Estimating Practice Exam

When measuring ridge blocking, what must be included in the measurement?

1. The ridge of the trusses plus the width of the overhang outside of the gables

2. Only the length of the ridge

3. Only the width of the gables

4. Distance from foundation to roof

The correct answer is: The ridge of the trusses plus the width of the overhang outside of the gables

In measuring ridge blocking, it is crucial to include the entire span that the ridge blocking will support. This means that not only should the length of the ridge of the trusses be measured, but you should also factor in the width of the overhang outside of the gables. The inclusion of the overhang is important because it affects the overall structure and distribution of weight on the ridge, ensuring that the blocking can adequately support the roof in its entirety. It contributes to the stability of the building by providing continuity in the structural elements along the entire ridge line, from one end of the roof to the other, including any extensions from the gables. Measuring only the length of the ridge, the width of the gables, or the distance from the foundation to the roof would omit critical dimensions that are necessary for a comprehensive and accurate measurement of ridge blocking. This would ultimately result in insufficient support and could lead to structural weakness in the roof system.