Residential Building Inspector Practice Exam

What is the minimum access opening required for accessing an under-floor space through a perimeter wall?

1. 14 inch by 20 inch

2. 16 inch by 24 inch

3. 18 inch by 24 inch

4. 12 inch by 18 inch

The correct answer is: 16 inch by 24 inch

The minimum access opening required for accessing an under-floor space through a perimeter wall is indeed 16 inches by 24 inches. This specification is based on standard building codes that ensure adequate access for inspection, maintenance, and repairs. The dimensions of 16 inches by 24 inches provide sufficient space for a person to enter the under-floor area safely and maneuver as needed to perform required tasks. This standard is important because under-floor spaces may contain critical components such as plumbing, electrical systems, and insulation, all of which need to be periodically inspected. Access openings that are too small can hinder maintenance efforts, create safety hazards, and prevent proper inspections, which could lead to undetected problems. Therefore, adhering to this requirement helps ensure that building systems remain functional and safe over time.