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3

You'd need to add substantial rigidity and strength via dowels or other means of connection. It's not a material that tolerates bending stress well. The effort to do it properly probably isn't worth the cost of a new 6' or 8' shelf board. If you were to precisely drill for say six 1/4" x 4" hardwood dowels and liberally apply wood glue to ...


2

I would not bother to try to join MDF at all in a straight line as not the strongest material around, however if in a cupboard you could support the underside with a bracket and that would work well for you so not to waste your shelves.


0

Done! Ended up building the base and two verticals with treated 2x4s, and regular 2x4s for cross-support around the fireplace. Then sandwiched-in the verticals with MDF. As you can see, I also used big L-brackets to support the long horizontals. Likely a bit overboard there, but I think they'll look okay once it's filled. Was hoping for a long, open spans ...


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