Web infill blocking for I Joists for load bearing points

[davidc]

I had thought OSB was commonly used for this but is that true ? I have seen ply also mentioned  - so what determines which should be used ?

[PeterW]

Depends on the web material and the MIs. Some say use OSB as their webs are OSB, others say ply. Some say to glue and screw both sides, others say glue and nail. 
 

It is a case of RTM

[ProDave]

Mine all came with a solid block of wood already inserted between the upper and lower chords at load bearing points.

[jamieled]

James Jones have a good technical guide which answers this, available somewhere online as a pdf or from them in hard copy.

From memory single JJI's were spec'd with osb as additional infill, doubles (for cripple studs etc) specified solid timber.

[Russell griffiths]

My I joists came with solid timber as blocking, it’s a funny size so must be factory cut to suit the joists. 

[Gone West]

All my portal frame I-beam corners are joined both sides with plywood plates that are glued and screwed. They are Steico I-beams.