davidc Posted July 26, 2020 Share Posted July 26, 2020 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 ? Link to comment Share on other sites More sharing options...
PeterW Posted July 26, 2020 Share Posted July 26, 2020 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 Link to comment Share on other sites More sharing options...
ProDave Posted July 26, 2020 Share Posted July 26, 2020 Mine all came with a solid block of wood already inserted between the upper and lower chords at load bearing points. Link to comment Share on other sites More sharing options...
jamieled Posted July 26, 2020 Share Posted July 26, 2020 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. Link to comment Share on other sites More sharing options...
Russell griffiths Posted July 27, 2020 Share Posted July 27, 2020 My I joists came with solid timber as blocking, it’s a funny size so must be factory cut to suit the joists. Link to comment Share on other sites More sharing options...
Gone West Posted July 27, 2020 Share Posted July 27, 2020 All my portal frame I-beam corners are joined both sides with plywood plates that are glued and screwed. They are Steico I-beams. Link to comment Share on other sites More sharing options...
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