For alignment control between a roof truss and nonbearing walls; the 1 1/2" slot permits vertical truss chord movement when loads are applied. Material 18 gauge (43 mil) Finish Galvanized (G90) Installation Use all specified fasteners; see General Notes. Use STC or DTC depending on required loads. STC, installed with DS drywall stop, helps prevent fasteners tearing through the ceiling drywall (see installation illustration). Use STCT where truss or rafter is separated from the top plate of the nonbearing wall. Install slot nails in the middle of the slot. Products not intended for floor applications due to the frequency of floor joist deflections and potential for squeaks.