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AG 2008 09 22
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AG 2008 09 22
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Last modified
1/28/2010 3:26:01 PM
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11/27/2017 11:28:59 AM
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Meeting Minutes
Doc Type
Minutes
Meeting Minutes - Date
1/28/2010
Board
Board of Commissioners
Meeting Type
Regular
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:~`~~_~. ~~~ :~ .~_ ~COItiiSTRU Oltii <br />~~~ <br />Metal Roofs Score Best in Com arative Anal sis <br />p y <br />Of roof life expectancy, life material failure. By comparison, 30% <br />of the built-up roofs and 56% of the <br />CyC~e COStS~ rYldlClte'11dnCe OUtIayS resglt pl iromfmateral falu e~eaks <br />g <br />Metal roofs have a significantly <br />longer expected service life than <br />either built-up roofing or single-ply <br />roofs, according to a 2004 study of <br />low slope roofing conducted by <br />Ducker International, aDetroit-based <br />research organization that <br />specializes in construction materials. <br />Study participants said they expected <br />metal roofs to last 40 years-17 years <br />longer than built-up and 20 years longer <br />than single-ply systems. <br />At the same time, respondents to <br />the Ducker study said they expected <br />Fife cycle costs of a metal roof, <br />including outlays for maintenance, to <br />be about 30 cents a sq. ft. per year, <br />significantly less than the 37 cents <br />for built-up roofs and 57 cents for <br />single-ply roofs. <br />Expected Service Life <br />40 years <br />ea <br />y , rs 20 years <br />Metal Built-up Single-ply <br />Service life and life cycle costs <br />were the two most important of 10 <br />criteria considered when purchasing <br />a roof system, respondents said. <br />On a scale of one to five (with five <br />representing an extremely important <br />consideration), service life rated a 4.8 <br />and life cycle costa 4.6. <br />Little Or No Maintenance <br />Required For Metal Roofs <br />The expected low life cycle cost of <br />a metal roof can be attributed, at least <br />in part, to the fact that the owners and <br />managers surveyed reported having <br />to perform little or no regular <br />maintenance to their metal roofs. <br />Consequently, owners of metal roofs <br />said they spent less than 4% of the <br />total installed cost on maintenance <br />compared to 29% by owners of <br />built-up roofs and 19% by owners of <br />single-ply roofs. <br />Expected Life Cycle Costs <br />Metal Built-up Single-ply <br />The life cycle cost of a roof is <br />determined by computing the present <br />value of all cost associated with the <br />roof over its life, including annual <br />maintenance costs. The Ducker <br />analysis also factored in an annual <br />inflation rate of 3.1 %. <br />The study further confirmed that life <br />cycle costs for metal roofs, unlike <br />those for built-up and single-ply, are <br />consistent across all major commercial <br />construction categories, including <br />office, retail, institutional and industrial. <br />Not reflected in the analysis are <br />potential energy cost savings resulting <br />from the use of a reflective roof <br />system wish adequate insulation. <br />These savings could lower the <br />expected life cycle cost of a metal <br />roof by an additional 8 to 10 cents per <br />sq. ft., depending upon the region of <br />the country, building function and <br />insulation thickness. <br />Among the more intriguing findings <br />is that many of the roofs in the study <br />experienced leaks, but none of the <br />metal roofs leaked as a result of <br />No Leaks !n Metal Roofs <br />Due To Material Failure <br />The roofs analyzed by Ducker had, <br />for the most part, been in service for <br />more than 10 years at the time of the <br />study and had an average size of <br />92,000 sq, ft. Typical metal roofs <br />analyzed were 24 gauge standing <br />seam roofs that used standard <br />fasteners and a PVDF coating, while <br />built-up roofs were typically 3-4 ply <br />and single-ply roofs were made of <br />45 mil, non reinforced membrane. <br />The performance record of metal <br />roofs examined prompted owners and <br />property managers of these roofs to <br />report the highest level of satisfaction <br />with the"value for price paid." On <br />a scale of one to five (with five <br />representing the highest rating), metal <br />scored a 4.75 compared to 4.30 for <br />built-up and 3.91 for single-ply. <br />In line with the owner/manager <br />satisfaction rating, metal roofs also <br />topped the field in terms of customer <br />loyalty. When asked if they would use <br />the same roofing material in the future, <br />92% of the metal roof owners surveyed <br />said they would, compared to 46% of <br />the built-up owners and 58% of the <br />single-ply owners, <br />Maintenance <br />Percent of roof leaks es <br />result of material tailure <br />309~b <br />0% <br />Metal Built-up Single-ply <br />For additiona! information on the fife <br />cycle cost analysis, visiq~~j' <br />Initiative website at therr~~{ij{~,jiy~,~lg~l2 <br />Page 160 of 199 <br />
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