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Old 10-24-2018, 03:53 PM   #1
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Roof problems experience?

I have a 2014 Ventana 3436 Diesel which I purchased in March. I clipped a branch and took the top off my plumbing vent, while up there I noticed black specs everywhere. I scrubbed the whole roof with soap, water and a brush which lightened them up but didn't completely remove them. Since then I have tried denatured alcohol which Newmar instructed me to use as a cleaner for all the sealant before re-caulking them, which worked great. I tried several other solvents including the denatured alcohol (in a test spot), also fiberglass polishing compound, 303 protectant, clay bar and also Mequirs wax and besides the spots not coming off the fiberglass finish appears dull, not glossy. The other thing I noticed as I was scrubbing on my hands and knees were some places where the fiberglass didn't feel solid, not structurally but like pockets that seemed like they glued or weren't attached? Can anyone offer any suggestions or have any experience with this? All the forums I've read not one complaint about the fiberglass roofs having any such issues and one gentleman I talked to said the fiberglass sounded like it was "delaminated" where these pockets were which could be due to water penetration. When I resealed there was no evidence of a bad seal and I have no water stains inside. I have opened up both air units from the inside and inspected the penetrations and everything looks good. I'm hoping somebody might be able to shed some light on my question so I can start sleeping again some time soon.
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Old 10-30-2018, 08:51 AM   #2
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I have a Ventana Le with the same slight ripples in the roof fiberglass. Following your thread to see what others say. I believe mine is normal, but I did have to reseal the roof seams where they met the front / rear caps as they weren’t done properly at the factory. In theory water could have penetrated. I’m waiting for others to chime in.
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Old 10-30-2018, 10:47 AM   #3
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I had great luck with a Mr. Clean Magic Eraser Mop, and using just dishwashing liquid.
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Old 10-30-2018, 11:06 AM   #4
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The spots are not unusual, especially if the previous owner never cleaned or treated the roof. Remember, it's 5 years old and possibly never taken care of. Unless it really bothers you, I would wax and keep it clean in the future. If it does bother you, you might have to get aggressive with buffing compound.

Your roof was installed as one large single piece of fiberglass. It's got insulation under it and frame work. It's NOT bonded to foam core or wood. It's glued down, but not every square inch. So, when you walk on it, it's going to flex. It's tough for it to become delaminated, because it is one singular piece, unless you're seeing issues around vents or other attachments.
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Old 10-30-2018, 05:58 PM   #5
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Originally Posted by Dutch Star Don View Post
Your roof was installed as one large single piece of fiberglass. It's got insulation under it and frame work. It's NOT bonded to foam core or wood. It's glued down, but not every square inch. So, when you walk on it, it's going to flex. It's tough for it to become delaminated, because it is one singular piece, unless you're seeing issues around vents or other attachments.
Are you 100% sure of that. I keep hearing everyone say how Newmar uses a thick piece of fiberglass for the walls and roofs. Newmar lists this as a "composite" piece of fiberglass. When I installed a new microwave vent I found out that "composite" fiberglass sidewall is plywood (or luan) sandwiched between two pieces of fiberglass. There is definitely wood in my sidewalls. I'm 100% positive. I just wonder if there is any difference for roofs or other models in the Newmar line.
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Old 10-30-2018, 07:43 PM   #6
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Try using vinegar in those black spots. Sponge on, let sit for about 30 minutes, then clean with soap n water. The black spots are more than likely mildew. Vinegar will kill the mildew. Bleach will only turn it white, it doesn’t kill it.
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Old 10-31-2018, 10:34 AM   #7
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We watched them hang the walls and they let you touch the roof, as you walk by during the tour. There are usually about 6-8 of them stacked on top of each other. What I'm saying is, the one piece roof that they lift up on to the isn't glued down EVERY square inch. It can flex, as it's a sheet, not a 2" thick bonded unit. I'm guessing the sheets we saw were about 3/8" - 1/2" thick. I wish I had taken a photo of the roof during our factory tour.

Here is a picture of the exterior of the coach, before the insulation is installed. The insulation is not fiberglass, but looks and handles just like the rolled insulation you use in a house. Once the insulation is glued on, they run a bead of caulking (glue) on every piece of metal framing. Once it's glued up, they bring a long single sheet of fiberglass (about 1/8" - 1/4" thick), on a crane, and hang it over the side of the coach. One guy rivets it dead center at the top, they level it and he moves down the side installing rivets. Before he's even done, a guy is on the inside, drilling a hole at the four corners of the slide opening. Minutes later, someone else is saw cutting the slide opening. They remove that piece of material, mark the coach number on it and advance it forward to install on the exterior of the slide, once it's installed.


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