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 > Find cross pieces under metal roof to mount solar panel?

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joerg68

St. Ingbert, Germany

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Joined: 02/27/2009

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Posted: 03/16/21 02:02am Link  |  Quote  |  Print  |  Notify Moderator

On my 2002 Lance, the aluminum sheet roof was loose on top of a layer of plywood, with a thin layer of foam in between. It was not glued down as far as I could tell. That would exclude the no-screws method.

The roof on that camper could be walked on, so I would assume there was a decent layer of plywood (1/4" ?) everywhere. I know there is on my current Northstar camper.


2014 Ford F350 XLT 6.2 SCLB + 2017 Northstar Arrow


Bert the Welder

Van. Island

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Posted: 03/17/21 01:29am Link  |  Quote  |  Print  |  Notify Moderator

joerg68 wrote:

On my 2002 Lance, the aluminum sheet roof was loose on top of a layer of plywood, with a thin layer of foam in between. It was not glued down as far as I could tell. That would exclude the no-screws method.


Yep! That would be a problem.
Though, it may not be if there is little lift on the panels. Hell there might even be downward pressure, making them stick better! [emoticon]


"> 1998 GMC 2500, 10.5 Okanagan, My better/smarter half, George and Finnegan(APBT), all I need.


Geewizard

WA

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Posted: 03/17/21 06:23am Link  |  Quote  |  Print  |  Notify Moderator

bighatnohorse wrote:

In the event that you cannot find metal substructure I would submit for your consideration using well nuts.
They are inexpensive and you can fail-test them in your garage/work shop by installing them in 1/8-inch luan and attempting to pull them out.
They work.


I tried well nuts and they failed to hold my solar brackets to the degree I wanted.

I chose to use rivnuts (threadserts is another name) and specifically this rivnut kit.

Mine were inserted through the rubber roofing and luan into the hole I drilled in the roof's aluminum tubing. This has worked well for about 15 years.


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