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Re: Standing Seam Metal Roofing Wind Uplift Calculations

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In my terminology:
Architectural panels are mounted on a substrate such as plywood or closely
spaced strapping with fastener clips every 12" - 24" +/-.
Structural panels are self-supporting, usually multi-span between
purlins/girts at 5' - 6' +/-.
Typically continuous cold-formed from coil but possibly formed from sheet.

Numerical analysis per AISI is a good start point for regular panels.
Watching a gage-thickness metal panel assembly during wind load tests really
makes one wonder how the idealized analysis even comes close. Discard any
thoughts of small deformations.

I conducted some verification tests on a 16" steel panel profile (vertical
ribs topped by a folded male-female seam) several years ago and the side
seams came undone like a zipper at low up-lift test pressures (AISI analysis
does not address this failure mode). It raised a few eyebrows because it
was/is a popular structural panel.


> From: "Oshin Tosounian" <oshin(--nospam--at)>
> To: <seaint(--nospam--at)>
> Subject: RE: Standing Seam Metal Roofing Wind Uplift Calculations
> Thank you Paul, 
> FYI, the project is in Los Angeles and it involves zinc roof and wall panels
> with standing seams that lap together at about 16" spacing (custom made).
> Whether you call these structural or architectural, they need to be shown by
> calculations and testing to meet the performance criteria set in the project
> specifications, including 30psf inward or outward wind pressure.
> Oshin Tosounian, S.E.

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