In the Acoustical Ceilings Construction Sequence, which step is performed last?

• A. Attach one quarter inch pencil rod to underside of deck
• B. Install acoustical tiles
• C. Insert main tees
• D. Install wall angle around perimeter

Answer: (B)

Understanding the sequence of an acoustical ceiling is about building the supporting framework before adding the finish. First, you establish the room’s boundary with wall angles, which defines the perimeter. Next, you suspend the grid from the deck using pencil rods to set the proper height. Then you assemble the grid by placing main tees (and cross tees) to form the framework. Only after that complete and stable grid is in place do you install the acoustical tiles, which rely on that grid for support and alignment. So installing acoustical tiles is performed last because they require the full, stable grid to hold them correctly.