Residential Building Inspector Practice Exam

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

1. 12 inches by 18 inches

2. 14 inches by 20 inches

3. 16 inches by 24 inches

4. 18 inches by 30 inches

The correct answer is: 16 inches by 24 inches

The standard size for access openings to under-floor spaces located in a floor is typically 16 inches by 24 inches. This size is widely accepted in building codes as it provides sufficient space for inspectors and maintenance personnel to perform necessary inspections and repairs in under-floor areas. Having a standard size ensures that the access openings are large enough to allow individuals to navigate comfortably while still being manageable in terms of space and structural integrity. It balances the need for accessibility with the importance of maintaining the floor's structural components. Access openings smaller than this standard may hinder inspections or repairs, while larger openings could compromise the floor's strength and stability. It's essential to adhere to this standard to ensure safety and compliance with building codes which are designed to protect both the integrity of the structure and the safety of individuals who may need to access these spaces.