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SESK: Stuff Everyone Should Know · sesk.info/wood-starved-joint

What happens when you clamp a glue joint with far too much pressure?

The glue squeezes out, leaving a starved joint.

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  1. The glue cures faster and stronger
  2. Too much glue squeezes out and leaves a weak, starved joint ✔
  3. The joint becomes elastic and flexible

Why: Clamps close the joint and press the glue into a thin film, but too much pressure drives it out or deep into the wood. Not enough glue is left in the glue line, so the bond is weaker.

Huh, didn't know that: Over-penetration is common in low-density woods and excess squeeze-out is common in high-density woods.

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Why was the tree stumped? It couldn't get to the root of the problem.
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References

Answer: Too much glue squeezes out and leaves a weak, starved joint. Clamps close the joint and press the glue into a thin film, but too much pressure drives it out or deep into the wood. Not enough glue is left in the glue line, so the bond is weaker.

  1. Wood Handbook: Wood as an Engineering Material, FPL-GTR-282 (USDA Forest Products Laboratory, 2021) research.fs.usda.gov/treesearch/62200
    result in a starved joint and produce inferior bond strength
    Checked 2026-10-10.

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