Type SC Double-Wall panel constructions are rigid preassembled units installed with tongue and groove or flush connections. Panels are available as 2-1/4" and 4-1/4" thick. The acoustic fill is packed under compression and the perforated or solid back sheet protects against settling and harboring of vermin. Solid backed panels provide transmission loss.

Standard Type SC panels are constructed using a minimum of 22 gauge perforated steel and 18 gauge solid sheets. For exterior applications, 20 perforated steel is utilized. Internal stiffeners, trim, and framing are fabricated of 16 gauge steel.