Which of the following is NOT a benefit of using gravel ballast on a roof?

Using gravel ballast on a roof provides several benefits that are significant for the longevity and performance of the roofing system. One primary benefit is enhanced UV protection; the gravel acts as a shield against ultraviolet rays, which can degrade roofing materials over time. Additionally, a gravel ballast increases the roof's life by reducing temperature fluctuations and protecting the underlying materials from harsh weather conditions.

Noise reduction is another advantage, as the gravel can absorb and dampen sound, creating a quieter environment inside the building.

On the other hand, the assertion regarding weight reduction is not accurate. Gravel ballast actually adds weight to the roofing system rather than reducing it. The additional weight helps hold down the roofing membrane, which can improve its performance by preventing wind uplift and damage. Therefore, the idea that gravel ballast serves to lighten the roof is not a benefit associated with its use; instead, it contributes to increased weight and stability.