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Old 07-28-2016, 08:09 AM   #11
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Screw Size

I'm installing solar panels on FR3 roof this weekend. Can not find anything that tells me the length of screw recommended for installing the panel brackets.

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Old 07-28-2016, 09:21 AM   #12
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Unless you are 100% certain you are going to hit framing for the roof do not use any type of construction screw to hold the panel down. The sheathing is very thin and does not provide enough bite for screws to hold. If you have a fiberglass roof many people have had good success with adhesives. If it is a rubber, EPDM, or TPO roof you will need some type of anchor (well nut, toggle bolt) to secure the panel.
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Old 07-28-2016, 09:56 AM   #13
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Thank u

I was afraid of that.
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Old 07-28-2016, 10:30 AM   #14
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I used well nuts. Here is what I did:
-mark locations for the holes.
-Drilled holes. CAUTION: I have a TPO roof. The TPO membrane is very thin and the drill bit will pull it up around the hole. Drill a hole in a thin scrap of wood. Line this up with the location for the hole in the roof. Keep pressure on the wood to minimize the roof membrane getting pulled up by the drill bit.
-Put lap sealant in the holes and surrounding area where mounting brackets will contact roof.
-Insert well nuts and bolt down the brackets. Apply downward pressure to the brackets so that the well not does not pull out of the roof before it has expanded.
-Apply generous amount of lap sealant over and around the mounting brackets.
-Install panel.

The lap sealant can be a bit messy so be prepared with wet rags for clean up.
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Old 07-28-2016, 12:52 PM   #15
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Why would you not use a leather punch cutter to make a clean hole in rubber so the drill bit doesn't touch rubber.
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Old 07-28-2016, 06:13 PM   #16
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Dumb Question

So there is nothing underneath / Plywood or ?

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Old 07-29-2016, 10:41 AM   #17
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StephanFR3 - good idea. I did not think about that.

Bearister - the plywood underneath is only 3/8" (maybe thinner). I would not trust construction screws to hold for several years of driving at 65 MPH.
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Old 07-29-2016, 10:50 AM   #18
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Thank U

Is there room for a molyplug ?

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Old 07-29-2016, 11:08 AM   #19
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Not sure what a molyplug is.
There should be 2-3" between the roof and the ceiling inside. The type of insulation under the roof might affect the type of anchor that will work. Block foam insulation might be a problem but fiberglass probably not so much.
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Old 07-29-2016, 11:49 AM   #20
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X2. Well nuts are perfect for this and they have them at Home depot and Lowes.
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