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Item No: 7N Meeting Date: May 23, 2011 Type of Business: Council Business Administrator Review: ____ City of Mounds View Staff Report To: Honorable Mayor and City Council From: Nick DeBar, Public Works Director Item Title/Subject: Resolution 7797, Approving the Bidding Documents and Authorizing Advertisement for Bids for the 2011 Partial Reroofing of City Hall and Full Reroofing of Well House Nos. 5 and 6 Project Background: Public Works has been investigating reoccurring roof issues over the past year, including having a comprehensive roof management program completed for all City-owned buildings. This program recommends a partial reroofing of City Hall and a full reroofing of Well House Nos. 5 and 6 for 2011 construction. In December 2010, the City Council authorized INSPEC, Inc. to design and prepare bidding documents for reroofing of these facilities (Res. 7713). Discussion: INSPEC has designed and prepared preliminary plans and specifications for the 2011 reroofing project. A small portion of the Community Center roof (over the kitchen) was to be included in the project. However, since the rest (and majority) of the Community Center is scheduled for a reroofing in 2012, that portion is now planned to be done next year with the rest of the Community Center. The following is a narrative of the project scope: Existing System: The existing roof system on City Hall areas A (1960 original building) and B (1975 addition) were installed in 1998. Area A consists of a double tee concrete deck; Area B is a steel deck system; and both areas have two layers of 2" insulation and a ballasted 45-mil EPDM membrane. Wells #5 and #6 have 3" to 4" of polystyrene insulation and a ballasted 45-mil EPDM membrane. The existing insulation R-value is approximately 23. New Roof System: The new roof system was evaluated to determine the best roof system/long term value for the facility. The decision was made to design/install a built-up roof system. The existing roof drains are the original drains at City Hall. They will be replaced with new drains at existing locations. The height above the deck will accommodate the new tapered insulation sumps to improve drainage. New overflow scuppers will be installed at existing locations. At Well House Nos. 5 & 6, new primary scuppers will be installed with new tapered insulation sumps to improve drainage. Special Items: Special items of concern include raising HVAC units, existing gas and electrical lines on roof deck, and removing any obsolete items and replacing with new deck at existing openings. Construction Estimate (INSPEC): INSPEC’s estimated construction costs for the partial reroofing City Hall is $260,000 and $23,000 for each well house for a total estimate of $306,000. Funding: