# Washington County Ionwave #ENG-26-09 Addendum 4

Washington County 540 Western Maryland Parkway Roof Replacement

**Posted:** September 25, 2026
**Respond By:** October 28, 2026
**Identifier:** ENG-26-09 Addendum 4
**NAICS:** 238160

Washington County is seeking bids to replace the roof at its 540 Western Maryland Parkway facility 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.
- **Roofing OEMs and named systems:** **Sika Corporation** — Sarnafil S327 80-mil RhinoBond system, the basis of design; **JM** — named potential 80-mil PVC alternative with JM RhinoPlate attachment; **Verisco** — named potential Verisflex 80-mil PVC alternative. Alternatives must be supported by system, product, and warranty information demonstrating equivalency. **Hickman** TerminEdge EX is specified for the wall coping assembly.
- **Main scope and quantities:** Replace approximately 102,768 sq. ft. of existing EPDM roofing with an 80-mil mechanically attached PVC system; retain the existing 4-inch polyisocyanurate insulation and add 1 inch of insulation plus a high-density cover board to achieve at least R-30. Install a 30-inch-wide continuous PVC walk path and new wall copings.
- **Associated work:** Remove and legally recycle or dispose of the existing EPDM membrane; remove skylights and infill their openings with matching Type B, 22-gauge metal decking; remove abandoned rooftop mechanical equipment and electrical items, and remove and cap abandoned vent pipes. Keep existing roof drains and provide an 8-foot sump at each drain.
- **Pricing and contingency:** Include installed unit prices for 4-by-8-foot, 2-inch polyisocyanurate insulation sheets and 4-by-8-foot Type B, 22-gauge metal decking sheets. A $150,000 construction contingency is included for necessary insulation and/or decking replacement; unused funds are credited to the County.
- **Key requirements:** The roofing system must meet a 120-mph basic design wind speed for a Risk Category IV building under the 2021 International Building Code. The membrane requires a 30-year manufacturer warranty with no monetary limit on roof repair costs; the general contractor must provide a five-year workmanship warranty. Proposed equal systems require supporting product, system, and warranty information.
- **Local requirement and schedule:** Contractors must hold a City of Hagerstown license before a building permit can be issued. Work must begin within 10 calendar days after written Notice to Proceed and be completed within 60 consecutive calendar days.

### Description

Washington County is seeking sealed bids for replacement of the existing approximately 102,768-square-foot EPDM roof at 540 Western Maryland Parkway. The work includes installing a mechanically attached PVC roofing system with additional insulation and cover board, removing skylights and infilling their openings with metal decking, and removing abandoned rooftop mechanical and electrical items and vent pipes. It also includes a PVC walk path and replacement of wall copings; the roof system must meet the stated 30-year manufacturer warranty and wind-uplift requirements. A $150,000 construction contingency is added to the total bid for necessary insulation and/or decking replacement, with bidders required to provide unit prices for both materials.

[View original listing](https://washco-md.ionwave.net/PublicDetail.aspx?bidID=534&SourceType=1)