Roof mounting plates allow rooftop access to the sensor cable, allowing it to be installed, wired, and serviced from outside the silo. The mounting plate kit comes complete with sealant, self-tapping screws, a template for cutting the hole, and mounting instructions. Nine mounting screws provide a strong attachment to the roof sheets and spread the pulling force of the roof plate to adjacent roof sheets for added strength and stability. Mounting plates may also be mounted near the overlap junction of two roof sheets, displacing the pulling force to both roof sheets. For very large or tall silos, the mounting plate may also be mounted in the middle of the sheet using a one or three-bar support system.