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Subject Topic: Weight of caravan wall making floor sag Post Reply Post New Topic
24/9/2019 at 4:30pm
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Hi everyone

We have purchased our first caravan, an Elddis GTX Typhoon 2000 as a "fixer upper". When we viewed it, we thought the floor had been pushed up by the n/s wheel hitting a pothole, as it was apparent that the base units had become detached from the wall inside, and no longer aligned.

However on further inspection, it turns out that more than half of the screws securing the wall to the floor of the caravan had sheared, and the wall had been bouncing up and down on the remaining screws!

Thankfully apart from a few small areas of rot on the wall and floor batten the areas are sound, so I've chocked the walls up and put double the number of new screws back in. The o/s is sound (but has also dropped slightly), but I will add new screws to be on the safe side.

The issue I have is despite re-fixing everything, the floor has obviously been weakened as the n/s wall is slowly sinking again, which is pushing the edge of the floor down. Its worse around the middle of the van around the wheel arch.

Elddis refuse to provide any information regarding the construction of the floor, so I'm in the dark as to whether there are lateral timber supports within the sandwich construction.

Would performing a delamination repair across the width of the whole floor provide sufficient strength to stop the floor sagging again as I guess its possible the bonding has failed, or will I need something more substantial? The overhang from the chassis to the wall is only 12 inches where the sagging is the worst.

Any advice is very much appreciated!


24/9/2019 at 8:38pm
 Location: West country
 Outfit: Mondeo
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I've not had to do a repair like this so only guessing.

I would expect the floor to be plywood top and bottom with foam sandwich construction. The floor will be laid and supported on the chassis.

The furniture units will be fitted before the walls and they will be fixed to the floor. This will allow all the plumbing and wiring etc to be easily installed.

The walls will be added last and will be supported to the edges of the floor and the furniture units.



24/9/2019 at 9:23pm
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Hi navver, and many thanks for the reply. It sounds like I will need to rip out the kitchen units which includes the heater, fridge and cooker to get to the problem area. The other side isn't quite so bad as its only bunks etc.

If I can get the floor re-bonded, then this in theory should add some rigidity back.

Another thing I've notice is the floor is level from the bathroom at the rear to the section of the ALKO chassis where it bends inwards to form the A frame, and from this point the floor slopes downwards to the front of the van. Is this normal?


24/9/2019 at 9:48pm
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the walls are normally fastened to the floor with a tongue and groove joint.. glued and screwed..

if the joint between wall and floor has failed screws will not be strong enough..

trog


25/9/2019 at 7:27am
 Location: Yorkshire
 Outfit: Car & Caravan
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Is the wood still strong enough to support the screws, could this be the problem, I do hope not as this is usually caused through water ingress as in damp


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25/9/2019 at 11:25am
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Thanks for the replies trog100 and Paul_B, I think I've found the root cause of the issue.

The floor to the rear of the axle is dead level (when I parked the van up I used the floor inside the door as a reference for the spirit level), but the floor forward of the axle definitely slopes downwards (in the middle of the van over the chassis rails), sufficiently enough for the bubble in the level to move completely out of the "flat" lines on the level.

Subsequently when using a laser level last night, the bottom of the sides of the van slope to the front, which has put the pressure on the floor over the wheel arches (which is in the middle of the van).

As the chassis rails rear of the axle are only 12" from the outside edge of the wall / floor junction, the floors hasn't dropped significantly. However, where the chassis forward of the axle bends inwards to form the "A" frame, there is less support for the floor as the gap between the outside edge of the wall / floor junction and the chassis is that much greater. This is where the floor bends downwards.

With no outriggers on the chassis, and the walls being inflexible, the floor is being forced downwards in the middle of the van, which coincides with the location of the wheel arches.

Having secured the walls to the floor again, and the wood being sound (there is no tongued and grooved arrangement) something is causing the van to try and bend in the middle it seems. Is it possible that over time the chassis could have flexed from all the bumping of our wonderfully maintained roads? I've briefly checked the bolt locations where the axle is bolted to the chassis and there is no signs of cracking, and there is no obvious distortion to the chassis rails.

