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Re: Canopy Roof Wind Load

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For this type of roof you need to look at ASCE 7-95,  Table 6-6, and pay
particular attention to note 2.

Lew Midlam, PE
-----Original Message-----
From: CanitzCF <CanitzCF(--nospam--at)>
To: seaoc(--nospam--at) <seaoc(--nospam--at)>
Date: Sunday, May 17, 1998 12:50 AM
Subject: Canopy Roof Wind Load

>I'm presently working on a project for which I'm trying to
>dtermine the wind uplift pressure on a standing seam metal
>roof of a free standing entry canopy structure. The structure
>is free standing and is approximately 73'x46'x25' high. The roof
>is monoslope(approximately 10 degree slope). All four sides of
>the structure are open. Per ASCE 7-95, I'm designing for cladding
>of a monoslope open structure. The wind speed is 90 mph, Exposure
>Category C and an Importance Factor of 1.00. The surrounding
>terrain is not a factor.
>When I calculate the roof wind load, the value is only 10 psf(based
>upon p = qz*G*Cf). This implies very little, if any, uplift. Based on past
>experience, this seems unrealistic. Therefore, my question is the roof
>of this type of structure normally subjected to very little uplift due to
>absence of walls?
>Thanks in advance.
>Charlie Canitz, PE
>Bel Air, MD