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Questions and Answers
What is the technical term for processed wood used as a building material?
What is the technical term for processed wood used as a building material?
Which part of the tree is the oldest and located in the very center of the wood?
Which part of the tree is the oldest and located in the very center of the wood?
What are the disadvantages of using wood as a construction material?
What are the disadvantages of using wood as a construction material?
Which type of wood comes from conifers?
Which type of wood comes from conifers?
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Which wood type is considered the most expensive?
Which wood type is considered the most expensive?
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Is bamboo classified as wood?
Is bamboo classified as wood?
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What is the unit measurement of volume of lumber?
What is the unit measurement of volume of lumber?
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Which type of plywood is commonly used for structural purposes?
Which type of plywood is commonly used for structural purposes?
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What is the most common type of plywood used for paneling and finishing?
What is the most common type of plywood used for paneling and finishing?
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Which lumber product is compressed and often used for cabinets and toilets?
Which lumber product is compressed and often used for cabinets and toilets?
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What is the formula for calculating Board Foot for Slabs?
What is the formula for calculating Board Foot for Slabs?
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What is the most common method of artificial wood seasoning?
What is the most common method of artificial wood seasoning?
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Study Notes
Wood
- Wood is a fibrous substance that composes the trunk and branches of a tree, lying between the pith and the bark.
- Xylem is the technical term for wood, while lumber refers to processed wood used as a building material.
- Timber refers to wood from trees that are yet to be processed.
Components of Wood
- Pith: the very center of the wood, the oldest part of the tree.
- Sapwood: the soft outer layer of the wood.
- Bark: the outermost layer of a tree, helping to keep out moisture.
Advantages of Wood
- Workability: wood is easy to work with.
- Non-Conductor of Heat: wood is a poor conductor of heat.
- Flexible & Durable: wood is flexible and durable.
- Lightweight: wood is a lightweight material.
Disadvantages of Wood
- Shrinkage and Swelling: wood can shrink and swell with changes in humidity.
- Fire Vulnerability: wood is vulnerable to fire.
- Moisture and Water Damage: wood can be damaged by moisture and water.
- Pest and Fungi: wood can be damaged by pests and fungi.
Types of Wood
- Hardwood: comes from deciduous trees (e.g. Narra, Yakal, and Gujo).
- Softwood: comes from conifers (e.g. Pine).
Philippine Timber
- Group 1: Ph Timber (Acacia, Agoho, Oak, Pili, and Malabayabas).
- Group 2: Ph Timber (Bakawan, Malakamias, and Malasaging).
- Group 3: Ph Timber (Yakal, a hard and golden mahogany type).
Preparation of Wood
- Cutting: the first step in preparing wood.
- Skidding: the process of moving felled trees to a landing area.
- Bucking: the process of cutting felled trees into manageable sections.
Illegal Logging
- Section 68: illegal logging is prohibited in the Philippines.
Wood Measurement
- Board Foot: a unit of measurement of volume of lumber, calculated by multiplying thickness, width, and length ( Formula: thickness x width x length / 12).
- Formula for Board Foot for Slabs: (Diameter - 4)sq x Length / 16.
Defects in Wood
- Abnormal Growth: defective wood growth.
- Deterioration: decay or rot in wood.
Wood Seasoning
- Air Seasoning: natural drying of wood.
- Forced Air Drying: artificial drying of wood using air.
- Kiln Drying: artificial drying of wood using heat.
- Radio Frequency Drying: artificial drying of wood using radio frequency energy.
Plywood
- Lightweight, made of thin veneers of wood.
- Softwood: most common type of plywood for structural use.
- Hardwood: most common type of plywood for paneling and finishing.
Grades of Plywood
- Grade A: free from defects, smooth.
- Grade B: sanded but with few defects.
- Grade C: unsanded.
- Grade D: unsanded, 1 1/2" wide.
Engineered Wood Products
- Hardboard (HDF): compressed, high-density fiberboard for cabinets and toilets.
- Particle Board (LDF): engineered wood made from chips and resin.
- MDF: medium-density fiberboard, denser than LDF, used in 4ft x 8ft sheets.
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Description
Test your knowledge on wood as a construction material with this online quiz. Learn about the different parts of a tree like xylem, sapwood, hardwood, and bark, and how they are used in the construction industry.
