In reply to Michael Hood:
> E grade of a ladder is related to the angle it's leant against the wall. But the relationship isn't as obvious as you'd think. For arguments sake lets call the optimal leaning angle E0 (whatever that angle is). As the angle is made steeper the ladder becomes both technically harder and more precarious and hence the E grade goes up. Current limit for ladders is totally vertical and unsupported at about E7.
> However as the angle is decreased from the optimum, the risk goes up as too large an angle can lead to a ladder slipping away from the wall, but once the angle becomes very large, you're always near the ground so the risk goes down again even though the ladder is almost certain to slip. Max easy angle grade is about E3.
> Now obviously, these grades are for totally unsupported ladders on a flat concrete floor. As soon as any of several "cheats" are used the grade is affected:
> - Grass, earth, natural floor
> - Someone holding the ladder - you might as well step on their shoulders
> - Bricks stopping the base of the ladder moving, etc.
> - Angled floor - although it is possible to have an away angle that increases the grade
> Of course this is all for a "standard" length ladder that will allow people to comfortably reach gutters on the upstairs. Recently, there is a trend for people who don't like traditional ladders to only use step-ladders. These are much shorter and safer although they still allow the technical movement up ladders. The grading system detailed above is totally inappropriate for this new-fangled spinoff although some claim that step-ladders can be used for training.
> Of course there are also a few people who climb up multi-floor long ladders, and no doubt there are many variants of the ladder climbing game that I'm not yet aware of.
> Happy ladder climbing.
What about one of those multi-section ladders which is just a tad short and as such is set up with minimal overlap between the sections resulting in extra length but maximal flex? Could that, vertical and unsupported on a polished, tiled floor (the kind you can skid across in socks) merit E8?