In shaftwall assemblies, J Runner for the shaftwall is used at the floor and ceiling. The top and bottom J-runners are friction-fit with studs and gypsum shaftliner panels. J-Runner had different sized flanges. Installed up against the shaft is the longer flange. The flange acts as a backstop to make it simple to place the liner panel.

All J-Runners are produced from hot-dipped galvanized steel in standard G40 coating. G60 is available upon special request.