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asce-7 wind loading criteria

asce-7 wind loading criteria

asce-7 wind loading criteria

in your mind what should the size of the tributary area be when calculating wind pressure on a roof membrane?

RE: asce-7 wind loading criteria

Tributary areas of components and claddings are typically taken as the distance from the span supports times 1/3 of that distance.  On a fully adhered membrane, the "supports" are continuous, resulting in a ultr-conservative tributary area of 1 square foot.  However, for a membrane to fail in wind uplift, the entire area would have to uplift with it.  I would say a tributary area of 10' by 10' would seem appropriate.  Lastly, since it is not a structural member, it really falls on the architect (I'm sure he'll have fun trying to figure it out), or on manufacturer's testing data.

RE: asce-7 wind loading criteria

The tributary area for a membrane is the area affected or held by a fastener.  For example, most codes require one mechanical fastener for every 2 square feet of membrane/insulation area in the field of the roof.  This can be used as an equivalent for fully adhered membranes as well.

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