Hymer B644: Rotten timer under garage floor at rear corner

Discussion in 'Hymer' started by scotjimland, May 11, 2016.

  1. scotjimland

    scotjimland Funster Life Member

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    Was alerted to this potential problem by Philip, @JeanLuc and only just got round to investigating.. Once I started poking with a screwdriver I found the problem..

    It's the rear corner under the garage floor.. which is a sandwich construction.. the timer is the frame..

    Have scrapped away most of the soft wood.. but it's still damp, it also looks like woodworm.. :eek:

    wondering what's the best way forward.. replacing the timber would be big job.. that would be the best solution.. but was thinking on cutting it back to dry timber and treating then covering over with marine ply.. basically bodge it..

    (sensible) suggestions please.. this area is about 9" x 6" IMG_0116.jpg
     
  2. Robert Clark

    Robert Clark Funster Life Member

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    Sorry you've found some damp Jim
    Could you scrape back the rotten bits then fill and smooth with an exterior grade filler?
    You could also pre treat with a good wood preservative
     
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  3. icantremember

    icantremember Funster

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    Hi Jim, I think could treat the area after geting rid of the damaged timber and damp with a wood hardener (Ronseal & Cuprinol) used to do a product ... you could then glass fibre the whole area.
     
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  4. Ivory55

    Ivory55 Funster

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    Sorry to hear you have damp. Years ago we had problems with a caravan and due to moisture the aluminium went white powder on the inside and left pin holes in it. Not know if you have aluminium panels in a hymer, if you do it might be worth looking. Hope it's not to bad of a job.
     
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  5. DBK

    DBK Funster

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    I too can recommend the hardner stuff you paint on rotten wood. It won't restore much strength but it will seal it and stop the rot. Then another bit of ply over the top perhaps?
     
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  6. hilldweller

    hilldweller Funster Life Member

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    I've done a lot of work with glass fibre over the years, it's saved my Burstner. Sort of, cut back to solid timber, dry out ( this took 2 months ) then knit it all together with glass cloth for strength and wood to add needed thickness. All this in pretty tight conditions.
     
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  7. Boringfrog

    Boringfrog Funster

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    If it's still wet you need to find where it's coming from/getting in.
     
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  8. iandsm

    iandsm Funster

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    I am sure you can repair it once back to good wood but can you eliminate the cause of it?

    Pipped at the post by the previous one which came on while I was typing. I wouldn't worry about putting ply over the area it would make a decent strong repair
     
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  9. scotjimland

    scotjimland Funster Life Member

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    I think the water ingress comes from below .. spray from the rear wheel.. there is no damp on the floor or walls inside.

    some good ideas.. thanks

    will post as the bodge progresses
     
    Last edited: May 11, 2016
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  10. Ivory55

    Ivory55 Funster

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    If it's spray from the wheels is it worth when fixed looking at spray suppression mud flaps like on trucks. I know fine mist water gets everywhere.
     
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  11. scotjimland

    scotjimland Funster Life Member

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    thanks .. never knew there was such a product.. looks like the way to go..

    http://www.screwfix.com/p/ronseal-wet-rot-wood-hardener-clear-500ml/63540
     
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  12. icantremember

    icantremember Funster

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  13. Lenny HB

    Lenny HB Funster

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    You should know better Jim Hymer & damp are two words you are not allowed to mention in the same sentence (dam done it again).:)

    Doesn't look too serious obviously not been using it enough to get woodworm! As @hilldweller says once dried out should be easy to treat with resin then build up with glass mat and resin.
     
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  14. Techno

    Techno Funster Life Member

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    I'm sure you'll do a great job of it don't we know :cool:
     
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  15. scotjimland

    scotjimland Funster Life Member

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    yes.. I thought it would have had more sarcastic comments.. but it's early days .. :LOL:
     
    Last edited: May 11, 2016
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  16. Boringfrog

    Boringfrog Funster

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    Is the floor inside bare wood or does it have some covering. Give it a good press to see if it's spongy.
     
  17. JeanLuc

    JeanLuc Funster

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    Sorry to hear you have the problem Jim. I would make a booking with Peter Hambilton. He fixed ours by cutting out and replacing the damaged section, then re-sealing it all. You would not know it has been repaired. He will do a first class job and you will have the security of knowing he is a Hymer repair expert. He has a courtesy car that you can use and it will probably be an overnight stop to ensure everything is properly dried and set before you leave. We stayed at a nearby CS the night before taking it in, and at Preston South Premier Inn for the following night which is really cheap if you book on-line well in advance. Preston has interesting history and is worth a visit in my view.
    Hymer Motorhomes and Hymer Motor Caravans from Hambilton Engineering Ltd Preston Uk - home page
     
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  18. Kim H

    Kim H Funster Life Member

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    Is this something which would be discovered during a damp check? The reason I ask is that Peter performed a damp check for us last summer and the only place that gave a reading that warranted further investigation was the T join on the roof above the drop down bed. Thankfully, it was a relatively quick fix which Peter carried out for us.
     
  19. scotjimland

    scotjimland Funster Life Member

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    the floor is a sandwich bonded construction, inside it's covered plywood.. there's no sponginess.. it's solid and sounds solid when you knock it.. having reinspected I'm fairly confident the rot is confined to that corner, it hasn't travelled up the rear or across the back.. and was probably caused by road spray

    thanks for advice @JeanLuc I'm sure Peter does a great job,.. but I'm going to repair myself..
     
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  20. JockandRita

    JockandRita Funster Life Member

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    @scotjimland. Jim, exactly what @JeanLuc posted above.

    We had a similar problem back in 2007/8, and we booked into Peter Hambilton's. According to Peter, ours was due to a Hymer design problem, and affected the S Class and E Class Hymers with the integrated rear bike racks. Peter and his team installed a couple of aluminium mods to redirect water coming off the roof, and also did a smashing repair job timber wise. Being a bit wiser and more informed now, it's a job I would be happy to tackle, but with a bit of help.

    Re your situation re splash from the rear tyres, please PM me (as I have to go out), but I'll reply in the morning.

    Cheers for now,

    Jock. :)
     
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