Red Seal Carpenter Complete Practice Exam 2025

When installing web stiffeners in the context of I-joist structures that bear on an interior load-bearing partition, it is essential to consider the proper fit to accommodate any potential movement caused by environmental factors, such as temperature changes and moisture. The correct installation method involves having a 1/4" gap at the top chord and ensuring the web stiffener is tight to the bottom chord.

This design features a gap at the top to allow for expansion and contraction without causing structural stress to the joist or the stiffener. If the web stiffener were tight at both ends, it could lead to issues such as cracking or deformation of the joist or the stiffener itself due to lateral or vertical movements. The snug fit at the bottom chord helps to support the load effectively while allowing flexibility at the top.

Additionally, installing the stiffener this way helps maintain the integrity of the entire structure, as the upper gap provides the necessary clearance for the materials to respond to load changes without compromising their performance over time. Therefore, this method of installation yields a balance between structural stability and material longevity.