Plywood Shrinkage
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    Plywood Shrinkage

    Has anyone ever seen plywood shrink this much?
    The plywood 7/8" thick & is the sub floor in a house that was converted from a garage. There are some sheets where the plywood has split in the middle of the sheets The conversion was done in 1992.
    I have been in construction for over 40 years & I have never seen anything like this before.
    Attached Thumbnails Attached Thumbnails IMG_20170406_084449802.jpg   IMG_20170406_102721069.jpg   IMG_20170406_084527514.jpg  
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    Huh. That's extremely unusual. I've never seen it shrink that much either.
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    Keeper of the GTT Cookies dieselshadow's Avatar
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    Wow. Must've been really high moisture content when it was installed.
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    Quote Originally Posted by dieselshadow View Post
    Wow. Must've been really high moisture content when it was installed.
    My first thought was saturation, but how would it swell that much with respect to the cross grained layers?


    Strange situation for sure! Interesting how it's held at width with the nails.
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    Very unusual guessing same as others of moisture. My first look at the picture with tape showing size of gap ,,looks to me IMO that someone had taken a circular saw and opened a gap to maybe let water run off the subfloor during building ..
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    Quote Originally Posted by etcallhome View Post
    Very unusual guessing same as others of moisture. My first look at the picture with tape showing size of gap ,,looks to me IMO that someone had taken a circular saw and opened a gap to maybe let water run off the subfloor during building ..
    The floor has always had a roof over it. There has never been standing water in the building. This building is next door to me. I saw the construction progress when the work was done. The joints were tight when the floor was put down & has been covered with the original carpet since 1992. As Jason said, the moisture content of the plywood must have been very high when it was put down.
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    Quote Originally Posted by ChrisR View Post
    The floor has always had a roof over it. There has never been standing water in the building. This building is next door to me. I saw the construction progress when the work was done. The joints were tight when the floor was put down & has been covered with the original carpet since 1992. As Jason said, the moisture content of the plywood must have been very high when it was put down.
    Ok if no water was on floor doing construction , plywood must have had a lot of moisture.. Sure don't see that normally with plywood.
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    Was it treated plywood or standard. The only reason I ask was because it was supposed to be a garage floor. When they pressure treat they force the moisture of the preservative back in, essentially in an autoclave.

    Pressure treated plywood does shrink allot.
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    Quote Originally Posted by MeagerHair View Post
    Was it treated plywood or standard. The only reason I ask was because it was supposed to be a garage floor. When they pressure treat they force the moisture of the preservative back in, essentially in an autoclave.

    Pressure treated plywood does shrink allot.
    It was not pressure treated plywood. It looks like poplar. It may be imported plywood. The original concrete garage floor is 40" below the plywood. The plywood is attached to 2 x 10 floor joists.
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    That is a new one on me, I was thinking the same thing meager was about it being treated.
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