TJI running parallel to wall

[palk7 EIT]

Hi,

When the floor joists run parallel to the wall, blockings are installed between the rim joist & 1st interior joist. In a case where the wall is going to pick up a certain amount of load the from above does this blocking help in transferring the vertical loads down to the top plates of the wall below (the reason I ask is the blocking sits on to of the top plate but its connection to the interior first joist is just nailing).
In general, are these blockings provided to prevent lateral rollover of the rim joist at the end? and also it helps to transfer vertical loads from the wall above?. If this blocking doesn't help much in transferring the vertical loads, is it common to provide cripple studs every 16" in that rim space?

In short:
Rim + Blocking - Interior first joist
or
Rim + Cripple studs + Blocking - Interior first joist

Thank you!

 

[KootK]

Current, related thread: Link

In a case where the wall is going to pick up a certain amount of load the from above does this blocking help in transferring the vertical loads down to the top plates of the wall below

Sort of. See the sketch below.

In general, are these blockings provided to prevent lateral rollover of the rim joist at the end? and also it helps to transfer vertical loads from the wall above?

Yes and yes... sort of.

If this blocking doesn't help much in transferring the vertical loads, is it common to provide cripple studs every 16" in that rim space?

In my experience, that is very uncommon and cripples of that sort are only used at heavier post loads.

 

[KootK]

 

[palk7 EIT]

Thank you KootK