Heavy duty structural roof curb, with 14 GA minimum steel construction, and intermittent reinforcement. These roof curbs include a large 2 X 4 wood nailer and 1.5” x 3 lb. rigid fiberglass insulation. The curb can be fastened down to the building structure and equipment bolted to the curb’s nailer bracket to prevent uplift. Structural roof curbs are all welded construction, sealed and prime painted upon completion.