When it starts to sag it's too long?
Really now. You haven't said how thick you were thinking of making the
shelves. You haven't said what you might make them out of. You haven't said
what type of shelf construction you have in mind and you haven't said what
you might be putting on these shelves.
How do you expect anyone to answer your question?
You're exactly right on all accounts! I was thinking of 3/4" thick
material made from alder. The shelves will me held up by the little
adjustable thingees that fit into the holes drilled into the side
panels. I'll be putting anything from office supplies to books on the
I hope noe somebody can give me an answer. :)
The longer the shelf, the more the sag.
But you probably figured that out for yourself!
I don't like to make shelves longer than 30 inches or so out
of anything. If I have to go longer than that, then I like to
put a horizontal support under the front edge, or add another
vertical stile. You could also increase the thickness of the
shelf, but that may not be practical, although a 3/4" shelf
with a horizontal stiffener looks like a thicker shelf.
you can stiffen a shelf in a number of ways.
reduce length and or increase thickness
secure along the back edge
include a "stiffener" --front edge trim thicker than the shelf itself
gluing it into a dado on back edge and sides will increase it's load
carry capacity over a "loose" shelf
species of wood matters. MDF, ply, solid wood all have different sag
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