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Questions and Answers
What is the primary function of the bark in a tree?
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?
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?
Which part of the tree becomes heartwood as it matures?
Why is it important to use wood from replanted forests in the construction industry?
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?
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?
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.
