The invention is a roof system having panels attached by battens and adjustable hangers. The hangers have a leg, a tail and a hook. The hanger is supported by a batten strip material, typically made of metal with slots. These hangers are permanently secured within the battens and are non removable once the batten is fastened to a roof deck. The hangers themselves are adjustable to different lengths by sliding them within the slot with a predetermined amount of force to accommodate staggered panel edges. This dramatically reduces the labor and costs required to install roofing panels.

A system includes a plurality of photovoltaic modules, each having a mat with an edge and a spacer with an edge, the edge of the mat being attached to the edge of the spacer. The spacer includes a plurality of support members and a solar module mounted to the support members. Each of the support members includes a ledge. The solar module and the ledge form a space therebetween. The space is sized and shaped to receive an edge of a solar module of another of the photovoltaic modules. The spacer of one of the photovoltaic modules overlays the mat of another of the photovoltaic modules.

A system includes a plurality of photovoltaic modules, each having a mat with an edge and a spacer with an edge, the edge of the mat being attached to the edge of the spacer. The spacer includes a plurality of support members and a solar module mounted to the support members. Each of the support members includes a ledge. The solar module and the ledge form a space therebetween. The space is sized and shaped to receive an edge of a solar module of another of the photovoltaic modules. The spacer of one of the photovoltaic modules overlays the mat of another of the photovoltaic modules.

A method and apparatus for installing roofing shingles on a roof deck in a top-to-bottom manner is disclosed. Engineered battens am positioned and installed on the roof deck in a bottom-to-top manner. Each batten has a female mating area which allows complementary shingles to be securely attached to the battens by sliding a corresponding mating portion of a shingle into the mating area of the batten resulting in a snap-fit engagement which secures the shingles onto the roof deck without nails. The method and apparatus have several unique advantages, such as allowing shingles to expand and contract (breathe) without buckling and/or tearing when the ambient temperature fluctuates. In addition, since the manner of installation is from top-to-bottom, this allows roofers to use the rows of nailed battens as safety scaffolding improving roofers' traction and ultimately enhancing their safety while performing this inherently dangerous job.

A support structure for tile comprising a pair of flanges separated by and extending outward from the spine of the support structure each with an upper most planar surface. Where the tile comprises of a first face that is entirely planar, a second face that is entirely planar that is opposite the first face, a plurality of side edges extending between the first face and the second face with each of the plurality of side edges being square with respect to the first face and the second face, and a groove formed in at least one of the plurality of side edges. The groove of the at least one of the plurality of edges of the tile is configured for engagement by the first support structure rail of the support structure. The second face of the tile rests on the upper most planar surface of one of the pair of flanges.