When cutting large holes into a joist for plumbing, where should these holes be positioned?

When cutting large holes into a joist for plumbing, positioning these holes approximately in the middle is important for maintaining the structural integrity of the joist. The middle section of the joist is where it experiences the least amount of shear force and bending moment during load-bearing activities.

By locating the holes at this position, you minimize the risk of compromising the strength of the joist. Cutting too close to the ends could disrupt the joist's ability to carry loads effectively, while holes in the top third might interfere with the joist’s natural bending response, increasing the potential for structural failure under load.

Therefore, placing holes in the middle is a best practice to ensure that the joist remains strong and safe, adequately supporting the overall structure while allowing for necessary plumbing installations.