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Old 03-27-2023, 05:18 PM   #1
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Rotted floor under fresh tank

On my 2018 Essex the floor under the fresh water tank is rotting out and has holes in it.Has anyone had this problem with their Newmar product?
Thanks
Randy
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Old 03-27-2023, 05:28 PM   #2
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The way the overflow has been set up on these coaches by Newmar sure seems to be a path to rotted flooring unless you did the overflow correction, which included extending the overflow tube.
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Old 03-27-2023, 11:08 PM   #3
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Sounds like leaking rear wheel wells when driving in the rain.
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Old 03-29-2023, 10:16 AM   #4
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No Help from Newmar.Does anyone know if the fresh thank can be removed from the pass. side of the coach?2018 Essex

Thanks
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Old 03-29-2023, 01:30 PM   #5
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Might be easier to replace the floor under the tank / plumbing instead of removing the tank to access the floor. If you are experienced doing fabrication, then an eyeball and tape measure is what it takes to advise what's the way to access and remove stuff.

Sorry don't have more specific info to share.
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Old 03-29-2023, 09:17 PM   #6
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Check rear fender well.I had holes in it. I removed tank and rebuilt floor .
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Old 03-30-2023, 08:03 AM   #7
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Quote:
Originally Posted by Mans Racing View Post
No Help from Newmar.Does anyone know if the fresh thank can be removed from the pass. side of the coach?2018 Essex

Thanks
I have a 2019 London Aire and I think yours is the same and yes, you would remove the pegboard or it my be your TV if you don't have a TV in your side wall. Here is a pic is with the pegboard removed exposing the tanks, when the plumbing and 2 hold down straps are disconnected they just slide out.
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Old 03-30-2023, 06:28 PM   #8
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You also have to get into the wet bay to remove tie down straps and disconnect some water lines
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Old 03-30-2023, 07:31 PM   #9
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I’m fully committed now.Floor is rotted with a big hole in it next to the wheel wells.I would like to post some pictures but I’m not smart enough to do it.Can anyone help me out with that?
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Old 03-31-2023, 05:42 AM   #10
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It is likely leaking at the wheel wells.This is a known problem at Newmar. I had the same problem with my 16 DS.
I recommend checking to see what type of insulation you have between the basement floor and the belly pan.Some early coaches used fiberglass batts for insulation between the floor and the belly pan that holds moisture and will rust the belly pan and basement frame rails.

With mine I first noticed small pin holes in the belly pan. Newmar diagnosed as a wheel well leak. Ultimately replaced the bulkhead between the wheel wells and wet bay, wet bay floor,entire belly pan. They removed all the fiberglass insulation and replaced with rigid foam insulation.
Also installed new HMW plastic wheel well liners and frame rail block off to seal the bulkhead.
Newmar had the coach for a week to repair and they agreed to repair at 50% of the cost. I’m very happy with the results and the coach is better than new.
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Old 04-01-2023, 08:11 AM   #11
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Here is what I found.
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Old 04-01-2023, 08:29 AM   #12
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Pictures are upside down.Well you can see what I’m dealing with.Why would you ever use OSB FOR This application?Going to replace with marine plywood. Got to cut everything out first and figure out where the water is coming in.
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Old 04-04-2023, 07:56 PM   #13
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NEWMAR 2016-2018 water leaks BIG need to read !!!!

Quote:
Originally Posted by Mans Racing View Post
On my 2018 Essex the floor under the fresh water tank is rotting out and has holes in it.Has anyone had this problem with their Newmar product?
Thanks
Randy
2015 - 2018 Newmar would get water in the space under floor of the bays.The water would get pick up by the tires in the rain and spray on the bottem of the floor and then run down the frame of the coach to the under belly of the coach the bottem under the bays floor. Then as you drive the water would get spalashed on the OSB WOOD (NOT PLYWOOD) and make it rot.
Newmar cut the bottem off our 2016 DS 4 times. Becouse it would hold 100 GAL of water under the bay floor beflore it would start leaking out.
Newmar now has put low point drains on the bottem of the skin of there coachs and use a new leak check system to try to stop the water leaks from the outside in.
AS a side note do NOT store you coach with a full tank of water it will sweat like a glass of ice tea on a hot summer day.
Recommendatation replace floor under tank with marine plywood NOT OSB.
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Old 04-04-2023, 08:15 PM   #14
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Need to look at water tank vent and over flow !!!

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Originally Posted by JC 4018 View Post
2015 - 2018 Newmar would get water in the space under floor of the bays.The water would get pick up by the tires in the rain and spray on the bottem of the floor and then run down the frame of the coach to the under belly of the coach the bottem under the bays floor. Then as you drive the water would get spalashed on the OSB WOOD (NOT PLYWOOD) and make it rot.
Newmar cut the bottem off our 2016 DS 4 times. Becouse it would hold 100 GAL of water under the bay floor beflore it would start leaking out.
Newmar now has put low point drains on the bottem of the skin of there coachs and use a new leak check system to try to stop the water leaks from the outside in.
AS a side note do NOT store you coach with a full tank of water it will sweat like a glass of ice tea on a hot summer day.
Recommendatation replace floor under tank with marine plywood NOT OSB.
Look at your pic's you have a water leak from the outside or the inside.
On top of the water tank is a vent and a hose that gose up and then gose down to the floor you need to over fill the tank and look for leaks and look at the auther side at the tank drain to see if it is leaking.Then look at the gray and black tanks when full.
Good luck hunting.
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