What is the maximum diameter of a hole that can be bored in a 2 by 10 joist, according to the code?

The maximum diameter of a hole that can be bored in a 2 by 10 joist is 3 inches, which aligns with code requirements. This specification is designed to ensure that structural integrity is maintained while allowing for the passage of plumbing, electrical, and other mechanical systems.

When boring holes in joists, it's crucial to keep the diameter within this limit to prevent weakening the joist's load-carrying capacity. A hole that is too large could significantly compromise the structural performance and safety of the joist, leading to potential failures under load. The code sets these maximum dimensions based on testing and engineering principles that quantify the effect of such modifications.

While larger diameters given in the other options might seem plausible, they exceed what has been established to ensure safety and adequate support in construction practices related to joist modifications. Understanding these limits is essential for maintaining compliance with building codes and ensuring the longevity and safety of the structure.