An injection molded product is disclosed and includes a shingle resembling a cedar shingle tile formed from an amorphous or semi-crystalline thermoplastic and having a wood grain direction. The injection molded product also includes streaks in the shingle that are substantially parallel to the wood grain direction and the streaks extend through an interior of the shingle and appear as contrasting streaks on an exterior of the shingle to form a variegated wood grain appearance. The injection molded product further includes an injection molded vestige in the shingle. The injection molded vestige is located adjacent to a perimeter of the shingle and the injection molded vestige comprises a location at which material entered an injection mold through a gate.

An injection molded product is disclosed and includes a shingle resembling a cedar shingle tile formed from an amorphous or semi-crystalline thermoplastic and having a wood grain direction. The injection molded product also includes streaks in the shingle that are substantially parallel to the wood grain direction and the streaks extend through an interior of the shingle and appear as contrasting streaks on an exterior of the shingle to form a variegated wood grain appearance. The injection molded product further includes an injection molded vestige in the shingle. The injection molded vestige is located adjacent to a perimeter of the shingle and the injection molded vestige comprises a location at which material entered an injection mold through a gate.

An injection molded product may include a corner shingle resembling a single course of tiles that differ in size. The corner shingle may be a semi-crystalline thermoplastic and having a wood grain direction. Streaks may be formed in the corner shingle that are substantially parallel to the wood grain direction. The streaks may extend through an interior of the corner shingle and appear as contrasting streaks on an exterior of the corner shingle to form a variegated wood grain appearance. In addition, an injection molded vestige may be formed in the corner shingle. The injection molded vestige may be located adjacent a perimeter of the corner shingle, and may comprise the location at which material entered an injection mold through a gate.

An injection molded product may include a corner shingle resembling a single course of tiles that differ in size. The corner shingle may be a semi-crystalline thermoplastic and having a wood grain direction. Streaks may be formed in the corner shingle that are substantially parallel to the wood grain direction. The streaks may extend through an interior of the corner shingle and appear as contrasting streaks on an exterior of the corner shingle to form a variegated wood grain appearance. In addition, an injection molded vestige may be formed in the corner shingle. The injection molded vestige may be located adjacent a perimeter of the corner shingle, and may comprise the location at which material entered an injection mold through a gate.

A self supporting panel system used to fabricate ceilings, floors, walls, or roofs. The panel system is assembled from a plurality of panels, each having a core that is sandwiched between opposing plate members. In a preferred embodiment, the core of each panel includes a unifying material to enhance the load bearing capacity of the panel.

A self supporting panel system used to fabricate ceilings, floors, walls, or roofs. The panel system is assembled from a plurality of panels, each having a core that is sandwiched between opposing plate members. In a preferred embodiment, the core of each panel includes a unifying material to enhance the load bearing capacity of the panel.

A self supporting panel system used to fabricate ceilings, floors, walls, or roofs. The panel system is assembled from a plurality of panels, each having a core that is sandwiched between opposing plate members. In a preferred embodiment, the core of each panel includes a unifying material to enhance the load bearing capacity of the panel.

A self supporting panel system used to fabricate ceilings, floors, walls, or roofs. The panel system is assembled from a plurality of panels, each having a core that is sandwiched between opposing plate members. In a preferred embodiment, the core of each panel includes a unifying material to enhance the load bearing capacity of the panel.

Method for designing a corrugated roofing sheet made of natural fibres, impregnated with bitumen including a uniform pattern of mutually parallel alternating corrugations borne by a mid-plane, the corrugations defining rounded crests each separated from the next by a rounded trough, the crests and trough being connected by alternately inclined portions, the transverse offset between two successive crests being equal to the transverse offset between two successive troughs and defining the pitch P of the corrugations, the sheet having a thickness E of material substantially constant over its extent, and a height H being twice the distance between the mid-plane and the exterior surface of a crest or twice the distance between the mid-plane and the exterior surface of a trough, these two distances being identical. The height, thickness and pitch values are determined by Fi<H.sup.3/(8E(H+P))<Fs, where Fi=25 mm and Fs=35 mm.

Improvements a roof tile with an integrated riser is disclosed. The roof tile with integrated riser has the shape and color to provide a similar appearance to the original tiles. The integrated riser provides a support and complete sealing to prevent intrusion from water through the riser. The riser can be formed by insert casting the riser into the roof tile, or can be bonded into a pocket in the roof tile. The composition of the roof tiles can be adjusted to reduce how brittleness of the tile. The roof tile is secured to the roof sheeting and studs. Filler material in the tile composition can also provide additional sealing capability to nails or screws that are used to secure the roof tile. The roof tile is a simpler installation that does not require removal of a large number of tiles from the existing roof.