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Old 06-23-2016, 11:16 AM   #15
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Location: Motor City, Mich
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Again, the roof "supports" seen in the image from Winnebago (at the green X's) are nothing you could screw into. They are simple, flat sheet steel. Not I, H, C, or L shaped, they are flat, and sit vertically. They support nothing, the strength of the roof is in the laminated sandwich of foam and plywood. The metal bows are shown in detail in the prints Winnebago will send you. I can see one of mine above one of the lights in my bedroom.

And as far as screwing or gluing to the fiberglass, it's a very thin sheet, less than 0.040". It's not bonded to the 1/8" plywood underneath it, just laying there. It's only held down at the edges. (Search for Winnebago roof blowing off and you'll find a lot of info.) That's one of the reasons why I elected to bolt my antenna through the roof.


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Old 06-23-2016, 11:24 AM   #16
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Thanks Tim, I'm with you, and was with you, but I didn't get that the fiberglass was that thin with no support under. I see why you did what you did with the plates and it definitely looks like the way to go if I can get in through air duct holes. By using the Yakima track type stuff I was just thinking of a very strong adhesive to lay it and screws through the fiberglass every few inches. That track has a lot of screw holes and I could make more if needed. Anyway, your way sounds a bit better and like it will also strengthen a 'floating' roof. I have not had a fiberglass roof RV before but it certainly seems sturdy. There is no flex while walking around it like there has been on every other (rubber) roof RV I've had.

Another idea I have is to just go all the way through the ceiling and put big washers/plates inside the cabinets. My rig has upper cabinets above the streetside bed across the back and up the side, then a big closet. I don't mind the plates and bolts being exposed inside the cabinet, and it would surely simplify checking on them on occasion for tightness.

Thanks! I'm definitely still looking for different ideas on this.

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Old 06-23-2016, 11:42 AM   #17
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I like the washers/plates in the cabinets approach. Paint them white, never see them. Just remember that you will be able to tighten them forever, foam will just squash. Tight enough is tight enough.


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