UL20 is a panel that is snapped together during installation. It is an engineered integral interlocking system by design which installs in one direction from a given starting point.
DOUBLE-LOCK STRUCTURAL STANDING SEAM ROOF PANEL
Metal Roofing Panel System: Tite-Loc Plus - Low Slope Roofs
T-Lock Standing Seam Panels
T-Lock Standing Seam Panels
Champion Metal
Metal Roofing Panel System: PAC-150 90° Single Lock Standing Seam
TAPERED SEAM TS METAL STANDING SEAM PANEL
Edge-Loc 1.0 - PAC Contractors Association
Roof Panels
Section II – AISD Master Guide Specifications - Austin ISD
Metal Roofing Panel System: PAC-150 180° Double Lock
T-Lock Standing Seam Panels
Alpine SnowGuards: Dimensional Metals