Residential Building Inspector Practice Exam

What is the minimum size for access openings to under-floor spaces located in a floor?

1. 16 inches by 20 inches

2. 18 inches by 24 inches

3. 24 inches by 30 inches

4. 12 inches by 16 inches

The correct answer is: 18 inches by 24 inches

The minimum size for access openings to under-floor spaces is determined by the necessity for safe and effective inspection and maintenance. An opening of 18 inches by 24 inches strikes a balance between accessibility and the constraints of structural integrity, ensuring that a person can safely enter and perform necessary inspections or repairs in under-floor areas. Access points that are too small could hinder inspection activities, making them impractical or unsafe. By specifying a minimum size of 18 inches by 24 inches, building codes and standards recognize the need for adequate space for an individual, tools, and any equipment that may be required during work in these spaces. This dimension is generally considered a safe and reasonable size for most individuals to navigate without difficulty. Other choices may not provide sufficient access or safety according to established building codes. Smaller options could lead to challenges in accessing certain areas, compromising the ability to perform necessary inspections or repairs. Thus, the 18 inches by 24 inches standard promotes both safety and practicality in residential building practices.