Shelves - bark side up?

[identity_crisis]

It’s kind of too late now since the deeds been done already but when doing fixed shelves housed in dadoes - does it matter bark side up or down? I did bark side up so the convex is topside / i figured due to the weight of books it would push it down and keep it flat over time Shelves are about 10 inches deep and 37” wide - 1/4” dadoes

This is for future knowledge and next project...

[Rob Young]

Trapped in a dado, probably doesn't matter.

Resting on shelf pins do bark side up, yes. But my preference in that case would be plywood with edge and.

[identity_crisis]

Thanks Rob

I seem to never get straight the whole cupping issue.

[Rob Young]

Thanks Rob

I seem to never get straight the whole cupping issue

The more I think about a shelf pin supported shelf, I think it would depend on the load like you described.  Bark side up, the edges will curl up but enough weight of books may prevent much movement. 
As a table top, heart side up definately.

[identity_crisis]

I’m not gonna sweat it now - it’s gonna do what it’s gonna do
since it’s already in. But I’ll definitely set it right next project