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WBP plywood help!!

Discussion in 'Wood / Woodwork / Carpentry' started by Corrado, 12 May 2006.

  1. Corrado

    Corrado

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    WBP plywood - what is it??

    --------------------------------------------------------------------------------

    Hi

    I am having an extension built and the upstairs level is to be built from timber and the plywood cladding is meant to be WBP ply. Water and Boil Proof is what WBP stands for isn't it?

    The plywood has gone up and today it absolutely chucked it down with rain and I noticed that the plywood that they have used for the job seems to have absorbed a lot of water (dark stain patches appeared after it rained).

    I thought WBP plywood would not absorb any water, am I wrong? Is it just that the glue in the veneers is waterproof, but the veneers are not actually sealed?

    How can I tell if they have used proper WBP ply?

    Thanks!
     
  2. Scrit

    Scrit

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    Yes. The rating refers to the glue bond.

    The face veneers aren't sealed and will absorb water. Providing there isn't a soaking/drying cycle repeated over many months it won't make much difference to the plywood - the biggest problem is probably soaking then freezing which can damage plywood but is unlikely at this time of year. As for checking the grade, all construction plywood sheets (i.e. those without a fancy show veneer face) have a grading stamp somewhere on the face, normally in one corner, which identifies the mill and grade of plywood and there will be the legend "WBP" or "Exterior grade" clearly visible.

    Scrit
     
  3. Corrado

    Corrado

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    Hi Scrit, Thanks for that!

    I have been and looked at the sheets and they do not say WBP or exterior. There is a CE stamp on them, which reads something like:

    CE 1224-CPD-0099

    Sumantna Timber - I think - very blurred text...

    Do you think they have fitted standard ply? Should I be worried? This will be covered in a pebbledash render.
     
  4. Scrit

    Scrit

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    CE-marking of plywood became mandatory in April 2004 but to date all the stuff I've had from suppliers has still carried the old "WBP" marking as well and I've not taken much notice, so far........ I've just looked up the full marking and "CE 1224-CPD-0099 Sumantna Timber" breaks down to:

    CE - CE approval
    1224 - identity of notified body (?)
    CPD - European Constructions Programme Directive
    0099 - number of the product
    Sumantna Timber - manufacturers name

    after that on the same line there should be some other detail starting with the year of production (e.g. 06), etc and there may also be a standard such as "EN 636", a standard for exterior use, although it might also state "EN 13986" which indicates that the panel has been bonded with a phenolic resin, which is waterproof :confused:

    There should also be a line below that which has the product name, structural grading, etc. something like this (from a board in my workshop):

    "WISA-Spruce STRUCTURAL 2+ BS:5268-2:2002"

    That means that this board here is a spruce plyboard tested to EU standards "Structural 2+" and meeting BS:5268-2:2002 - the required standard for structural building boards used in floors, walls and roofs. It is the "Structural 2+" bit which will tell you that the boards are OK for structural use and generally implies exterior. Sorry if this is a bit arcane, but I rarely need to know that much detail about plywood - this has been an education as I have tried in vain to find a single source of information on this topic on the web :evil:

    Scrit
     
  5. Corrado

    Corrado

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    Hi

    I swear that there are no other markings on my wood... yikes - do you think that they used internal use ply!?? I am really worried now.

    If it was for internal use would it still have a number for internal use??

    Sorry to go on!
     
  6. Scrit

    Scrit

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    Sorry I didn't mean to alarm you! I wouldn't worry so much, though. The name sounds like a Malaysian or Indonesian mill in which case it is in all probablilty a hardwood with a WBP bond. The only hardwood plywood I regularly see which is not exterior grade is certain classes of Baltic birch plywood destined for the furniture trade - any they are mainly weird sizes like 5 x 5 ft. Why not ask the builder on Monday? BTW, interior grade would have different EN or BS numbers as there are standards for them, too.

    Scrit
     
  7. big-all

    big-all

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    do you know who the builders merchants or timber yard your builder uses!!!!

    phone them up and see if they sell sheets marked up as such

    another point to note if they aint full sheets you could have part of the codeing missing

    so if your sheets are only say 7ft 8" the relevent information may be lying on the floor or in the skip ;)
     
  8. Corrado

    Corrado

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    will ask them tomorrow, cheers!

    I was just paranoid as I had not seen any markings that I understood as being external (or internal).
     
  9. Corrado

    Corrado

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    EN 636", a standard for exterior use, although it might also state "EN 13986" which indicates that the panel has been bonded with a phenolic resin, which is waterproof


    Hi Scrit!! Thanks so much for the info, I went and found some blurred text, which read:

    the year - 04

    EN 636-3
    EN13986

    Thank goodness, it is the right wood! No WBP stamp, though but thanks to you I have my mind at rest :)
     
  10. billyormerod

    billyormerod

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  11. Richard C

    Richard C

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    Hi Billiyo
    Thank you for that excellent description & I don’t disagree with any of it but do you realise that this thread is over 5 years old. Corrado’s almost certainly finished his extension by now & may even have sold up & moved on.

    Welcome to the Forum but please check the “last post” date before posting yourself.
     
  12. Darwood

    Darwood

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    Yes but Corrado's not the only person who will read this.
     
  13. freddiemercurystwin

    freddiemercurystwin

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    Gah Darwood you Muppet! Stop dragging up old posts. :evil:
     
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