JJI-Joists are ideally suited for use as wall studs where their availability in depths up to 450mm allows designers to insulate external walls to unprecedented levels. Even when shallower joists are used the narrow web profile provides a restricted path to heat transfer (reduced repeated thermal bridging) when compared with solid timber.
James Jones & Sons recommend that JJI-Joists are incorporated into prefabricated wall panels in order to take advantage of the improved precision and quality typically available in a factory environment.
The structural design of JJI-Joist studs should be undertaken by a suitably qualified Engineer who should pay particular attention to buckling restraint, axial load distribution between inner and outer flanges and member to member fixings.
Download JJI-Studs Flyer (PDF 461 KB)