Mark,
If you support the length of the boards top to bottom, you should have
no problem.  If, however, you just support at the top and bottom and
nothing in between, you run the risk of bowing the boards lengthwise.
Depending on length ( you said 8-10'), you might get away with
supporting midway up.  I've never been an advocate of upright storage,
but you can get away with it using just a bit of thought.  Twisting
should be no more issue than normal, regardless.

Just my opinion.
Bruce Z.



>
> I am having thoughts of building leaning racks against the out side walls to
> store the wood on end similar to what I see at lumber stores. A lot of floor
> space would be saved with this method.
>
> Is leaning/standing the boards on end a method of storage that does not
> encourage warping and twisting over time?
> Mark