22:24 Jul 2, 2004 |
English language (monolingual) [PRO] Tech/Engineering - Construction / Civil Engineering | |||||||
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| Selected response from: Bourth (X) Local time: 13:22 | ||||||
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SUMMARY OF ALL EXPLANATIONS PROVIDED | ||||
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5 +1 | telegraphic! |
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Discussion entries: 1 | |
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i-60 wind uplift telegraphic! Explanation: I-60 is a standard of RESISTANCE to wind uplift, i.e. the pull exerted on a roof by a wind moving across it. Could also be phrased "that provides the NECESSARY stability and an I-60 wind uplift GRADING / RATING." -------------------------------------------------- Note added at 22 hrs 15 mins (2004-07-03 20:39:58 GMT) -------------------------------------------------- I don\'t know what \"I-60\" refers to exactly, nor does it matter. I doubt it refers to a roof pitch of 60°, but rather to some unit of measurement of the suctional force exerted by wind. -------------------------------------------------- Note added at 22 hrs 19 mins (2004-07-03 20:43:48 GMT) -------------------------------------------------- Got it! <<There are two common misconceptions associated with the FM [Factory Mutual (Factory Mutual Engineering Corp)] wind-uplift classifications. The first involves the number 1: The classification denotation is the numeral “1,” not the letter “I” as it is frequently referred to. Therefore, the correct pronunciation is FM Class 1-60 not FM I-60. The second misconception is what the uplift classes actually mean. The common misconception is that Class 1-60 can withstand 60-mile an hour wind speeds. This is incorrect. The determination is actually based on pounds per square foot of pressure that the system can withstand. This is determined during testing procedures. In this process, the complete roof system — including the deck — is secured to the frame of the wind-uplift test apparatus. During the test procedure, compressed air is slowly introduced below the deck in increments of 15 psf. If the sample maintains 60 psf for one minute without damage, it is classified as Class 1-60. The same procedure applies for Class 1-90, which must maintain 90 psf for one minute and Class 1-120, which must maintain 120 psf for one minute. >> |
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