Good Sam Club Open Roads Forum: Travel Trailers: What causes soft floors
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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > What causes soft floors

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mkenyon2

Lebanon, PA

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Posted: 10/11/21 04:33pm Link  |  Quote  |  Print  |  Notify Moderator

What causes soft spots in floors? What can be done to prevent that? How serious is it?

I'm guessing soft spots are areas where the subfloor (plywood or OBS) has gotten moisture and weakened. I'm wondering if it happens more when parked on a grassy lot vs a paved area?

I also understand that how serious it is is subjective to the area that's gotten soft and the model of trailer.

My question comes up as I look for a used travel trailer and have seen some nice ones with soft spots.


MK out of PA and My Wifey
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Trailer: 2013 Heartland Trail Runner 25 SLE

We've only camped in 2 states? Quick, pack the trailer we have to CAMP!


jdc1

Rescue, Ca

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Posted: 10/11/21 04:45pm Link  |  Quote  |  Print  |  Notify Moderator

Yep. Dryrot. Usually found under sinks, in front of shower/toilets, and sometimes a window or vent left open. Very seldom does it happen from below.

Mfan

Otsego,Mi

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Posted: 10/11/21 04:46pm Link  |  Quote  |  Print  |  Notify Moderator

Could be the construction method too. I've seen the floor have a sheet of Styrofoam between 2 sheets of plywood. Hallway was spongy

Lynnmor

Red Lion

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Posted: 10/11/21 04:51pm Link  |  Quote  |  Print  |  Notify Moderator

Some RV floors have a sandwich type of construction where foam is in the center. That type can weaken with use till there is a total failure.

Others use a plywood or OSB material that will fail if it gets wet.

The repair for each type is complete replacement of the affected area. Search for videos that will help you with the project.





Fisherman

Angus, Ontario, Canada

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Posted: 10/11/21 06:50pm Link  |  Quote  |  Print  |  Notify Moderator

Bad design and use of interior low cost material.

mobeewan

Hampton, Va

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Posted: 10/11/21 09:36pm Link  |  Quote  |  Print  |  Notify Moderator

There is what feels like a "soft spot" in the floor of my trailer. It is the only spot in the floor that flexes slightly as I step on it. It is an unsupported seam where 2 pieces of 3/4" plywood flooring come together.

The seam crosses over the heat duct which runs down the center of the trailer. The duct is stapled directly to the underside of plywood flooring. It does make the center isle warm for the feet when getting up in the morning or getting up to go to the bathroom at the back of the trailer when winter camping.

GrandpaKip

Flat Rock

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Posted: 10/12/21 08:12am Link  |  Quote  |  Print  |  Notify Moderator

Our camper has a sandwich floor and there is a tunnel in it for wiring to go to the other side from the load center. It definitely deflects when stepped on but hasn’t gotten worse over the years.
You may be seeing the same thing in some of the units you have looked at.


Kip
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1320Fastback

Vista, Ca

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Posted: 10/12/21 10:10pm Link  |  Quote  |  Print  |  Notify Moderator

I am sure some manufactures use CDX or OSB3,4 plywood but the floor I had to fix in our 2016 Sand Sport was neither of those. I suspect it was OSB 1or 2 both of which are not water resistant. There is nothing wrong with OSB category 3 or 4 in wet locations.


If you feel a soft spot in the floor the plywood has rotten from repeated water intrusion.


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Vintage465

Prunedale CA.

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Posted: 10/18/21 05:58pm Link  |  Quote  |  Print  |  Notify Moderator

I noticed on mine there is a section right in the kitchen that is not as solid as the rest of the coach. Turns out that's right where the black water tank is...meaning there is not a cross beam between the frame rails for the width of the black tank...about 4 feet. So in that area, as far as I can see the 2x2 with 3/4" tongue and groove float happily over that span.


V-465
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kellem

Shenandoah valley,VA

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Posted: 10/19/21 04:58pm Link  |  Quote  |  Print  |  Notify Moderator

Worse case scenario is a roof leak....water seeping down the walls and absorbed by floor.
When looking at used trailer's it would be prudent to avoid any and all trailer's that have soft floors. Imo

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