Why a Standard Mastic Nozzle Can Be Difficult to Control Around Fire Door Frames

A standard cartridge nozzle is designed to dispense material. That does not mean it is easy to use in every fire-door frame junction. The difficulty starts when the access space, joint width and required bead do not suit the simple cone-shaped outlet supplied with the cartridge. The problem is often control, not capacity Most installers do not struggle because the cartridge cannot deliver enough material. They struggle because it delivers it faster or wider than the joint allows. Around a frame, you may be working close to the wall face, across a rough substrate or into a narrow line partly hidden by the frame profile. The standard nozzle can then force the operator into awkward gun angles and stop-start movement. Watch the gun angle The angle of the nozzle changes where the material lands. A small change at the handle…