"Christopher Nelson" wrote in message
...
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'?

A 20' will extend to 17'