Background/Discussion
The Council Bluffs Public Library was constructed in 1998 with 70,951 square feet of available space that allows the Library to provide a large selection of reading materials, archival material viewing, meeting spaces and other services available to the general public.
The roof for the structure was designed to protect the contents and to be a part of the inviting architecture of the building. The current roofing material is a standing seam metal roof system and at the time of construction, and both replacements, this material was the best available to meet the requirements of weather protection and the intended design of the building. The roof has been replaced twice since the Library first opened due to significant hail damage. The most recent replacement occurred after a hail event in 2011.
The current roofing system has failed, and is currently patched in multiple areas to prevent water infiltration. These patches are a temporary means of repair and have to be re-applied regularly to maintain the water tightness of the system. Most of the failed areas are in locations where the roof structure is an extremely low slope. There are very few roofing system types capable of being installed on this structure, and the slope in these areas is the minimum slope that a standing seam metal system can be installed on. There are other areas that are likely to fail in the near future as well, which will require similar temporary patching methods to keep water out of the system. There is currently no available warranty on the system.
The recommendation is to replace the entire roofing system with a more appropriate membrane roofing system that was not an option with previous replacements. Due to the design of the roof it is not advisable to do partial replacements, as roofing system manufactures will not warranty any partial replacements of roofing materials. The new membrane system would consist of a single membrane roof system with ribs of the same material heat welded to the membrane and color matching of the entire system to maintain the design and provide continued protection of the building structure and contents.
This project has been added to the CIP and identified as BM-25-08. The estimated cost of this project is $1,128,000.
This project is an unplanned emergency repair, and ARPA Revenue Loss funds are recommended as the funding source. The Library Foundation has agreed to support the project by providing up to $425,000 in funding..
HGM was selected based on their previous involvement with projects at this location, the study for the roof replacement, and their successful project history with building modification projects for the City. They have a clear understanding of the project scope, and the qualified staff available to dedicate to the project.