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Old 01-19-2019, 03:45 PM   #1
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Access holes cut in underbelly?

So long story short. There was a bunch of things wrong with the brand new 5er we bought. Took it in to get it fixed. It has an inclosed underbelly. They cut access holes and patched them. Is this expectable for a new trailer. Thanks. Any input would be helpful
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Old 01-19-2019, 03:56 PM   #2
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The sad answer is YES. Anything is possible to be a problem on any new RV. If something went wrong on your new 5er and you took it to the dealer and they actually fixed it under warranty... properly... in a reasonable time then THAT is the unexpected thing that has happened.

PS. It’s always best to add more pertinate info to your subject line than “Please Help.”
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Old 01-19-2019, 03:57 PM   #3
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So long story short. There was a bunch of things wrong with the brand new 5er we bought. Took it in to get it fixed. It has an inclosed underbelly. They cut access holes and patched them. Is this expectable for a new trailer. Thanks. Any input would be helpful
Finding a bunch of things wrong has not been my experiance. As for cutting and patching the holes, that happens to be the only way to access some of the plumbing.

Get it repaired and enjoy your trips.
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Old 01-19-2019, 04:02 PM   #4
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It was leaking from the sink drain. They forgot to glue a fitting. No heat in bedroom. There was a crushed pipe. Now we have a bunch of patch holes in the underbelly
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Old 01-19-2019, 04:12 PM   #5
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It was leaking from the sink drain. They forgot to glue a fitting. No heat in bedroom. There was a crushed pipe. Now we have a bunch of patch holes in the underbelly
The real question is: did they fix the leak and crushed pipe in a timely manner?
Cutting and patching the underbody covering is standard practice to get access.
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Old 01-19-2019, 05:02 PM   #6
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It would not be acceptable to me. You most likely have coroplast under your trailer. It is usually attached with self tapping screws, although some newer trailers are using pneumatic nailers. Even if they used the nailers it is still easy to remove. They just took the easy, cheap, and fast way out. Would you be ok with them doing the same on your roof?
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Old 01-19-2019, 05:29 PM   #7
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Roof is a whole different animal.....every dealer will access thru the coroplast.....proper way to cut in is a 3 sided door, with the hinge being toward the front......
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Old 01-19-2019, 05:45 PM   #8
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While much more exposed, the roof is not so different. Lots of water spray hitting the coroplast when the roads are wet. When the tape quits sticking how long will it be before you notice it? How many rodents will use it for a door to their new house? Not every dealer will cut the coroplast, just the crappy ones, of which there are many!
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Old 01-19-2019, 05:53 PM   #9
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You will now need to check it every 6 months or more to make sure the tape is still holding on the patches.

The same kinda thing happened to me. Was I happy, NO. Was there anything I could do about it...Yes. I couid check it 6 months or so to make sure the tape was still holding on the patches.

That tape will come off, especially if towing it. I tried gorilla duct tape. It worked for a year then new gorilla duct tape.

Anyone know the very best tape to use?
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Old 01-19-2019, 06:12 PM   #10
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You will now need to check it every 6 months or more to make sure the tape is still holding on the patches.

The same kinda thing happened to me. Was I happy, NO. Was there anything I could do about it...Yes. I couid check it 6 months or so to make sure the tape was still holding on the patches.

That tape will come off, especially if towing it. I tried gorilla duct tape. It worked for a year then new gorilla duct tape.

Anyone know the very best tape to use?
I used woven finerglass material cut to cover the whole or cut and spray adhesive. Bought it as a kit on the internet.
https://www.google.com/url?sa=t&sour...=1547943099719
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Old 01-19-2019, 06:34 PM   #11
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You will now need to check it every 6 months or more to make sure the tape is still holding on the patches.

The same kinda thing happened to me. Was I happy, NO. Was there anything I could do about it...Yes. I couid check it 6 months or so to make sure the tape was still holding on the patches.

That tape will come off, especially if towing it. I tried gorilla duct tape. It worked for a year then new gorilla duct tape.

Anyone know the very best tape to use?
I had to cut mine to repair a black tank dump valve. To repair I use some thin wood door shimes and use 3\4 in screws. Screw the 3 sided cut to the wood shim as a backer. Just like you would a smmall sheet rock repair. Then I wiped the plastic edges with alchol and then used gorilla tape. That was 3 years and about 8000 miles ago.
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Old 01-19-2019, 07:08 PM   #12
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Owners,Dealers, Mobile RV Repairmen have been doing that since trailers started having enclosed underbellies.


Before that ALL trailers were wide open exposed to elements, road hazards and rodents....many still are.


Not all underbellies are installed using self tapping screws. Some are 'power shot' nails using a RAMSET



IF really worried......use eternabond tape to seal the cut underbelly
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Old 01-20-2019, 04:05 PM   #13
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Locate the cross beams, wood or metal, get self-drilling screws with fender washers to hold everything in place. Good tape also.
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Old 01-20-2019, 08:20 PM   #14
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our mobile rv guy told us how they do it. the cut a section out. then they take some flat roof flashing and use self tapping screws to screw it in around the opening so that it overhangs into the opening. then they take the piece they cut out and put it back into place and use self tapping screws into the overhanging flashing. then tape over the screws and seams.

i found some tape on the internet called 'underbelly tape'. it is not cheap. it is thinner than gorilla tape but has some pretty good glue on it. they tell you to clean the surface of the coroplast where it is going to be taped with isopropal alcohol. i have had some of for three years now and its still there.
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