Please see the attached article that provides an introduction to troubleshooting roll up (sheet) doors. This article is for light duty sheet curtain doors, such as Janus model 650, Menards 200M, Clopay 150C and Holmes 260H. Most doors used for the research of this article are from stock 4x7, 6x7 and some 9x8.
Any oversized or Medium/Heavy duty models, installers can troubleshoot with Janus technicians by calling 1-866-562-2580.