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We have an arena 60x150 that the metal roof has blown off twice. The back side in September and the front side last week. The winds reached about 70 mph. The first time the doors (one on each of the 4 sides were open due to tobacco airing the building. North side of roof blew off. This time 3 doors were closed (we were out of town) and the south side blew off. Should all doors be closed when a wind of this force comes up? Is there anything that could be used to further prevent this from happening again. None of the trusses were damaged. The metal will rip the purlin off and take the wood with it when it blows. Thanks for any and all help.
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Charley,
I would think that you would need a lot more fasteners and to achieve that, you may have to put some additional purlins in. It appears the spacing on the existing ones may be too far apart. Also, when you open the doors in a wind, you have greater uplift on the metal roof from the inside pressure of the wind moving through the building.
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Thanks for your input. This has been such an ordeal, twice in 5 months. We do not normally get this wind and are so unaccustom to it. Also, a Paslode gun was used to nail the purlin. They seem to become weak with time. We are now using the ringshank nails with the gun. They were not available when the building was built. This should help, shouldn't it? Thanks for your help.
2/17/2009
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2/19/2009
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