plywood verus hardboard

Discussion in 'Motorhome Chat' started by lee52, Mar 18, 2014.

  1. lee52

    lee52

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    just a quickie
    just wondering why 3mm plywood is used for ceiling and wall panels apposed to 3mm hardboard
     
  2. Minxy Girl

    Minxy Girl Funster Life Member

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    Probably because plywood is stronger than hardboard! :Smile:
     
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  3. jhorsf

    jhorsf Read Only Funster

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    I would imagine hardboard would sag between fixings

    No doubt Terry will be along in a minute with a pro's answer

    but do not be surprised if he says "cause hardboard is sh1te"
     
    Last edited: Mar 18, 2014
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  4. TheDentons

    TheDentons Funster

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    Plywood is more stable less prone to sag due to opposing grain in the board
     
  5. lee52

    lee52

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    am using ply anyways was just wondering thats all. Didnt think about the sagging knew it wasnt as strong screwing things to it etc...
     
  6. mitzimad

    mitzimad Funster

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    ply is stronger more resistant to damp and curves better than hardboard
     
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  7. mikebeaches

    mikebeaches Funster

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    Exactly so. :thumb:

    Mike
     
  8. TheBig1

    TheBig1 Funster Life Member

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    hardboard is made from wood pulp so no grain and takes up moisture and swells. plywood is thin opposing layers of wood with a natural grain bonded usually with water resistant glue.
    ply has a greater structural strength too
     
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  9. camocam1

    camocam1 Read Only Funster

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    Manufacturers may also use flexi ply on curved areas such us the Luton roof
     
  10. Scattycat

    Scattycat Funster

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    'Cause hardboard 'grows'and ply is more stable.
     
  11. treetops1

    treetops1 Funster

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    Most caravan manufacturers used to soak all hardboard so when fitting would dry flat and tight .Not sure they still do but it certainly worked.
     
  12. jhorsf

    jhorsf Read Only Funster

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    Swift still do :Rofl1:
     
  13. Terry

    Terry Funster

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    Well here I am:BigGrin: hardbord will bow between fixings :BigGrin: and like John said it's sh-t needs finishing and although very strong under compression not much else going for it :Smile:
    if you can wait a few days until I get my van and I will post tips and what to do with the roof to stop any bellying.When I eventually get it I will only be a day ripping out what the nutter did and will have the insulation along with the new inner roof in along with pics -- lots of pics:thumb:
    terry
     
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  14. DeuceBG

    DeuceBG Funster

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    I didn't know you could even buy Hardboard now.
    What's it used for these days?
    As a kid I remember my old man (an incorrigible DIY'er) dry-lining room after room with it in our old house and even building cupboards out of it.
    I'm not sure Plywood even existed back in the early 1970's.
     
  15. Terry

    Terry Funster

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    That's because it was cheap :BigGrin: If your old man made cupboards from it I bet he made a traditional frame(2 x 1 etc)and covered it with HB --ply has been around for about 100 yrs :Wink:--I think MDF has taken over from HB -that too is heavy but if kept dry it does not warp,shrink or move :Smile:Weight alone will keep it out of a M/H
    TERRY
     
  16. scotjimland

    scotjimland Funster Life Member

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    indeed.. just had to look that up...

    In 1797 the Englishman Sir Samuel Bentham applied for patents covering several machines to produce veneers. In his patent applications, he described the concept of laminating several layers of veneer with glue to form a thicker piece – the first description of what we now call plywood.


    an interesting history of plywood.. .. http://en.wikipedia.org/wiki/Plywood

    I have a Singer Sewing Machine Cabinet, partly made from plywood , dates from 1917..


    More Photos herehttp://scotjimland.blogspot.co.uk/2012/06/singer-drawing-room-cabinet-no-21-with.html
    [​IMG]
     
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  17. JeanLuc

    JeanLuc Funster

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    That is a beautiful Singer example SJ and a wonderful restoration job (I assume you had to restore the cabinet). We inherited a somewhat more utilitarian, and probably younger, version from my aunt; the base is a simple open format with drawers at the top. It is now with our daughter but I have to admit that the veneers have lifted in some places (corners) and it looks a bit the worse for wear. She likes it though and uses it as a general stand (until recently for an aquarium).
    We still have the machine in the loft.
     
  18. Terry

    Terry Funster

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    Jim will take it off your hands releasing room in the loft for more junk :BigGrin:
    PS I have not yet started to throw non throw away crap in my loft still got a little room left on and around my pool table :BigGrin:
    terry
     
  19. scotjimland

    scotjimland Funster Life Member

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    Hi ... thanks, tis indeed lovely example..
    wish I could claim that it was all my work.. but no restoration.. just a good clean and polish .
    I stripped the machine head and cleaned and oiled.. and as they say.. she runs like a sewing machine..

    if you look at the blog you will see a few more of my collection.. It started out when I bought an old Singer to do some work for the RV.. I fell in love with them.. I also have fond memories of my grandmother sewing on her treadle.. she was a tayloress, as were several other aunts and family members..

    here it is sewing..

    [ame="https://www.youtube.com/watch?v=9WZwsRsxiPc"]https://www.youtube.com/watch?v=9WZwsRsxiPc[/ame]

    and some more..

    [ame="https://www.youtube.com/watch?v=-pNbwaiXVTE"]https://www.youtube.com/watch?v=-pNbwaiXVTE[/ame]
     
    Last edited: Mar 19, 2014
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  20. Larrynwin

    Larrynwin Funster

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    Plywood stays flat as a result of its cross laminated structure and is lighter than hardboard which as already stated can sag between fixings.
    In a potentially damp application use WBP plywood not MR .
     
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