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Wood shrinking ????

Discussion in 'Off Topic Threads' started by ntgr8, Jul 20, 2013.

  1. ntgr8

    ntgr8 Member

    Jan 29, 2010
    If I drill a 3/4" hole in in a treated 2x4 and insert a 3/4" aluminum tube will the hole get larger or smaller when the treated lumber dries? The end result is to be a deck railing. I want to be able to push the tube up about 1/2" and remove. Will the hole shrink so much that the tube won't move or will it be loose? One of the great minds out there must know for sure. I think the hole will get bigger, what do you think?
  2. thomaslea1

    thomaslea1 Member

    Feb 16, 2008
    Do a test piece and put it in the oven.
  3. FredB

    FredB Member

    Jan 29, 1998
    Soak it in Viagra.....
  4. Big Al 29

    Big Al 29 TS Member

    Jan 29, 1998
    +1 on viagra!!

    wood wont shrink
  5. trim tab

    trim tab Active Member

    Jul 23, 2007
    Las vegas
    The amount of shrinkage varies from species to species, but generally wood shrinks 8 to 10 percent tangentially, 4 to 5 percent radially, and close to zero percent lengthwise. In other words, the surface of the board where the grain intersects it perpendicularly, or close to perpendicularly, shrinks the most. This means woods of different shapes will shrink differently based on how they’re cut from the tree. Bottom line is wood does shrink when it dries.
  6. WS-1

    WS-1 Banned User Banned

    Oct 28, 2009
    A riff sawn board or a plank will shrink across its width more than a "plain sliced" board. Since newer annual rings of a tree are composed of larger, less compressed cells, the outer rings will shrink faster than the inner rings. The shrinkage will occur from the outer rings in toward the heart. It follows that annual rings close to the heart will shrink very slowly, if at all. Most Yellow Pine pressure treated 2 x 4s are cut from less valuable places within the log(i.e. either very close to the outer sappy annual rings or out of the heart which has been left over from logs turned at a plywood veneer mill)and will frequently have odd, often waney(barky)edges which clearly indicate that the piece of lumber is from new growth. It will also be very characteristically "plain sliced." Because shrinkage occurs from the outside in, a hole bored through the widest side of the 2 x 4, or the 3 1/2" sawn face will, will almost certainly not change its size in any measurable way and should not create long term problems for your project.
  7. BudsterXT

    BudsterXT Member

    Jul 17, 2010
    Only in cold water.

    Kenny U