Figure 5-22.—Main tee suspension and steel splice.MAIN TEES.— Install maintees of 12 feet or lessby resting the ends on opposite wall angles and insertingthe suspension wires (top view of fig. 5-22). Hang onewire near the middle of the main tee, level and adjust thewire length, then secure all wires by making thenecessary turns in the wire.For main tees over 12 feet, cut them so the cross teesdo not intersect the main tee at a splice joint. Begin theinstallation by resting the cut end on the wall angle andattaching the suspension wire closest to the oppositeend. Attach the remaining suspension wires, makingsure the main tee is level before securing. The remainingtees are installed by making the necessary splices (steelsplices are shown in fig. 5-22 and those for aluminumin 5-23) and resting the end on the opposite wall angle.After the main tees are installed, leveled, and secured,install the cross tees.CROSS TEES.— Aluminum cross tees have“high” and ‘low” tab ends that provide easy positiveinstallation without tools. Installation begins by cuttingborder tees (when necessary) to fit between the firstmain tee and the wall angle. Cut off the high tab end andrest this end in the main tee slot. Repeat this procedureuntil all border tees are installed on one side of the room.Continue across the room, installing the remaining crosstees according to your grid pattern layout. An aluminumcross tee assembly is shown in figure 5-24. At theopposite wall angle, cut off the low tab of the border teeFigure 5-23.—Main tee and aluminum tee splice.Figure 5-24.—Aluminum cross tee assembly.and rest the cut end on the wall angle. If the border edgeis less than half the length of the cross tee, use theremaining portion of the border of the previously cut tee.Steel cross tees have the same tab on both ends and,like the aluminum tees, do not require tools forinstallation. The procedures used in their installation arethe same as those just described for aluminum. A steelcross tee assembly is shown in figure 5-25. The finalstep after completion of the grid system is theinstallation of the acoustical panels.Acoustical PanelsPanel installation is started by inserting all fullceiling panels. Border panels should be installed last,after they have been cut to proper size. To cut a panel,turn the finish side up, scribe with a sharp utility knife,and saw with a 12- or 14-point handsaw.5-18
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