pre-engineered ground racks [RE-wrenches]

Bill Brooks billb at endecon.com
Thu Sep 9 14:41:00 PDT 2004


 

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William,

Mixing and matching structural components is a big no-no to start with. I
know that many installers like to take the best of each company's products,
but this is not the right way to do it anyway. DPW has there way that works
with their products and Pro Solar has there own. If you want any kind of
engineering backup, you have to use the product as specified by the
manufacturer.

I think every structures manufacturer has room for improvement in supplying
good engineering information for inspectors. My opinion is that they all
should take their products to the International Code Council's Evaluation
Service. For a fee, they review the product and provide a writeup that all
member inspectors have access to. Most inspectors view this as automatic and
would pass these systems without hesitation. Too often we are faced with
having to provide justification for equipment that doesn't neatly fit the
way inspectors normally operate. I think it is the PV industry's fault and
it is a hastle for installers.

Bill.

-----Original Message-----
From: William Miller [mailto:wrmiller at slonet.org]
Sent: Thursday, September 09, 2004 10:31 AM
To: RE-wrenches at topica.com
Subject: RE: pre-engineered ground racks [RE-wrenches]



At 10:11 AM 9/9/2004, Graham Owen wrote:
>standoffs.  That said; lets compare the flashable standoffs; Pro Solar's
>"Fast-Jacks" will fit both an Oatey rubber boot flashing as well as
>standard all metal flashings.  The new Uni-Rac aluminum standoffs fits
>well under an Oatey flashing but will not allow a metal flashing to be

Graham:

I used the Fast Jacks on one installation and I was very concerned at the
structural integrity of a stand-off mounted with only one lag.  The jacks
were very wobbly.  This might be because we put more stress on the
stand-offs because we use Direct Power tilt-up racks (we don't use quick
connects).  When tilting up the racks, there is more strain on the lower
stand-offs.  Occasionally we will put a temporary N-S strut between
stand-offs to prevent lag pull out.

We use the Direct Power "Power Posts."  These are very solid and mount with
two lags.  It took some research to find roof jacks we like, but the Oatey
11830 and 11831 work great on the Power Posts.

We have about 50 Fast Jacks we won't use, and we could make you a deal on
them...

William Miller

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