Humber/Ontario Real Estate Course 3 Exam Practice

Why would a builder include both cross bridging and solid blocking in a residential structure?

1. Strengthen the beams

2. Minimize joist twisting

3. Reduce the size of footings

4. Avoid the use of cross members between joists

5. Enhance aesthetic appeal

6. Ensure even settling

The correct answer is: Minimize joist twisting

The decision to include both cross bridging and solid blocking in a residential structure primarily addresses the issue of minimizing joist twisting. Cross bridging consists of diagonal members that connect the joists, effectively stabilizing them and helping to prevent lateral movement. This lateral stabilization is crucial because, without such support, joists can twist or warp under certain loads or in response to environmental factors such as humidity changes. Solid blocking, typically composed of solid wood, is installed between the joists and serves a similar purpose by providing additional rigidity and support. This also prevents the joists from twisting, especially when they experience stress from loads or if they are subject to any potential environmental shifts. Together, cross bridging and solid blocking create a more robust structural framework that promotes stability and reduces the likelihood of defects like twisting, which can lead to structural issues over time. This attention to ensuring that joists remain straight and properly aligned contributes significantly to the overall integrity of the building.