I am verifying the answers generated by an automatic system to the following question: how long is a flat membrane roof good for?
Suggested answer: As gravel cannot protect tarpaper surfaces where they rise vertically from the roof such as on parapet walls or upstands, tarpaper variants are produced with fine gravel applied to the hot tar during the process of manufacture such that a permanent layer of gravel is stuck to it in order to give it ongoing protection.
Should I validate this answer?
