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<blockquote data-quote="Jay Barracato" data-source="post: 130546" data-attributes="member: 24">Re: Is this structure safe?Too many people disregard possible wind load. They look at a roof and say, its not that heavy, just some truss and canvas.But some &quot;back of a unopened junk mail mail&quot; calculation shows that a 20 mph wind at 30 ft above the ground in a generally open area may add up to 4000 lbs of force on the structure in just about any direction. If the wind were to gust to 60 mph that force could jump to 40000 lbs.I have seen gust fronts blow every directions from straight down to bouncing off the ground and blowing straight up, so a structure would have to resist that in literally 360 degrees.I am not involved in building these big stages enough to know if this exists, or if it is a regular practice, but I would like to see a roof skin engineered to tear away at a wind velocity low enough that it doesn&#039;t threaten the rest of the structure.Sent from my DROID RAZR HD</blockquote>

[QUOTE="Jay Barracato, post: 130546, member: 24"] Re: Is this structure safe? Too many people disregard possible wind load. They look at a roof and say, its not that heavy, just some truss and canvas. But some "back of a unopened junk mail mail" calculation shows that a 20 mph wind at 30 ft above the ground in a generally open area may add up to 4000 lbs of force on the structure in just about any direction. If the wind were to gust to 60 mph that force could jump to 40000 lbs. I have seen gust fronts blow every directions from straight down to bouncing off the ground and blowing straight up, so a structure would have to resist that in literally 360 degrees. I am not involved in building these big stages enough to know if this exists, or if it is a regular practice, but I would like to see a roof skin engineered to tear away at a wind velocity low enough that it doesn't threaten the rest of the structure. Sent from my DROID RAZR HD [/QUOTE]

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