Christopher Nelson wrote:
I have two fairly short stories in a split level house. The highest
gutters are approximately 15' above ground level. I know the 4:1 rule
for putting up an extension ladder but I'm not sure how much of a 20'
extension ladder is lost to the overlap. Is a 20' ladder enough to
reach eaves or do I need a 22'?

You can figure 3 feet of overlap between sections for the lengths you're
considering, so a 24' ladder will be 21'. If you want to get on the
roof, you'll want a ladder that reaches a couple of feet higher than the
roof line.

Your choices may be limited to 20' or 24' -- I don't recall seeing any
22' extension ladders in stores.