Which is better to use to tie cavity or multiwythe masonry walls together: truss-type or ladder-type joint reinforcement?
In general, use truss-type joint reinforcement only in walls where the facing and backup units are the same--either all clay brick or all concrete masonry. In these cases, horizontal differential movement between wythes usually isn't large. Truss-type joint reinforcement can help develop some composite action between the wythes over horizontal spans, which may be desirable. For most walls, however, ladder-type joint reinforcement is the better choice. Unlike truss-type reinforcement, ladder-type allows horizontal differential movement between wythes. In walls that combine clay brick and concrete block and in all insulated cavity walls, use ladder-type joint reinforcement to tie wythes together.