Recommendations for installing customized frameless panels

softdown

I have 44 of these 32" by 62" panels. Bottom is ~2" of blueboard insulation that is very firmly attached to ~ 1/2" of cement board. Above this bottom is ~2 1/2" of blueboard spacers. Presumably to keep the temperature reasonable. These panels still work very well after ~6 years of use.

Their is no sign of how they were previously attached to the roof. Thought someone may know "just the right gizmo" to use.

I will be installing at least four on a east facing roof with a black rubber membrane that is glued to 1/2" of cement board. Below the cement board is ordinary 16" (on center) 2 x 4 trusses interspersed with rebar....for security.