Decra Roofing [RE-wrenches]

[Matt Tritt]

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Mo and Owen,

I completely agree with Owen about this type of roof. Back in the early
80's it was called Typhoon Tile, and only came from New Zealand. We did
an install on this stuff - never again! All it takes is one mis-step and
Boink! You have a dented roof, which requires tons of labor to replace.
Also, finding rafters is close to impossible if you're going through an
existing roof under a roof.  

We do Unisolar systems (metal roofing) which always requires a grounded
roof, at least the sections with PV attached. With standing seam it's
not that difficult, plus it's all under cover so it doesn't look bad.
With this interlocking stuff with aggregate surface, how do you achieve
a secure ground? Hmmm?

Matt T

-----Original Message-----
From: Graham Owen [mailto:graham at solarexpert.com] 
Sent: Wednesday, April 21, 2004 6:38 PM
To: RE-wrenches at topica.com
Subject: RE: Decra Roofing [RE-wrenches]


 

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Mo,

Sunearth in sells beefy stainless hangar bolts.  I've never used them
but know of a number of 20+ year old heavy DHW panels still in service
mounted this way, on tile roofs, which have made it through significant
earthquakes.  I avoid these types of metal roofs for a couple of
reasons, it's next to impossible to accurately find rafter centers and
one miss-step and the roof is dented.  A few years ago I had a
particularly fussy inspector who made me ground every pipe under the
house including gas lines as well as install a new ground rod.  He
mentioned that I had covered the roof with aluminum and he had to cover
his ass.  I pointed to the metal roof next door and he stated I would
have to ground the entire roof and he strongly advised that I do not
install PV in his territory on metal roofs.

Graham

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