Posi joist masonry infill?

[BadgerBadger]

We've just laid out all our posi joists on our masonry build.  There are multiple spans which land on internal masonry load-bearing walls.  The mitek details specify the gaps between joist bearings should be infilled with masonry to the underside of the floor for lateral restraint, all self-explanatory.

 

But, should I be building up all the other internal wall masonry to the underside of the floor deck, or leaving them down at the bottom of joist / ceiling level?

[nod]

You should build them up 

Leaving one clear in each room 

(If possible) for services to pass through