Washington County Ionwave #ENG-26-09 Addendum 5

Washington County 540 Western Maryland Parkway Roof Replacement

Washington County is seeking a contractor to replace the roof at 540 Western Maryland Parkway in Hagerstown, Maryland. - Buyer: Board of County Commissioners of Washington County, Maryland, through the Division of Engineering; project ENG-26-09, Contract MS-PR-328-28. - Scope: Replace approximately 102,768 square feet of existing EPDM roofing with a mechanically attached, true 80-mil PVC system. The basis of design is Sika Corporation’s Sarnafil S327 RhinoBond system; proposed equals require detailed product, system, and warranty information. - Named manufacturers and products: Sika Corporation/Sarnafil, Johns Manville (JM), Verisco (including Verisflex), and Hickman (TerminEdge EX coping). JM’s PVC 80-mil/RhinoPlate and Verisflex 80-mil PVC are mentioned as alternatives, not pre-approved equals. The contract document also names TTI Environmental Inc.; it is not identified as an OEM in the solicitation summary. - Roof materials and quantities: Approximately 102,768 sq. ft. of PVC roofing; retain the existing 4-inch polyisocyanurate insulation and add insulation and high-density cover board to achieve at least R-30. Skylight openings are to be infilled with matching Type-B, 1½-inch, 22-gauge metal decking. Provide a continuous 30-inch-wide PVC walkway and replace wall copings with Hickman TerminEdge EX assemblies. - Bidders must provide installed unit prices for 4-by-8-foot, 2-inch polyisocyanurate sheets and 4-by-8-foot Type-B, 22-gauge metal-deck sheets for contingency work. - Other work: Remove skylights and designated abandoned rooftop equipment; safely remove abandoned electrical items and remove and cap abandoned vent pipes. Legally recycle or dispose of the existing EPDM membrane. Keep existing roof drains and provide an 8-foot sump at each drain. - Key requirements: Roofing must meet the specified wind-uplift criteria for a Risk Category IV building, including the stated 120-mph design requirement. Provide a 30-year manufacturer’s warranty with no monetary limit and a five-year general-contractor workmanship warranty. A $150,000 construction contingency is included for potential insulation and metal-deck replacement. The contractor must hold a City of Hagerstown license before permit issuance. - Contractor reference: TTI Environmental Inc. is named in an attachment’s contract summary; the opportunity is presented as a solicitation, not an award.

Description

The Board of County Commissioners of Washington County, Maryland, is soliciting sealed bids for replacement of the existing EPDM roof membrane, approximately 102,768 square feet, with a mechanically attached PVC roofing system. Work includes adding insulation and cover board to achieve a minimum R-30 value, removing skylights and infilling the openings with metal decking, removing designated abandoned roof equipment and electrical items, capping vent pipes, installing a PVC walk path, and replacing wall copings. The existing 4-inch insulation layer is to remain; roof drains remain in place, with 8-foot sumps provided at each drain. Bids are submitted through the Washington County Bidding Site and are due October 28, 2026, at 2:00 p.m. EDT.

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