CEMCO' s patented DDA (Deflection Drift Angle) is a UL certified composite intumescent/steel angle accessory that provides unencumbered fire-protection up to 2” at the head-of-wall joint in accordance with UL-2079 “Test for Fire Resistance of Building Joint Systems”. 

Features

• Universal fit for any wall type regardless of the width, gauge, height, radius, pitch and whether it is a shaft wall or standard wall
• Installed only on the fire-rated walls
• No mechanical fasteners required
• Fluted pan deck application only requires a single-sided spray application utilizing any of Rectorseal brand fire sprays 
• Fire spray goes over DDA before drywall installation for early unrestricted access to head-of-wall
• Uses up to 75% less fire spray than traditional head-of-wall joint systems
• The outer leg of the DDA is manufactured from red galvanized steel for easy recognition
• Once framing studs are secured into place the DDA is lightly tapped into place over the leg of the header track
• The DDA must be installed before drywall is installed
• Allows the wall assembly to move both laterally and vertically without any movement restriction from the fire-stopping material
• End joints can be abutted tight or overlapped