Roof paver element and system

A roof paver element for providing ballast for a roof comprising:

• an elongate planar portion;
• and
• a plurality of drainage grooves defined by spaced, generally parallel ribs projecting from the planar portion and terminating in feet each having a bottom surface for contacting the roof, said bottom surface being greater in area than every cross section of the rib above the foot and parallel to said bottom surface,
• wherein said parallel ribs define the width of said drainage grooves, and the width of some of said drainage grooves is tapered along the length of the drainage grooves for breaking vacuum with a mold.

A roof paver system for providing ballast for a roof comprising:

• a plurality of roof paver elements, each including a plurality of drainage grooves;
• and
• a plurality of connector members, each connector member positioned within and mating with the drainage grooves of adjacent roof paver elements,
• wherein said drainage grooves in which said connector members are positioned are dovetail shaped and said connector members are circular in cross section.

A roof paver system for providing ballast for a roof comprising:

• a plurality of roof paver elements, each including a plurality of drainage grooves;
• a plurality of connector members, each connector member positioned within the drainage grooves of adjacent roof paver elements;
• and
• means for aligning said roof paver elements and securing said roof paver elements to said roof,
• wherein each roof paver element has roof-engaging feet including outwardly projecting toe portions, and said aligning and securing means comprises elements mating with the outwardly projecting toe portions of at least some of said paver elements.