How far from the top or bottom of a joist should notching be avoided?

Notching a joist can significantly affect the structural integrity and load-bearing capacity of the framing. Avoiding notches too close to the top or bottom of a joist is essential for maintaining strength, as these areas are critical for bearing loads and providing overall stability.

The reason for the preferred distance of 2 inches from the top or bottom of a joist is primarily based on building codes and engineering standards. Notching too close can weaken the joist, leading to potential failure under load conditions. By maintaining a distance of at least 2 inches, it ensures adequate material remains to support the structural loads, thus promoting safety and compliance with standards in construction practices. This 2-inch guideline helps prevent any undue stress concentrations and keeps the joist well within its allowable limits for both bending and shear forces.