This question was triggered by the following line in a home inspection:
Blocking is not installed for I joists above beams in basement.
I have found pictures of blocking at http://www.diychatroom.com/f14/sister-studs-ceiling-easy-question-11349/ (linked from Floor Joist Blocking). I have also found that cross bracing is an alternative to solid blocking. According to the National Wood Council's Details for Conventional Wood Frame Construction:
Adequately nailed subflooring will maintain the upper edges of floor joists in proper alignment. Nailing the ends of joists to band joists or headers provides additional joist support that, under normal conditions, eliminates the need for intermediate bridging.
I feel like I understand the term, and what must be done, but my wife understood the inspector to mention load distribution in relation to the supporting steel beam when he commented to her during this portion of the inspection.
Is my understanding of blocking missing something? Does the possibility of compromising the positioning or structural integrity of the steel support beam exist because there is no blocking?