What is the recommended weight per square for crushed stone or gravel in roofing?

What is the recommended weight per square for crushed stone or gravel in roofing?

• A. 300 lb
• B. 350 lb
• C. 400 lb
• D. 450 lb

Answer: (C)

The recommended weight per square for crushed stone or gravel in roofing is typically around 400 lb. This weight is significant because it provides adequate ballast for the roofing system, helping to prevent wind uplift while also serving as a protective layer against the elements. Using a weight within the recommended range ensures that the material effectively contributes to the overall performance and durability of the roofing system. Crushed stone and gravel are used not only for their weight but also for their insulation properties and ability to promote drainage, hence their common use in certain types of flat or low-slope roof systems. A weight of 400 lb is acknowledged for having enough mass to meet these functional requirements without compromising the structural integrity of the building or leading to unnecessary stress on the roofing assembly. Therefore, when selecting a weight for crushed stone or gravel, aiming for 400 lb per square is both standard and effective in meeting industry expectations for performance in roofing applications.

The recommended weight per square for crushed stone or gravel in roofing is typically around 400 lb. This weight is significant because it provides adequate ballast for the roofing system, helping to prevent wind uplift while also serving as a protective layer against the elements.

Using a weight within the recommended range ensures that the material effectively contributes to the overall performance and durability of the roofing system. Crushed stone and gravel are used not only for their weight but also for their insulation properties and ability to promote drainage, hence their common use in certain types of flat or low-slope roof systems.

A weight of 400 lb is acknowledged for having enough mass to meet these functional requirements without compromising the structural integrity of the building or leading to unnecessary stress on the roofing assembly. Therefore, when selecting a weight for crushed stone or gravel, aiming for 400 lb per square is both standard and effective in meeting industry expectations for performance in roofing applications.