@usardave That text book was written 20 years ago. PPA you never have to put a guy on a roof. a 4 by 4 hole in a roof was what ben franklin created. a house today needs atleast a 10 by 10 hole in it. I'm not trying to bash you or anything but look up PPA and try to get your department to use it....
At 4 seconds you can see me and 3 of my department and k9 team as you drove by. I happened to randomly see it