A roof system includes a roof deck, a weighted cover board disposed upwardly adjacent the roof deck and a plurality of fasteners coupling the weighted cover board to the roof deck.

A roof system includes a roof deck, a weighted cover board disposed upwardly adjacent the roof deck and a plurality of fasteners coupling the weighted cover board to the roof deck.

A roof system includes a roof deck, a weighted cover board disposed upwardly adjacent the roof deck and a plurality of fasteners coupling the weighted cover board to the roof deck.

A roof system includes a roof deck, a weighted cover board disposed upwardly adjacent the roof deck and a plurality of fasteners coupling the weighted cover board to the roof deck.

A roof system includes a roof deck, a weighted cover board disposed upwardly adjacent the roof deck and a plurality of fasteners coupling the weighted cover board to the roof deck.

A roof system includes a roof deck, a weighted cover board disposed upwardly adjacent the roof deck and a plurality of fasteners coupling the weighted cover board to the roof deck.

A roof system includes a roof deck, a weighted cover board disposed upwardly adjacent the roof deck and a plurality of fasteners coupling the weighted cover board to the roof deck.

A roof system includes a roof deck, a weighted cover board disposed upwardly adjacent the roof deck and a plurality of fasteners coupling the weighted cover board to the roof deck.

A roofing, cladding or siding module is described. The module comprises an underlapping region adapted to be substantially covered by an exposed region of an adjacent overlapping module when installed on a building surface. A plurality of projections are formed on an underside of the underlapping region. The projections are feet to support the module on the building surface to provide a gap between the module and the building surface, and/or provide a profile on the underside of the underlapping region to define a pathway for air flow between the module and the building surface. Each projection is formed by a downwardly projecting portion of the underlapping region with a corresponding cavity in an upper side of the underlapping region, and the cavity is shaped to prevent or minimize water pooling in the cavity.

A converted reverse ballasted roof system is provided including a structural roof beam. Insulation is positioned upwardly adjacent the structural roof beam, and a first waterproofing membrane is arranged upwardly adjacent the first waterproofing membrane. A weighted cover board is disposed upwardly adjacent the first waterproofing membrane and a second waterproofing membrane is installed upwardly adjacent the weighted cover board. The first water proofing membrane and the second waterproofing membrane substantially seal the weighted cover board.