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  1. #1
    Join Date
    Mar 2018
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    Albany
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    40
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    9

    Default 9mm v 12mm plywood

    I know its been flogged to death but just after opinions on the best thickness for lining.

    Im not worried about hanging strength, my studs are at 390 centres so anything heavy will be fixed to them.

    Im more after i put on the difference in look. I have some 9mm already and it is very wavy looking over the length of the sheet. 12mm seems alot more rigid overall.

    So would the 12mm look better overall and have neater edges than 9mm?

    Has anyone used 9mm and then down the track wish they had of used something thicker?

    Thanks for your time
    Adam

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  3. #2
    Join Date
    Jan 2005
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    Campbelltown NSW
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    77
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    Default

    I used 9mm CD grade to line mine about 4 years ago. No regrets, it’s been very stable. Anything heavy I use the studs. I painted mine a light grey, about the colour of the electrical conduit attached to the walls.

  4. #3
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    Mar 2018
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    Albany
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    Default

    Thanks for that apple8. Im thinking of daving some $$ and weight by going 9mm

  5. #4
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    Jan 2005
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    Campbelltown NSW
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    Default

    Yes, weight was one of my drivers for choosing 9mm, the other was I was lining over 40+ year old hardwood that had developed a few warps and twists over the years and the 9mm was flexible enough fit up the studs with minimal usage of shims. I fixed it to the hardwood studs with 40mm brads and a nail gun after using earth wool insulation between the ply and the fibro cladding. There are some detail in the thread that might help if yours is a similar construction. Shed Upgrade and Lining

  6. #5
    Join Date
    Oct 2007
    Location
    Alexandra Vic
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    69
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    2,810

    Default

    How flat ply will be is a function of how it is installed and how well you can manage moisture levels on the faces. My father sheeted out a large sunroom (22' x 15') with 1/4" inch ply over hardwood studs 50 odd years ago and sold the place 30 years ago to retire to QLD. Sunroom ply was flat and dry when installed and stayed flat until he sold it. They visited the house 15 years later and the roof has started to leak in spots due to poor maintenance, back of the ply had gotten damp and the ply had warped, plus a lot custom veneer work in the master bedroom was damaged due to moisture ingress.

    My concern about thinish ply in a shed would be about just how weathertight the shed was to start with. For the typical metal clad shed found these days, I suspect that there are enough gaps between floor and wall cladding, wall cladding and roofing, and around doors and windows for there to always be some moisture around inside the cladding and roofing if you have variable weather. Once you sheet out the inside, this tends to be trapped around the framing and will penetrate the back side of the plywood, creating expansion and warping. Thicker ply has more strength to resist the warping, but the root cause of the problem remains.
    I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.

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