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Old 03-13-2019, 03:32 PM   #1
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Solar panels on fiberglass roof

Does anyone have experience with attaching solar panels to a fiberglass roof with VHB tape or another alternative? I don't want to drill holes and am concerned about the issues with directly attaching flexible panels.
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Old 03-13-2019, 03:59 PM   #2
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VHB tape

I attached my solar with these drill free panel holders.

https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1

I used VHB tape and they seem very well attached when done. It was my first experience with VHB tape and I am told it holds up. But for my own piece of mind after install I put 1 screw in the forward holders only, as a little extra security. 1 screw through the VHB should be a good seal anyway , plus I added some silicone sealant to the screw. No chance of a leak.

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Old 03-13-2019, 04:37 PM   #3
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Mine are mounted with stainless screws to fiberglass roof.

Put down a puddle of Dicor, put the mounting bracket in the puddle, drive the screws, put some more Dicor over the top of the screws. Done. Won't leak.
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Old 03-13-2019, 04:45 PM   #4
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Quote:
Originally Posted by vsheetz View Post
Mine are mounted with stainless screws to fiberglass roof.

Put down a puddle of Dicor, put the mounting bracket in the puddle, drive the screws, put some more Dicor over the top of the screws. Done. Won't leak.
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Old 03-13-2019, 10:20 PM   #5
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Mounted my panels in 2015 with 2Ē wide 3M VHB tape #5952, then put a bead of dicor around each foot edge to keep out water intrusion...thatís it. I did drill a hole in each foot and filled it with dicor just in case down the road I felt it needed a screw to augment the tape...so far after 20K miles no screw needed and their still up there.
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Old 03-13-2019, 10:48 PM   #6
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Attached unistrut to coach roof with VHB tape on several motorhomes, and then bolted the panels to the unistrut. No holes in the fiberglass. Added bonus, if you want to upgrade or add panels, just bolts to remove, and change out panels. If room, buy 10 or 12 ft sections to allow for future expansion.
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Old 03-14-2019, 11:27 PM   #7
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3M makes a primer to help it stick. Primer 94
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Old 03-14-2019, 11:36 PM   #8
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3M makes a primer to help it stick. Primer 94
Good to know, I used simple green and then alcohol, will try primer on my next install.
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Foretravel tag axle 40 ft. 500 hp/1550 ft/lbs ism 1455 watts on the roof. 600 a/h's lithium down below.
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Old 05-23-2019, 08:10 AM   #9
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Just a follow up question: is 5952 the accepted standard here or are there several other VHB products that have been used successfully? There are so many VHB products and I read somewhere here that 3M wont comment on adhering solar panels to a fiberglass RV roof, but after viewing the 3M videos about using it for trailer construction and side panels on busses, it seems like the right material. I really don't want to drill holes in my roof.
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Old 05-23-2019, 09:54 AM   #10
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I called 3M and asked that. Was told it is not recommended because they have never tested it for that purpose. Also said that 5952 is the best one for fiberglass roofs with primer. There are 2 primers and 94 is the best so I only listed and remember that one.
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Old 05-23-2019, 11:03 PM   #11
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Perfect, thanks!
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