Abstract: Embodiments of the present invention provide improved metal roofing and siding systems. In one aspect of the invention, a roofing or siding system configured to be positioned against a structure is provided. The roofing or siding system includes a first panel including a female locking element opening away from the structure when positioned thereon; a second panel including a male locking element directed toward the structure when positioned thereon; and an anchor bar configured to be attached to the structure, wherein the anchor bar defines an channel directed away from the structure which is configured to engage the male locking element and defines a flange directed towards the structure that is configured to engage the female locking element.