Dworshak Powerhouse Roof Replacement

The U.S. Army Corps of Engineers is seeking a contractor to replace the roof system at the Dworshak Powerhouse in Ahsahka, Idaho. The work involves full removal of existing roofing, installation of a new waterproofing assembly, guardrails, fabricated stairs, and a new split‑heat‑pump HVAC unit for the elevator machine room. All work must comply with EM 385‑1‑1 safety and quality requirements, include performance and payment bonds, and be managed under a government‑provided Resident Management System. • Complete demolition of existing roof down to structural decks. • Installation of gypsum sheathing, vapor retarder, polyiso insulation, cover board, and 90‑mil EPDM membrane with 2‑year installer and 30‑year manufacturer warranties. • Add safety guardrails, fabricated metal stairs, and replace elevator HVAC with a split heat‑pump system. • Provide extensive safety, quality‑control, and documentation plans; manage subcontracting and bonding requirements.