What is the expected behavior of asphalt when temperatures rise?

When temperatures rise, asphalt exhibits an expected behavior of flowing or moving. This response to heat is due to the thermal properties of asphalt, which is a viscous material. As temperatures increase, the viscosity of asphalt decreases, allowing it to become more fluid-like. This characteristic is important in roofing applications because it helps the material to conform and bond to surfaces, fill in gaps, and seal vulnerably points against leaks.

Understanding the flow behavior of asphalt in response to temperature changes is crucial in built-up roofing systems, as it influences the material's performance in various weather conditions. The ability for asphalt to flow can help manage water drainage and reduce the risk of water pooling, while also enabling it to expand and contract with temperature fluctuations without cracking. This is why option C is the most accurate representation of asphalt behavior at elevated temperatures.