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Old 05-20-2022, 02:13 PM   #1
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166FBS Spray Foam

This is our first travel trailer and admittedly the first time I did more than a passing glance at the undercarriage. I noticed this forward of the driver side rear axel. At first I thought it was mud or a bug nest, but it appears to be spray foam. Anyone else see this on their rig or have any idea why this might be here?
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Old 05-20-2022, 02:24 PM   #2
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Somebody went crazy with the gun or the trigger stuck... The dealer should have caught it before you even left the lot...
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Old 05-20-2022, 02:37 PM   #3
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You likely have the Arctic Package (we have a 166FBS) which includes tank heaters an extra insulation for colder camping trips. From what I have seen underneath our trailer, the spray foam insulation surrounds the plumbing to protect it from freezing. The way it is so liberally applied, it appears they use it for securing wires and such as well.

I have read that some folks use razors to remove the excess. Ours is not at the point it bothers me that much.
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Old 05-20-2022, 02:41 PM   #4
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Originally Posted by jbpeace View Post
This is our first travel trailer and admittedly the first time I did more than a passing glance at the undercarriage. I noticed this forward of the driver side rear axel. At first I thought it was mud or a bug nest, but it appears to be spray foam. Anyone else see this on their rig or have any idea why this might be here?
Excess spray foam to insulate openings in the underbelly. It is harmless.

What is potentially not harmless are the wires hanging under your axle quite low. Those are the brake electrical wires. I would zip tie them up. Otherwise you risk something on the road (or off road) catching on them.
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Old 05-20-2022, 06:05 PM   #5
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Bulging over use of spray foam is common, no need for concern.

As you journey about your new trailer, you will no doubt discouver other questionable construction practices; enjoy the journey!
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Old 07-06-2022, 11:40 PM   #6
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Excess spray foam to insulate openings in the underbelly. It is harmless.

What is potentially not harmless are the wires hanging under your axle quite low. Those are the brake electrical wires. I would zip tie them up. Otherwise you risk something on the road (or off road) catching on them.
Nice catch!!
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Old 07-07-2022, 09:42 AM   #7
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X2 on hanging wires to brakes.
Zip tie them up to keep road trash from pulling them out of the brakes, etc.

Make sure to leave enough play to allow for spring movement.


On the foam, Jayco hit some with to much, others left highways to heaven for mice.
Get under with a strong light and scour for other openings. Fill with metal, brass scrubbies, stainless steel or crumpled aluminum screen wire and foam or caulk into place. Helps prevent mice getting in, wasps nests, water spray, etc. getting in.
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Old 07-07-2022, 02:16 PM   #8
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This type of foam expands as it dry's. It is harmless and I would just leave it unless in interferes with something else.
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