Inside Step Void

[Bangorbob]

Need some advice. My first step inside my RV was squeaking. Took it apart and kinda figured I would find what I did in the picture, only not quite that bad. Poor design (my opinion only). The question is: would you fill the void (red scribbling) in pic, with low expanding foam. I did put 1 more piece of wood and screwed the step back in pretty good. It is solid and doesn't squeak anymore.

Thanks, Bob

[BFlinn181]

I'd guess the photo is of the underside of a step insert. What does the insert sit on? If it's a solid surface, I'd add more wood strips of proper size to shim the whole step. Foam will compress and if any movement is possible, it will squeak.

[Dutch Star Don]

Cut out a solid piece of wood that fills the entire void. You may have to buy a couple difference thicknesses of plywood, but it would then be solid with nothing moving around or squeaking.