40 Hour Property and Building Inspection Practice Test

Why might gravel be used on built-up roofs?

1. To improve aesthetics

2. To provide insulation

3. To protect the membrane

4. To enhance durability

The correct answer is: To protect the membrane

Gravel is used on built-up roofs primarily to protect the membrane. The membrane is a critical component of the roof system, as it serves as a waterproof barrier. By adding a layer of gravel on top, it helps shield the membrane from several potential hazards. First, the gravel acts as a barrier against physical impacts that could puncture or damage the membrane, such as debris or hail. Additionally, it helps protect against UV radiation from the sun, which can degrade many roofing materials over time. The gravel layer also aids in preventing weather-related damage, as it can reduce the risk of wind uplift and protect against thermal cycling. Overall, the addition of gravel is key in extending the life of the roof by safeguarding the underlying materials. Factors like aesthetics, insulation, and durability, while important, are secondary to the primary function of protection that gravel provides on built-up roofs.