5.4. SR 07-06-2009 - Laserfiche WebLink

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LINDAU April 8, 2009 Rich Czech Arena Manager 1000 School Street Elk River, MN 55330 COMPANIES, INC. PROFESSIONAL ENGINEERS 1074 OLD Hwv 35 HUDSON, WI 54016 (715) 386-4444 OFFICE (715) 386-1441 Fax Re: Elk River Skating Facility -Phase One -SECOND VISIT, Structural Report Dear Rich, Per your direction we visited the "Barn" ice skating facility a second time in March of 2009 to visually review the condition of the roof structure over the west ice rink in an effort to locate additional deteriorated structure for documentation in our report. Because the some of the steel roof structure exposed during our first visit had corroded we suggested a greater number of areas be exposed before formulating our opinion. This letter should not be considered the final report but should provide our complete opinion regarding the condition of the roof steel. As noted after our first visit Lindau Companies, Inc. will issue a final report noting our findings, opinions, and recommendations upon the completion of the next phase of the project. It is our opinion that an adequate number of structural steel members were observed and thus serve as a representative sample. Many of these structural steel members display "surface rust" with no scaled or expanded steel being discovered. With this in mind we believe that, at this time, the structure is still able to perform as it has been since its construction with no reduction in its load carrying capacity due to corrosion. Although we cannot predict the future we are concerned however, that if the structural steel purlins and secondary framing are allowed to corrode further a situation may develop where the load carrying capacity of individual members is reduced. Unfortunately we cannot provide a time frame for this reduction without knowing the progression of the corrosion and developing a historical account. Regardless we believe that in order for the roof structure to have a twenty or thirty year future life span the corrosion must be addressed. Without addressing the corrosion issue we believe the load supporting capacity of the structure could be compromised within five or ten years. This of course is contingent upon environmental conditions and maintenance. It is our suggestion that the environment within the "Barn" be controlled and the roof structure restored if the longer life span is desired. If the longer life span is not needed we would still suggest that any exposed steel be properly prepped and painted and regular observations scheduled. Based on our observations corrosion seems to be mare evident in areas where the finishes are thin or missing thus it may be possible to gain significant time through regular observation and limited maintenance.