I could try and undo the bolts slightly at the axle bracket whilst supporting the weight of the van by chocking under the walls front and back whilst supporting the axle to see if this makes a difference?

The fact that the drop is uniform on both the n/s and o/s tends to suggest something to do with the chassis.

Does anyone else have any suggestions from previous encounters as to what the issue may be, and how to fix it?


25/9/2019 at 1:40pm
 Location: West Yorkshire
 Outfit: Bessacarr Cameo 625 2011
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I think I understand your description. Caravans have the furniture and appliances around the perimeter. These are heavy in themselves before we load them up with our belongings.

Over time the strip of floor between the sidewall and the chassis rail gradually starts to bend down under the effects of the above weight and its being amplified by road shocks. Of course any deterioration of the floor to sidewall joint will exacerbate this.

This effect is easily visible if a worksurface slopes slightly down towards the sidewall. A caravan tech pointed this out to me once, and my previous van showed this for quite a long time till I traded it.

You seem to have a fairly extreme version of this, but not having made such a repair I regret not having a solution for you.


25/9/2019 at 2:23pm
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Thanks chrisn7, I'll get the body chocked up level tonight so the weight is resting on each corner and the axle (with the wheels removed).

It won't be used before next season, so I have a fair amount of time to work out what I can do.



via mobile 26/9/2019 at 7:52am
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Okay, so I've got the caravan 100% level all around and supported in 3 places along each side where the walls have no openings above the support points. It's quite clear that the floor has lost all its strength as it's flexing a lot. I need to keep lifting the van until the floor edges are level again and let it sit for a while to re-establish it's equilibrium.

The question I have is will a delamination kit provide sufficient strength back in the floor to make it rigid again? I propose doing the whole floor forward of the axle, and extend rearwards of the axle by a couple of feet.

Would anyone recommend the one shot kit, as this is a lot less aggravation, or would the 2 pack system be stronger in re-bonding the floor layers?


26/9/2019 at 8:51pm
 Location: West country
 Outfit: Mondeo
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l did have floor delamination a few years ago. It was near the kitchen and also in the washroom, bot being areas where water can gather. The floor bounced up and down when I trod on it.

The dealer repaired it by drilling holes in the floor and injecting what presumably some kind of epoxy resin. This did make the floor feel very rigid so I would guess it restored it to its original strength.

The floor is basically plywood (or some other board) top and bottom with foam bonded between. This forms a rigid structure but the bond breaks down in time. The delam kit will replace the crumbled foam with solid epoxy so could easily be stronger than the original. It may be slightly heavier and will be less well insulated but that will make little difference.

One other reason why floors/chassis can distort is if someone has jacked it up using the corner steadies.



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27/9/2019 at 12:37pm
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Thanks Navver, I'm guessing you are right in my case regarding the delamination - the initial damage (i.e. hitting a pothole / sleeping policeman) sheared the screws holding the floor and wall around the wheel.

Over time, the bouncing action on the remaining screws became too much and they also failed. This in turn has caused the floor to delaminate due to the constant flexing of the chassis (the only solid screws were at the extreme front and rear of the van) as the middle section of floor on the n/s was taking all loading from the axle.

The caravan body appears to be very much like a cardboard box - very strong when closed up, but remove the tape securing the lid and bottom shut and it soon becomes unstable.

Further reading seems to say the chassis offers little in the way of strength vertically, as it is really only designed to withstand the "push / pull" motion when towing. From jacking the van up under the axle to resting the side wall on blocks and letting the jack down again really shows just how flexible modern chassis are (I've put axle stands under the ends of the axles just in case anyone is wondering!)

When I get a clear weekend, I'll take the lino up and start the repair process..... I'll also screw the top and bottom section of the ply floor to the end batten at intervals to add some additional strength.

At least this should improve things for a while - I don't anticipate we will have the caravan more than a couple of years as we will either trade up or give up!






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