Summary: Looking for advice on allowed cantilever length for a multiply-supported joist.
The typical / simple case is shown in the first diagram. The cantilever can't exceed 1/4th of the joist span:
I'm looking for advice on interpreting this rule in the situation where the joist runs of a series of intermediate supports. I've hacked up their diagram to illustrate this:
So in this drawing the the joist is continuous for distance L which could be potentially much longer than what would be feasible in the first diagram. And though this diagram only shows one intermediate support 'B' but you could imagine there being several.
But is the 'L' in the second diagram accurate? (Allowed?)
My assumption here is that one reason for the L/4 rule is to prevent a 'seesaw' effect. So using intermediate supports to increase L would still prevent this. But there could be other considerations I'm not thinking of...
(Note - I'm aware that the local code official will have their own point of view.)