Lumber storage- vertical or horizontal?

[Brian Tymchak]

Matt, why the plywood sheet on bottom? About to start fitting out shop and just curious.

Being an old thread, Matt may or may not reply. But my guess is the plywood on the ground is somewhat of a moisture barrier, as that looks to be bare concrete. End grain on concrete can wick moisture from the concrete.

[Darcy Warner]

I bunks get stacked as high as I can stack them.
I have a cantilever two sided rack for small/short run stuff to go on. My culls, rips, small quantity left overs gets stored vertically. Once every 3 months I toss the junk.

[Jim Becker]

Being an old thread, Matt may or may not reply. But my guess is the plywood on the ground is somewhat of a moisture barrier, as that looks to be bare concrete. End grain on concrete can wick moisture from the concrete.

That's correct. It separates the material from the floor but it also (should) have an angle complementary to the wall side structure that supports the material so that it will not slide away from the supports.