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Does it make a difference to use osb board on the bottom of a rack, and does it make it safer? Because what I have found is that plywood and osb are pretty much identical, except one handles...

I was wondering why osb is used on the bottom part of a mortar rack and not plywood?

Mortar Racks
I am planning on building (1) 36 shot rack and (2) 6 shot racks using 12" DR11 tubes for consumer mortars. I was planning on building the racks with 1 1/2" spacers, but my concern is...