REPORT TO CITY COUNCIL
To:Honorable Mayor and Members of the City Council
From:Jason Simpson, City Manager
Prepared by:Shannon Buckley, Assistant City Manager
Date:August 12, 2025
Subject:Agreement with Hester Roofing for the Fourth Floor Canopy Roofing on the New City Hall Project (CIP Project No. Z20006)
Recommendations
Approve and authorize the City Manager to execute an Agreement with Hester Roofing for fourth floor canopy roofing, bid set ‘G’, on the New City Hall Project (CIP Project #Z20006in an amount not-to-exceed $148,200.00 in such final form as approved by the City Attorney, authorize the City Manager to execute change orders not to exceed a 10% contingency amount of $14,820.00 for construction uncertainties and adjustments, and authorize the City Clerk to file the notice of completion and return withheld retention to the contractor once the entire scope of work is complete.
Background
Following in-depth consultations with the project architect and representatives from various construction trades to include product manufacturer representatives, consensus was reached regarding the fourth-floor steel canopy of the new City Hall. The collaborative assessment determined that enhanced protection for the steel roof was essential, particularly to preserve the structural integrity against weather exposure and premature deterioration. Additionally, there was a recognized opportunity to improve comfort level performance for the area below the canopy.
Discussion
To address these identified improvements, the installation of a thermoplastic polyolefin (TPO) water barrier roofing system is recommended. The TPO system would serve a dual purpose:
•Provide a highly effective water barrier to shield the steel canopy from moisture intrusion and environmental wear.
•Offer additional insulation benefits, thereby improving thermal comfort efficiency for the occupied spaces beneath the canopy.
City Hall – Hester Roofing
To fully evaluate this situation three contractors (Hester Roofing, SAS Construction, and Best Contractors) were invited to assess the requirements and provide a written proposal to accomplish the work. Both SAS Construction and Best Contractors did not choose to make a proposal. Hester Roofing provided several alternatives with a written full cost proposal of $148,200. The scope of work below was jointly developed by the architect, manufacturer representatives and staff:
Hester Roofing shall furnish all labor, materials, supervision, and equipment necessary to install a mechanically attached GAF EverGuard 60 Mil TPO roofing system over ½" Struct 1 plywood sheathing and ½" Polyiso barrier insulation board, in full compliance with the California Building Code, CAL/OSHA, and California prevailing wage laws.
Work to include the following:
1. Install ½" Struct 1 plywood sheathing over the existing metal deck, mechanically fastened per building code.
2. Install ½" EnergyGuard NH HD Polyiso cover board, mechanically fastened per manufacturer’s specifications.
3. Install one layer of GAF EverGuard 60 Mil TPO membrane, mechanically fastened per manufacturer requirements.
4. Hot air weld all seams and edges for a watertight seal.
5. Install 5" face, 24-gauge galvanized edge metal at all perimeter edges, mechanically fastened and stripped in per manufacturer’s details.
6. Fully adhere wall flashings with termination bars at the tops of all vertical surfaces per GAF details.
Inclusions:
•Provide all materials, labor, supervision, equipment, and tools to complete scope. •Full compliance with CAL/OSHA safety standards, including certified fall protection practices.
•All personnel compensated at California prevailing wage rates per applicable public works requirements.
•Maintain and submit certified payroll records in accordance with DIR requirements. •Daily cleanup and removal of all project-related debris. •Estimated project duration: 15 business days, weather permitting. •Includes 10-year workmanship warranty from completion date.
Approval of this contract will ensure the City Hall’s fourth-floor steel canopy is both protected and insulated in line with industry standards, supporting the City’s commitment to quality, longevity, and sustainability in its capital improvement projects.
Fiscal Impact
Funding costs are included in the Fiscal Year 2025/2026 – 2027/2030 Capital Improvement Plan (CIP) budget, CIP Project #Z20006.
City Hall – Hester Roofing
Attachments
Attachment 1 - Agreement
Exhibit A - Proposal
City Manager's Office