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Questions and Answers
What is the primary function of the bark in a tree?
What type of trees are generally used for roof timbers and other structural applications where appearance is not a concern?
Which part of the tree becomes heartwood as it matures?
Why is it important to use wood from replanted forests in the construction industry?
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What is the primary difference between sapwood and heartwood?
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What does the term 'Softwood' refer to in the context of timber?
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Study Notes
Timber in Construction
- Timber includes both sapwood and heartwood, both of which possess similar strength but differ in durability.
- Heartwood is more durable, making it preferable for long-lasting applications.
- Sustainable forestry practices require that timber comes from replanted forests after harvesting.
Sapwood
- Sapwood is the outer, active layer of a tree that transports sap from roots to leaves.
- Over time, sapwood matures into heartwood as the tree ages.
Heartwood
- Heartwood, the non-active core of the tree, is usually darker and provides structural support.
- It is recognized for its enhanced durability, making it ideal for timber conversion.
Bark
- Bark serves several critical functions:
- Acts as a moisture barrier
- Provides thermal insulation
- Protects the tree from extreme temperatures and biological attacks.
Softwoods and Hardwoods
- Classification of wood as softwood or hardwood is based on botanical origins rather than density or hardness.
- Softwoods are derived from cone-bearing trees, typically evergreen with needle-like leaves.
- They grow faster than hardwoods and are commonly used for structural applications such as roofing, partition walls, and decking where visual aesthetics are less significant.
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Description
This quiz covers the properties and uses of timber in building construction, including the differences between sapwood and heartwood, and sustainable forestry practices.
