Ballast block deck system and pedestal assembly therefor

A ballast block deck system for forming an elevated surface (14) on an existing roof structure, comprising:

• a plurality of ballast blocks (12) laterally positioned in a pattern to form a deck, each of said ballast blocks (12) having a predetermined thickness (T1) and multiple corner portions (22), said pattern including intersection areas (32) in which corner portions (22) of adjacent ballast blocks (12) extend, said corner portions (22) of said ballast blocks (12) each having a top surface (16) with an upwardly open groove (20) and a recessed area (18), said groove (20) extending to a greater depth within the ballast block (12) than said recessed area (18);
• a pedestal assembly (30) located directly beneath one of said intersection areas (32) for supporting said corner portions (22) of said adjacent ballast blocks (12) a spaced distance above the existing roof surface;
• said pedestal assembly (30) including a support plate (34) having a support surface for supporting said corner portions (22) of said adjacent ballast blocks (12) thereon, and said pedestal assembly (30) including a removable cap (42) which overlies said corner portions (22) of said adjacent ballast blocks (12) and a fastener (44) which removably attaches said cap (42) to said support plate (34) so that said corner portions (22) of said adjacent ballast blocks (12) are captured between said support plate (34) and said cap (42).