A plastic panel includes a middle portion. Two opposing sides of the middle portion are defined as a first engaging portion and a second engaging portion, respectively. Each engaging portion has a concave portion, a convex portion, a protruding portion and a recess portion. Two adjacent plastic panels can be firmly connected through their concave portions, convex portions, protruding portions and recess portions. Besides, two adjacent plastic panels facing up or facing down can be engaged and connected with each other.

A plastic panel includes a middle portion. Two opposing sides of the middle portion are defined as a first engaging portion and a second engaging portion, respectively. Each engaging portion has a concave portion, a convex portion, a protruding portion and a recess portion. Two adjacent plastic panels can be firmly connected through their concave portions, convex portions, protruding portions and recess portions. Besides, two adjacent plastic panels facing up or facing down can be engaged and connected with each other.

A connecting system for boards, and a connecting device and a support element for boards are disclosed. The connecting system includes the support element configured to support at least one board and the connecting device configured to releasably fasten the at least one board to the support element. The support element includes at least one lateral surface with at least one locking member arranged on the lateral surface. The connecting device includes at least one arm with a locking member configured for engagement with the locking member of the support element. At least one of the locking member of the support element and the locking member of the connecting device includes a plurality of protrusions forming a plurality of locking positions of the connecting device relative the support element.

An extruded convex plastic panel (100) for use in a metal roof system (118) including a light transmitting member (101) having top and bottom layers (101A, 101B) and a rib structure (102) disposed between the top and bottom layers (101A, 101B). The extruded convex plastic panel (100) further includes a pair of standing seams (103, 106) provided along two opposite side edges of the light transmitting member (101). A pair of connector assemblies (105, 115) provided as a separate unit, which connects the extruded convex plastic panel (100) to the metal roofing system (118) and allows the light transmitting member (101) to expand and contract freely without the use of any fasting devices for connecting the extruded convex plastic panel (100) to the metal roofing system (118).

A tufted geosynthetic lightweight ballast system for roof protection in which the system comprises a composite of one or more geotextiles tufted with one or more synthetic yarns.

A tufted geosynthetic lightweight ballast system for roof protection in which the system comprises a composite of one or more geotextiles tufted with one or more synthetic yarns.

The present teachings relate to a solar roof forming element for forming a solar roof of a building, comprising an extruded, elongate polymer roof plate, element coupling means, at least one solar panel covering the roof plate, panel coupling means for coupling the solar panel to the roof plate, comprising a first coupling part at a first side of the roof plate and a second coupling part at a first side of the solar panel, said coupling parts configured such that they mutually couple as a result of a movement of the solar panel relative to the roof plate, wherein in a coupled state a movement of the solar panel away from the roof plate in a direction perpendicular to the roof plate is blocked. The present teachings further relate to a combination of such solar roof forming elements, to a building, and to a method of forming a roof.

A method of injection molding a building product includes providing an injection mold with a plurality of gates located adjacent a perimeter of the injection mold. The method further includes commingling a first material and a second material into a flow, the second material comprising a color that contrasts with a color of the first material and injecting the commingled flow into the plurality of gates to form a building product. Thereafter, the method includes removing the building product from the injection mold. The second material extends through an interior of the building product and appears as contrasting streaks on an exterior of the building product to form a variegated grain appearance. The method also includes notching a portion of the building product, such that the building product has a substantially linear grain in an exposed portion thereof.

A method of injection molding a building product includes providing an injection mold with a plurality of gates located adjacent a perimeter of the injection mold. The method further includes commingling a first material and a second material into a flow, the second material comprising a color that contrasts with a color of the first material and injecting the commingled flow into the plurality of gates to form a building product. Thereafter, the method includes removing the building product from the injection mold. The second material extends through an interior of the building product and appears as contrasting streaks on an exterior of the building product to form a variegated grain appearance. The method also includes notching a portion of the building product, such that the building product has a substantially linear grain in an exposed portion thereof.

An interlocking panel system for covering a base surface with interlocking panels to prevent water ingress. A first panel is secured to the base surface. A second panel interlocks with the first panel via a hook portion on the second panel entering a receptacle of the first panel. The hook portion expands after entering a retaining portion of the receptacle, thereby preventing the hook portion of the second panel from being withdrawn from the first panel.