Non-penetrating Roof Rack Ballast Questions [RE-wrenches]

[Jeffery Wolfe, Global Resource Options]

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Randy, 

While standard blocks have been used for years, we have also seen them
in various states of disintegration, becoming piles of sand in some
instances within 5 years. (both in PV and non-PV applications). This may
just be a "freezing / wet climate" thing. It varies greatly, even on one
job. But if the blocks do become sand, and sand blows or washes away,
what you've got is a non-ballasted ballasted system.

Bill is right that they are easy, and often used, and may be
appropriate. But we try to stay away from them at this point and use
either an attached solution or one of the growing number of
non-penetrating solutions. For the size array that you have, I would
suggest a pressure treated wood sleeper, fully flashed into the roof and
anchored well to structure. Then use a standard UniRac roof/ground tilt
rack with the feet anchored to the sleeper and waterproofed. Slope the
top of the sleepers if worried, and you'll have no leakage issues.

Jeff Wolfe
Global Resource Options
800-374-4494

-----Original Message-----
From: Allan Sindelar [mailto:allan at positiveenergysolar.com] 
Sent: Friday, November 04, 2005 10:17 PM
To: New wrenches posting
Subject: Non-penetrating Roof Rack Ballast Questions [RE-wrenches]

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Hi fellow Wrenches,

I need help with suggestions for ballast material for a non-penetrating,
ballasted flat-roof rack system using UniRac.  The roof pan dimension
are 9' x 4' with the 9' side being the front and back dimension.  The
module tilt angle is 20 degrees, leaving a space available for ballast
of between 2" in the front side to 18" in the back.  I need to add about
600 pounds of ballast to each rack.  Are there any practical ballast
materials I should consider to do this? What have you used successfully
that is permanent, practical, low-cost, and can be moved easily onto a
roof and into place?

Thanks for the help,



Randy Sadewic

randy at positiveenergysolar.com

Positive Energy, Inc.

3225A Richards Lane

Santa Fe, NM  87507

Phone 505 424-1112

Fax     505 424-1113

 

Enjoy the Sun!

[Non-text portions of this message have been removed]

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