Washington County Ionwave #ENG-26-09 Addendum 4

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. - Government buyer: Board of County Commissioners of Washington County, Maryland; Division of Engineering; County Project Manager. - Project: 540 Western Maryland Parkway Roof Replacement Project, ENG-26-09, Contract MS-PR-328-28. - Roof system and OEMs: Sika Corporation’s Sarnafil S327 80-mil RhinoBond system is the basis of design, or an approved equal. Named potential alternatives are JM’s 80-mil PVC system with JM RhinoPlate attachment and Verisco Verisflex 80-mil PVC membrane. Bidders proposing an equal must document equivalency and provide product, system, and warranty information. - Main work and quantities: Replace approximately 102,768 sq. ft. of existing EPDM roofing; retain the existing 4-inch insulation and add 1 inch of polyisocyanurate insulation plus a high-density cover board to achieve at least R-30. Install a 30-inch-wide continuous PVC walk path and Hickman TerminEdge EX wall coping. Remove skylights and infill openings with matching Type B, 22-gauge metal decking; remove abandoned rooftop mechanical equipment, electrical items, and vent pipes; cap abandoned vents; and retain existing drains with an 8-foot sump at each. - Contingency and unit pricing: A $150,000 construction contingency covers necessary insulation and/or metal decking replacement; unused funds are credited to the County. Bidders must provide installed unit prices per 4-by-8-foot, 2-inch polyisocyanurate insulation sheet and per 4-by-8-foot Type B, 22-gauge metal decking sheet. - Key technical and warranty requirements: The roof system must meet a 120-mph basic design wind speed for a Risk Category IV building under the 2021 International Building Code. Provide a 30-year manufacturer membrane warranty with no monetary limit on roof repair costs and a five-year general contractor workmanship warranty. The existing EPDM membrane must be legally recycled or disposed of. - Performance and local requirement: Begin work within 10 calendar days after written Notice to Proceed and complete it within 60 consecutive calendar days. Contractors must hold a City of Hagerstown license before the building permit can be issued; Washington County will apply for the permit.

Description

The solicitation seeks sealed bids for replacement of the existing EPDM roof membrane at 540 Western Maryland Parkway with a mechanically attached PVC roofing system. The work includes retaining the existing insulation and adding insulation and cover board to achieve a minimum overall R-30 value, removing skylights and infilling openings with metal decking, removing abandoned rooftop mechanical equipment and electrical items, and replacing wall copings. The project also includes a 30-inch continuous PVC walk path, with a 30-year manufacturer’s roofing membrane warranty required. A $150,000 construction contingency will be added to the total bid for necessary insulation and/or decking replacement; bids are due October 28, 2026.

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