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Help - advice on Mold on Plywood

Discussion in 'Wood / Woodwork / Carpentry' started by MeoMeo, 3 Jul 2019.

  1. MeoMeo

    MeoMeo

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  3. JohnD

    JohnD

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    if it has been wet through the winter, there is a considerable chance of delamination. Even nominally WBP grade will do this in a week or two. post some pics, especially of the edges.
     
  4. MeoMeo

    MeoMeo

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  5. MeoMeo

    MeoMeo

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    @JohnD Noticed this evening the top layer of a few boards are 'flaking off'. I'm fearing this delamination you mentioned has happened :(:(:cry:
     
  6. Gerrydelasel

    Gerrydelasel

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    Plywood cannot be left outdoors in the UK Climate. I'm amazed that people think it can. Just look around you at anything made from plywood; billboards, hoarding, blocked-up windows... if it's been there for more than a few weeks you'll see it's always rotting and delaminating. Use plywood for temporary outdoor structures only.
     
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  8. cwhaley

    cwhaley

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    That's not true. I was given a large shed for free but it needed a new roof. I laid 3 x 18mm plywood sheets on the roof and covered with thick roofing felt. That was nearly 3 years ago and the ply is bone dry and solid. My dad also used the same spec ply on a roof for a gazebo and that was nearly 10 years ago and still absolutely fine.

    As long as it's protected from the rain it'll be fine.
     
  9. Gerrydelasel

    Gerrydelasel

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    That was exactly my point. If it's protected from rain on one side and sitting above dry air on the other, then it's not outdoors, it's part of an indoor structure.
     
  10. cwhaley

    cwhaley

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    No worries. I was just clearing up the fact that ply can be used indoors and outdoors if protected. Your comment reads as if you're telling people not to use it other than for temporary use. The underside of the roof overhang on my shed is exposed 24/7 but the roofing felt above it keeps rain off the top -- it is outside but protected.
     
  11. opps

    opps

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    My "temporary" backgate is now 18 years old. It is a sheet of 18mm WBP plywood. It did get a coat of waterbased fence paint (one side only) but, well that was 18 years ago.

    TBH I only expected it to last a couple of years but there is no delamination, so I have no plans to replace it.

    Given that the wind tends to come in from the west, it is slightly protected by the garage that it butts up to but under normal circumstances (ie) rain that isn't driven by the wind, the gate gets wet.
     
    Last edited: 22 Jul 2019
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