WOOD DEFECTS : LSUS
Basic Technology JSS3 First Term
WEEK – THREE
By the end of the lesson, the students should be able to learn:
- Wood defects
- Manufactured boards
A defect in timber is any feature in timber that reduces the quality and market value of timber. Defects in timber can be grouped into two types
1. The natural defects: these are the defects that occur during the growth of the tree. Examples include knots, shakes, upset grains and cross grains.
- KNOT: These occur at the point where branches grow from the trunkof trees. When the knot rot away and fall out of position it leaves what is known as knot-hole
- SHAKES: These.... View More
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