Washington County Ionwave #ENG-26-09 Addendum 3

Washington County 540 Western Maryland Parkway Roof Replacement

Washington County is seeking a contractor to replace the roof at its 540 Western Maryland Parkway facility in Hagerstown. - Government buyer: Board of County Commissioners of Washington County, Maryland, through the Division of Engineering; the County Project Manager is identified as the project office contact. - Project: Roof Replacement Project, Contract MS-PR-328-28 (ENG-26-09), at 540 Western Maryland Parkway, Hagerstown, Maryland. Estimated contract value: $500,001–$1,000,000. - Roof system and named manufacturers: The basis of design is Sika’s Sarnafil S327 80-mil RhinoBond PVC roofing system. Johns Manville (JM) and Verisco (Verisflex) are named as potential alternative system manufacturers; proposed alternatives require documentation demonstrating equivalency. Hickman is specified for the TerminEdge EX coping assembly. - Main work and materials: Replace approximately 102,768 square feet of existing EPDM roofing with a true 80-mil mechanically attached PVC system. Add 1 inch of polyisocyanurate insulation over existing 4-inch insulation, plus high-density cover board, to achieve at least R-30 overall. Provide a continuous 30-inch-wide PVC walkway. - Remove skylights and infill openings with matching Type-B, 22-gauge metal decking. Remove and recycle or legally dispose of the existing membrane. - Remove abandoned rooftop mechanical equipment, electrical items, and vent pipes; make safe, cap or dispose of items as applicable, and pump down refrigerant before cutting refrigerant lines where required. - Install Hickman TerminEdge EX two-piece wall copings with an extruded aluminum anchor bar and 24-gauge Kynar-finished steel fascia. Existing roof drains remain, with an 8-foot sump at each drain. - Provide installed contingency unit prices for 4-by-8-foot-by-2-inch polyisocyanurate insulation sheets and 4-by-8-foot Type-B, 22-gauge metal decking sheets. Quantities for these contingency materials are not specified. - Notable technical and warranty requirements: The roof system must meet wind-uplift requirements for Risk Category IV buildings under the 2021 International Building Code and accommodate curbs as low as 3 inches while preserving the manufacturer warranty. Include a 30-year manufacturer warranty and a five-year general-contractor workmanship warranty. - Performance period: The bid documents state that work must begin within 10 calendar days after the Notice to Proceed and be completed within 60 consecutive calendar days. Other bid materials describe a later anticipated completion window, so the schedule should be confirmed against the final contract documents. No recurring subscription or option years are indicated. - Other vendor named: Washington County is the buyer; no reseller or distributor is identified. The attachment also describes independent contractor work or services but does not name a service vendor.

Description

The project replaces approximately 102,768 square feet of existing EPDM roof membrane with a true 80-mil, mechanically attached PVC roof membrane. Work includes adding polyisocyanurate insulation and high-density cover board to provide a minimum overall R-30 value, removing skylights and infilling openings with metal decking, and removing abandoned rooftop mechanical equipment, electrical items, and vent pipes. The scope also includes a continuous PVC walk path and replacement of all wall copings. The existing roof drains remain in place, and the contractor must recycle or legally dispose of the existing EPDM membrane.

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