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Unread 10-03-2016, 10:49
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Re: Bumper rules clarification

Quote:
Originally Posted by serenagh View Post
Clarifying question on "backed by" - must all (5") of bumper plywood be touching metal structural elements? Would a 1" rim be enough? In the diagrams, it doesn't seem like there are continuous metal pieces on the frame, and the frame perimeter is also defined by an upward projection).
There is no specified minimum. So theoretically it could be a knife edge. But it needs to be "robust" which is a judgment call. We routinely use 1" box channel for our frame perimeter. That has never been questioned.

There is also a 1/2" minimum on the corners. Once again that is linear and an area.

As others have said: It to your advantage to make sure your bumpers are roboust.
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