Context: Mastic asphalt is a type of asphalt which differs from dense graded asphalt (asphalt concrete) in that it has a higher asphalt/bitumen (binder) content, usually around 7–10% of the whole aggregate mix, as opposed to rolled asphalt concrete, which has only around 5% added asphalt/bitumen. This thermoplastic substance is widely used in the building industry for waterproofing flat roofs and tanking underground. 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.

Question: What is the percentage of binder in mastic asphalt?
Answer: 7–10%

Question: How much additional binder does rolled asphalt concrete have?
Answer: 5%

Question: How is asphalt used in the construction industry?
Answer: waterproofing

Question: Prior to spreading, how hot is mastic asphalt heated?
Answer: 210 °C

Question: What is the usual thickness of the mastic spread on roofs?
Answer: 20 millimeters

Question: What percentage of concrete is in mastic asphalt?
Answer: Unanswerable

Question: What is a type of impervious barrier that differs from dense graded asphalt?
Answer: Unanswerable

Question: Mastic asphalt is the same as dense graded asphalt because why?
Answer: Unanswerable

Question: Rolled asphalt concrete has contains around 7% what?
Answer: Unanswerable

Question: What is widely used in buildings for making asphalt waterproof?
Answer: Unanswerable