panels on a bowed roof [RE-wrenches]

[Allan Sindelar]

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Kirk,
UniRac's standoffs can be custom-made in any combination of lengths you
require. We have done this for roofs where we had to dig through a foot of
pumice and rigid insulation (they do things different in New Mexico).
Contact Steve Fain at UniRac for details.
Allan at PosE

----- Original Message ----- 
From: "Kirk Herander" <kirk at vtsolar.com>

Thanks for your good advice.
To be clear, this is not to compensate for an old sagging or warped
roof.
>From a side view, the roof is not a straight slope but rather a long,
sweeping arc, the slope of which varies depending on the height of the
roof you're at. Call it a bell curve, sort of. It has a name
architecturally, but I forget it. The challenge is to create an
evenly-sloped rack to mount panels which is "tangent" to the arc and at
proper tilt angle at point of mounting.
After looking through some catalogs, I found that unistrut makes a 6"
strut welded to a 2 hole mounting plate. They also make a hinge. So the
tangent can be made by bolting one end of the hinge to the top of the 6"
unistrut mount, then bolt unistrut rail to the top end of the hinge (2
feet per rail). The rail is the tangent line running up/down the roof.
Several of these rail assemblies across the roof form the base to bolt
on horizontal unistrut rails and problem solved. I hope.

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