A motorized crimping mechanism to impart substantially 90 degree crimps to adjacent roof and/or wall panel seams of a fabricated edifice is provided. Such a crimping device allows for substantially uniform seaming along the target contact line of two adjacent panels with substantially similar pressures and torque applied thereto at the selected locations of crimp application. The motorized device itself includes a rotary drive shaft to apply sufficient pressures for 90 degree crimps in two adjacent metal panels, as well as an optional guide to ensure proper placement and direction along the entire contact line between such panels. The invention thus encompasses the device as well as the method of using such a motorized crimper for connecting standing seams of adjacent side edges of two building panels.