<human>: Question: What is the usual thickness of the mastic spread on roofs?
Answer: Mastic asphalt is heated to a temperature of 210 °C (410 °F) and is spread in layers to form an impervious barrier about 20 millimeters (0.79 inches) thick.
 Is the question answered in a satisfactory fashion?

OPTIONS:
- yes
- no
<bot>: yes