S-5 clamps [RE-wrenches]

[Peter Parrish]

Marco,

We have installed just one system using S-5 clamps on a standing seam metal
roof, and I tried to research just the question you are pondering. I also
got nowhere. 

This may be a clue to the lack of data. When I inquired I was told that the
clamp-to-seam perpendicular pull out strength would typically exceed the
strength of the attachment of the metal roof to its underlayment. In other
words, if the wind is strong enough everything will become a kite: PV, S-5
and the metal roof -- and whatever pieces of the underlayment come along for
the ride.

Hardly a reassuring engineering approach.

- Peter

Peter T. Parrish, Ph.D., President
California Solar Engineering, Inc.
820 Cynthia Ave., Los Angeles, CA 90065
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
CA Lic. 854779, NABCEP Cert. 031806-26
peter.parrish at calsolareng.com 

-----Original Message-----
From: Marco Mangelsdorf [mailto:marco at pvthawaii.com] 
Sent: Saturday, March 10, 2007 10:40 AM
To: RE-wrenches at topica.com
Subject: [Norton AntiSpam] S-5 clamps [RE-wrenches]


For those of you who have used S-5 clamps to attach module mounting
hardware, have you ever come across or had calculated the attachment value
of this method in terms of what windspeed they can handle?  Our friends at
the S-5 clamp website are none too forthcoming with this kind of important
info.
 
thanks,
 
Marco Mangelsdorf, Ph.D., President
Electrical Contractor License C-26351
69 Railroad Avenue, A-7
Hilo, Hawai'i 96720
(808) 969-3281, 934-7462 facsimile
www.provisiontechnologies.com


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