Why is it important for mineral wool fibers to be oriented horizontally?

The orientation of mineral wool fibers is crucial, particularly for ensuring effective smoke control and maintaining structural integrity in various applications. When fibers are oriented horizontally, they can create a more cohesive structure that can resist the passage of smoke and heat. This horizontal alignment allows the product to better implement fire barriers and helps to contain smoke and toxic gases in the event of a fire. The structural integrity is also enhanced as horizontal fibers can resist sagging and maintain their performance over time, contributing to the safety and effectiveness of the building materials used.

Other options, while they touch on important considerations, do not directly address the primary reasons for the fiber orientation. For instance, while moisture control and sound absorption are relevant attributes of mineral wool, they are not as critically tied to fiber orientation as structural integrity and smoke control. Similarly, the ease of installation is a factor but does not capture the essential fire safety and performance benefits that come with horizontal fiber alignment.