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Old 09-22-2016, 06:46 AM   #1
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Solar Panels on Fiberglass Roof?

Opinions on how best to attach solar panels to our fiberglass roofs? Alpine roofs are vacuum laminated with thin layers of fiberglass and plywood on the top sided. Panel manufacturer recommends minimum 3/8" thick sub-surface. Our roofs have aluminum cross-members but unlikely any of them would line up with panel brackets. Panel install kit came with wood screws [two per bracket/four brackets per panel]. Have been reading about VHB tape--any experience with it? Assume some sort of surface prep is required?
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Old 09-22-2016, 07:54 AM   #2
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I mounted my two 100 watt panels with stainless wood screws and RTV under the brackets, with a layer of RTV over the top of the screw heads. They have been there for three years with no issues. Cleaned the fiberglass with alcohol prior to installation.
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Old 09-22-2016, 11:31 AM   #3
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Five additional solar panels installed by D & R R.V., Glendale, AZ, ten years ago using similar technique as mentioned by Rich and Cork with absolutely no problems. I believe D & R used Dicor self-leveling sealant for attachment and sealing in lieu of RTV under the brackets. Prior two Fleetwood coaches where I installed multiple panels on a fiberglass and a rubber roof using identical attachment method as D & R and never experienced any problems.
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Old 09-22-2016, 12:03 PM   #4
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When I installed my panels on my fiberglass roof, I used 3M 5200 Fast Cure under each of the four brackets per panel, and put one screw in each bracket to keep the panel from sliding until the 3M 5200 cured.
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Old 09-22-2016, 02:08 PM   #5
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I would recommend AGAINST 3M 5200 for anything that may need to be removed in the future.

Never saw a solar panel that could not fail, particularly if helped by falling limb, etc. So it MAY have to come off.
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Old 09-22-2016, 02:11 PM   #6
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Quote:
Originally Posted by wolfe10 View Post
I would recommend AGAINST 3M 5200 for anything that may need to be removed in the future.

Never saw a solar panel that could not fail, particularly if helped by falling limb, etc. So it MAY have to come off.
My panels are not permanently fastened to the mounting brackets. Actually, I can tilt my panels left or right, or if one fails, I can simply remove it, and replace it with an identical panel.
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