NCIDQ IDFX Practice Exam

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What is the typical stud spacing for wood construction in residential buildings?

12 inches on center
16 inches on center
24 inches on center
30 inches on center

The correct answer is: 16 inches on center

The typical stud spacing for wood construction in residential buildings is 16 inches on center. This spacing is widely used because it provides a good balance between structural integrity and cost efficiency. It allows for adequate support for wall coverings, insulation, and fixtures, while also making installation manageable for builders. Studs spaced 16 inches on center ensure proper support for the drywall and any additional finishes applied to walls. This dimension also aligns with the standard size of drywall sheets, which are typically 4 feet wide, allowing for easy installation and minimal waste. While some instances may call for 24 inches on center in certain applications, particularly in non-load bearing walls or high-efficiency homes, 16 inches remains the most common practice in residential construction for load-bearing walls. Recognizing the standard helps designers and builders maintain structural performance and comply with building codes, further solidifying 16 inches on center as the widely accepted practice in the industry.