Some days, basic math is hard. Thank you. Closest one is 32 feet, so that'll be the one I will get.So, let me do some MATH, FOR YOU; if you have 8' ceilings on both stories, that's 16', plus 4' for the foundation and 1st floor platform, is 20', plus 1' for the 2nd floor platform, that's 21', plus 3' above the roof eve, that's 24', and because the ladder will set at an angle, and depending upon what angle you are comfortable with, 1 or 2 more feet, so that's 25' or 26'.
So just buy, or rent a 30' ladder.
See how tough that was.