Stackable interlocking structural foam blocks for supporting patios and other hardscape block systems

A stackable interlocking support block comprising:

• a rigid foam body comprising:
• a top side and a bottom side opposite the top side;
• a front side and a rear side opposite the front side;
• and
• a first side and a second side opposite the first side;
• a geogrid interface integral with the top side and comprising:
• an apron having an outer periphery that is adjacent to the first side, the front side, and the second side, the apron having an inner periphery spaced from the outer periphery;
• and
• a channel adjacent to and extending along the inner periphery of the apron, the channel having an open top;
• and
• a vertical interlock system integral with the rigid foam body and comprising:
• a top side interlocking structure associated with the top side and comprising, from the channel to the rear side, a first plurality of ridges each parallel to the front side and having a front-rear depth of Wk, each of the first plurality of ridges spaced from each other by a gap having a front-rear depth of Wg;
• and
• a bottom side interlocking structure associated with the bottom side and comprising, from the front side to the rear side, a second plurality of ridges each parallel to the front side and having the front-rear depth of Wk, each of the second plurality of ridges spaced from each other by a gap having the front-rear depth of Wg.