakening of the joist, which could otherwise lead to structural failure or sagging over time. Choosing one-third as the maximum diameter ensures that the joist maintains adequate load-bearing capacity while also allowing some flexibility for the installation of mechanical systems. This practice is essential in ensuring that safety standards are met and that the structural framework of the building remains sound.