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Thread: Warped plywood

  1. #1
    Join Date
    Jun 2013
    Location
    Jefferson Co, TX
    Posts
    1,108

    Default Warped plywood

    Any hints to how to take slight warp out of plywood?

    It is 1/2 inch exterior plywood, I set it down in yard to cut and got distracted. Came back a few hours later and now it has a slight warp. I cut it for nuc covers anyway and it will leave a gap about 3/8 inch tall in the center of the nuc. I know a cinder block will work to hold it down, but wanted to know if there was another way to make it unbowed before I paint and use them.
    Started 9/13, building slowly, now @ 10 Lang hives + 14 nucs, and treatment style not decided yet

  2. #2
    Join Date
    Mar 2015
    Location
    San Marcos, TX USA
    Posts
    167

    Default Re: Warped plywood

    Turn it over in the same spot in the grass and allow it to sit until it is straight again.
    Curtis Seebeck
    6 colonies in Central Texas

  3. #3
    Join Date
    Aug 2002
    Location
    Nehawka, Nebraska USA
    Posts
    49,240

    Default Re: Warped plywood

    Crown it. Put a board under each end and a few concrete blocks in the middle for a few days.
    Michael Bush bushfarms.com/bees.htm "Everything works if you let it." ThePracticalBeekeeper.com 40y 200h 37yTF

  4. #4
    Join Date
    Dec 2008
    Location
    Solano, California, USA
    Posts
    2,016

    Default Re: Warped plywood

    If it did it once it will do it again!

  5. #5
    Join Date
    Dec 2008
    Location
    Solano, California, USA
    Posts
    2,016

    Default Re: Warped plywood

    Next time refuse to use inexpensive plywood.

    We use only 3/4 with at least 7 plys.

    All else will twist in the rain, sun, as well as deform under the stress of the weights involved in beekeeping.

  6. #6
    Join Date
    May 2015
    Location
    Champaign, Illinois
    Posts
    376

    Default Re: Warped plywood

    Quote Originally Posted by Honey-4-All View Post
    Next time refuse to use inexpensive plywood.

    We use only 3/4 with at least 7 plys.

    All else will twist in the rain, sun, as well as deform under the stress of the weights involved in beekeeping.
    Rule #1 of carpentry is "there is no such thing as a straight board".

    Lay a piece of wood on the ground in the sun and here is what happens.
    The sunny side dries out. The cells of wood shrink on that side.
    The shady side on the ground absorbs moisture from the ground and the wood cells expand.
    This causes cupping and warpage.

    That is why I'm a freak about not laying wood directly onto the ground.
    It costs good money for that stuff.
    7-ply will not warp or cup ever?
    Wanna bet?
    Internet credibility is an oxymoron

  7. #7
    Join Date
    Aug 2011
    Location
    KC, MO, USA
    Posts
    2,049

    Default Re: Warped plywood

    Like others said flip it over for the same about of time.

    Then cut it to size, paint both sides, put it on a hive, weight it with a brick.

  8. #8
    Join Date
    Apr 2008
    Location
    west point, ms
    Posts
    425

    Default Re: Warped plywood

    If you are using it for covers go ahead and cut out and band the edges with a piece of solid wood. It will help keep it straight and help to to protect the plys. (be sure to use glue)
    Don't think you are on the right road simply because it is a well worn pathway.

  9. #9
    Join Date
    Sep 2013
    Location
    Central Alabama, Shelby County
    Posts
    126

    Default Re: Warped plywood

    Five frame nucs have been made out of the 3 ply crapwood they sell at the big boxes. The 1/2" sheets come prewarped.<GG> to help fight this i cut out the 19 by 10" nuc side and lay it down on the workbench that happens to be a piece of perfectly flat granite. Then cut a 19" by 1.75" strip of crap wood and glue it to the top 1.75" of the nuc side. Clamp and let dry. It will stay reasonably straight.

  10. #10
    Join Date
    Dec 2011
    Location
    Lottsburg, Virginia USA
    Posts
    299

    Default Re: Warped plywood

    I had problems with my nuc covers warping even if they were straight when they were made ply seems to warp anyway. that's when I read about Advantech, so I make all my nuc covers and am also making migratory covers with this stuff and it works great.
    Johno

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