Systems and Methods for Secure Metal Roofing

A method for securing a metal roofing system to a roof structure, the method comprising:

• positioning at least one elongate bar on the roof structure, the at least one elongate bar comprising a plurality of slots spaced apart from one another in a longitudinal direction;
• securing the at least one elongate bar to the roof structure using a plurality of first fasteners each disposed within a respective slot of the plurality of slots for securing the at least one elongate bar to the roof structure, the plurality of slots being sized to accommodate a difference in thermal expansion between one or more of the at least one elongate bar, the plurality of first fasteners, and the roof structure so as to curtail the plurality of first fasteners from backing out of the roof structure;
• securing at least one roofing panel to the at least one elongate bar using a plurality of second fasteners configured to secure the at least one roofing panel to the at least one elongate bar;
• and
• positioning a moisture barrier between the roof structure and the at least one elongate bar and at least one roofing panel.