Arizona Plumbing Practice Exam 2025 – Complete Preparation Guide

The maximum diameter of a hole that may be bored in a 2 x 10 joist is 3 inches. This specification is established by building codes to ensure the structural integrity of the joists while allowing for necessary plumbing, electrical, and other utility installations.

Boring a hole allows for passage of various systems without compromising the strength of the joist. The size limitation is important; if the hole is too large, it could weaken the joist and lead to structural failure. Codes are designed to protect against such risks by setting parameters based on the joist size. For a 2 x 10 joist, a 3-inch hole strikes a balance between functionality and the structural capacity of the material.

Understanding these limits helps plumbers and builders comply with safety standards and maintain the longevity of the building's structural framework.