A structurally reinforced insulated dynamic roof curb for securely fastening a mechanical unit thereon is disclosed. The structurally reinforced insulated dynamic roof curb is generally comprised of a plurality of sheet-metal capture tracks positioned on the roof to define a generally rectangular or square configuration, a plurality of structurally reinforced insulated sheet-metal encased support members positioned within the plurality of capture tracks, a plurality of vertically extending support tubes joined together with a plurality of spanning cross-support tubes within the encased support members, wherein the cross-support tubes span between the vertically extending support tubes, and wherein the vertically extending support tubes are spaced apart and positioned along the length of the insulated sheet-metal encased support member thereby defining the structurally reinforced insulated dynamic roof curb. A mechanical unit is fastened onto optional seismic isolators that are selectively positioned on the top surfaces of the structurally reinforced insulated dynamic roof curbs.