•Make Installing Rigid Drywall EZ. The Steeler Z Furring Channel is an installer's dream, as it allows you to create a firmer and more level foundation to support rigid drywall. Developed for use on concrete and masonry walls, Steeler Z Furring Channel is heavy-duty enough to supplement the strongest of structures. •Steeler Z Furring Channel is offered in the following gauges: 25, 30ES, 22, 20DW (030 mils), 20 (033 mils), 18, 16, and 14. •Our Z furring channel meets or exceed ASTM A370, A1003, C645, C754, C955, C1513, E90, and E119. Easily install drywall to masonry or concrete walls using Z furring channel in between boards.