HomeMy WebLinkAboutWS Item #1 - City Council Packet - City Hall Civic Center Roof Replacement PresentationFY2023
Repair and Replacement
of Roof System -City
Hall/Civic Center
•Background
•Options for Building Roof Replacement
•Initial Project Plans and Specifications
•Bid Process, Code Compliance and Addendums
•Resultant Bid for Roof Replacement
Background
•In advance of the FY23 Budget the City
engaged an A&E firm to look at the Roof
System and provide options and
recommendations
•Part of the A&E process was a thorough
moisture survey of the entire roof field
•±47,854 square feet of Mod Bit roof area
& ±11,790 square feet of Gravel roof
area
•Provided reports, repair
recommendations and budget estimates
25,350 Sq. Ft. of saturated (compromised) roof –42.5% of the entire field
A&E Budget Estimates –Roof System
$1,000,000.00 & A&E Fees $200,000.00
Options
•Discussed at WS with Council and
lower cost options were requested
•PW met with various Roof Contractors
and Manufacturers
•As a cost savings option PW, brought
the project “in house” for design,
specifications, bidding and letting
•Key Roof Performance Goals:
Warranty, Wind & Fire Code Compliant
Project
Details
•Degraded Gypsum (3”) Roof Deck -±13,560 square
feet –cut out install B deck and cap with Polyiso
Insulation
•Heated and Cooled Areas Roof System: GAF
EverGuard® TPO (Thermoplastic polyolefin)-60 mil
Membrane
•Canopy: Clean, strip, install fanfold insulation and cap
with GAF EverGuard® TPO (Thermoplastic polyolefin)-
60 mil Membrane
•Work included the installation of all flashings, curbing,
walk pads, parapet wall treatments and all other
appurtenances necessary for a sealed roof envelope
Bid &
Addendums
•Large attendance at the mandatory pre-bid meeting
•Wind code compliance became challenging
•Multiple request for equivalency of manufacturers
products and systems. Systems approved (pre-bid):
•GAF EverGuard® Fleece-back TPO Ultra 60-mil
Membrane
•Versiweld Thermoplastic Membrane (TPO) -60 Mil TPO
Roofing System
•Duro-Last® PVC Sheet Roofing -Duro-Last® Duro-Tuff®
60-Mil (DT60) membrane
•Three addenda were issued
Bid Results
•Five (5) Responsive Bidders
•Three different roof systems that all meet:
•Warranty -5-yr workmanship & 15-yr material
•Fire and Wind Code
•Low Bid (PVC) System -$522,110.00 Base Bid
•Unit Price for additional Gypsum Decking replacement
$16.00/SF
•15% of base as budget holder -$32,544.00
•No hard A&E Costs –PW will Project Manage and
conduct Construction Inspection in conjunction with
Building Department
Bid Results