Florida Home Inspector Practice Test

What is the purpose of gravel on a built-up tar-and-gravel roof?

1. To provide insulation to the roof

2. To prevent delamination of the plys

3. To increase aesthetic value

4. To enhance drainage

The correct answer is: To prevent delamination of the plys

The purpose of gravel on a built-up tar-and-gravel roof is primarily to prevent delamination of the plys. In built-up roofing systems, multiple layers of felt and asphalt are applied to create a protective barrier. The gravel serves several essential functions, including protecting the underlying layers from UV radiation and physical damage, which could lead to delamination. It helps to weight the roofing material down, preventing wind uplift and ensuring that the tar and felt layers remain securely adhered to one another. While it can also contribute somewhat to aesthetic value and may have a minor impact on drainage, the primary benefit lies in its protective role against the elements and maintaining the structural integrity of the roofing system. Thus, the gravel is critical in preserving the longevity and effectiveness of the built-up roofing.