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Defects in timber due to conversion?

Updated: 8/11/2023
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Wiki User

12y ago

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The main defects caused in timber are:
  • Defects due to CONVERSION
  • Defects due to FUNGI
  • Defects due to INSECTS
  • Defects due to NATURAL FORCES
  • Defects due to SEASONING
Defects due to CONVERSION :During the process of converting timber in to commercial form defects may occur:
  1. chip mark
  2. diagonal grain
  3. torn grain
  4. wane
Defects due to FUNGI:
  1. Blue strained
  2. brown rot
  3. dry rot
  4. heart rot
  5. wet rot
  6. white rot
  7. sap strained
Defects due to INSECTS :
  1. Beetles
  2. marine borers
  3. termites
Defects due to NATURAL FORCES :These are casued basically due to abnormal growth and rapture of tissues :
  1. Burls
  2. callus
  3. chemical stain
  4. coarse grain
  5. dead wood
  6. druxiness
  7. foxiness ( Having reddish brown color)
  8. knots
  9. rind galls
    • cup shakes
    • heart shakes
    • ring shakes
    • star shakes
    • radial shakes
  10. SHAKES
  11. fibers
  12. upsets
  13. water strains
  14. wind cracks
Defects due to SEASONING :
  1. bow
  2. case hardering
  3. check
  4. collapse
  5. cup
  6. honey combining
  7. radial shakes
  8. split
  9. twist
  10. warp
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8y ago
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9y ago

Timber defects are imperfections that occur naturally or commercially. Some of the most common are knots, compression creases, pitch pockets, and waney edges.

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12y ago

slope of grain. bow. spring. twist. cup

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The main defects caused in timber are:Defects due to CONVERSIONDefects due to FUNGIDefects due to INSECTSDefects due to NATURAL FORCESDefects due to SEASONINGDefects due to CONVERSION :During the process of converting timber in to commercial form defects may occur: chip markdiagonal graintorn grainwaneDefects due to FUNGI:Blue strainedbrown rotdry rotheart rotwet rotwhite rotsap strainedDefects due to INSECTS :Beetlesmarine borerstermitesDefects due to NATURAL FORCES :These are casued basically due to abnormal growth and rapture of tissues : Burlscalluschemical staincoarse graindead wooddruxinessfoxiness ( Having reddish brown color)knotsrind galls cup shakesheart shakesring shakesstar shakesradial shakesSHAKESfibersupsetswater strainswind cracksDefects due to SEASONING :bowcase harderingcheckcollapsecuphoney combiningradial shakessplittwistwarp


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There are many issues that can effect the quality of wood & timber. Defects usually mean that a quality piece of timber can be sold at a discounted price.


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What are the man made defects in timber?

The only man-made defects in timber are what wasn't cut properly or a particular board that was warped wasn't caught out of thousands of other boards that are cut, sorted and stacked in the sawmill.