Call unirac; find a structural engineer who is green in the good sense
(not cents); get specs from the truss manufacturer; speak with his boss.
Sent from my iPhone
On Dec 4, 2009, at 5:55 PM, Rebecca Lundberg <[email protected]
> wrote:
Solar is somewhat 'new technology' where I live. :-) I have a
building inspector that feels that (32) Sanyo modules (6.88 kW
array) mounted to a house roof is going to cause undue stress to the
roof truss (it is a regular house in a Minnesota suburb, building
height is 26', 30 degree roof angle, in a suburban neighborhood. 2"
x 4" manufactured truss). We are leaving 12-24" on each edge with no
PV, and are careful to attach to the center of each rafter.
The inspector is not that concerned with dead load, but is
especially concerned with wind load. We have provided an engineering
letter that ascertains that a solar array mounted parallel to the
roof surface is well within the parameters of what a typical roof
truss can handle. We were required to have an engineer look at this
address specifically, so we then provided an additional engineer's
letter that affirmed that yes, solar mounted in the manner we
proposed (with Quick-Mount attachment and Unirac SolarMount rails,
all installed according to manufacturers' instructions) would be
fine on this home. The building inspector insists that the wind load
is excessive, and wants more analysis. Do any of you have ideas,
experience, or data that might help me?
Rebecca Lundberg
Powerfully Green
Champlin, MN
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