Nice idea but be careful!
As a structural engineer I would caution folks to limit storage to very lightweight items.  Joists that comprise the attic floor (the ceiling joists from below) are generally designed for minimal uniform loads.  This is especially true for roof trusses.<br /><br />While using the space is tempting, recognize that one must be cautious about the weight imposed on the joists - they may not be capable of supporting it, or they may deflect resulting in a sagging ceiling below.
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