What are the main types of wood, and how do their properties decide what they are used for?
Identify the main types of wood (hardwoods, softwoods and manufactured boards) and describe their properties and uses
A clear answer to the N(A)-Level D&T outcome on wood. The difference between hardwoods, softwoods and manufactured boards, their key properties such as strength and grain, and how properties decide their uses.
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What this dot point is asking
SEAB wants you to know the main types of wood, which are hardwoods, softwoods and manufactured boards, and to describe their properties and typical uses. The big idea is that a material's properties decide its uses: you pick a wood because its strength, weight, appearance or cost suit the job.
The answer
The three families of wood
- Hardwoods come from broad-leaved (deciduous) trees that grow slowly, such as oak, beech and mahogany. Slow growth makes them generally denser, harder and more durable, but more expensive. Used for quality furniture and items that must last.
- Softwoods come from coniferous (cone-bearing) trees that grow faster, such as pine and cedar. They are generally lighter, cheaper and easier to work, but less hard. Used for construction, cheaper furniture and shelving.
- Manufactured boards are made by gluing wood fibres, particles or thin layers into large flat sheets, such as plywood, MDF and chipboard. They come in big, even panels with no knots or strong grain direction.
The terms hard and soft describe the tree type, not always the actual hardness; balsa is a hardwood but is very soft.
Properties of wood
Useful properties to know:
- Strength. How much load it carries without breaking.
- Hardness. How well it resists scratches and dents.
- Grain. The pattern of fibres; solid wood is stronger along the grain and can split across it.
- Durability. How well it resists rot and wear.
- Appearance. Natural colour and pattern, valued in furniture.
- Workability. How easily it cuts, shapes and joins.
Manufactured boards in detail
Manufactured boards solve problems of solid wood. Plywood is layers glued with grains crossed, making it strong in all directions and resistant to splitting. MDF is fine fibres pressed into a smooth, even board that paints well and has no grain direction, ideal for flat panels. Chipboard is cheap particles bonded together, often used with a surface covering. They come in large flat sheets, stay flat, and avoid knots.
Matching property to use
The link runs both ways: oak's hardness and good looks suit a dining table; pine's low cost and easy working suit a shelf; MDF's flat, smooth, cheap sheets suit a painted cabinet door. Always justify a wood choice by the property the job needs.
Examples in context
Example 1. An outdoor bench. Durability against rain matters, so a naturally durable hardwood or a treated softwood is chosen over MDF, which would swell when wet. The property of weather resistance drives the choice.
Example 2. A painted bookshelf. The shelves must be flat, smooth and cheap, and will be painted, so MDF is ideal: it has no grain to show through paint and comes in large even sheets, unlike pricier solid wood.
Try this
Q1. State whether each is a hardwood, softwood or manufactured board: oak, pine, plywood. [3 marks]
- Cue. Oak is a hardwood, pine is a softwood, plywood is a manufactured board.
Q2. Give one reason MDF is good for a large painted panel. [1 mark]
- Cue. It is flat, smooth and has no grain direction, so it paints evenly and comes in large even sheets.
Q3. Explain why grain direction matters when using solid wood. [3 marks]
- Cue. Solid wood is stronger along the grain and can split across it, so loads and joints must be arranged to work with the grain, not against it.
Exam-style practice questions
Practice questions written in the style of SEAB exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Original6 marksExplain the difference between a hardwood, a softwood and a manufactured board. Give one example and one typical use for each.Show worked answer →
Hardwood comes from broad-leaved trees that grow slowly, so it is usually denser and harder. Example: oak, used for quality furniture.
Softwood comes from coniferous trees that grow faster, so it is generally lighter and cheaper. Example: pine, used for cheaper furniture and construction.
A manufactured board is wood made into sheets from fibres, particles or thin layers glued together. Example: plywood (or MDF), used for shelving and flat panels.
What markers reward: hardwood from broad-leaved trees (denser, harder), softwood from coniferous trees (lighter, faster growing), and manufactured board as a made sheet material, each with a correct example and a sensible use.
Original4 marksA designer needs a large, flat, smooth panel for the door of a cabinet and wants to keep the cost low. Explain why a manufactured board such as MDF may be a better choice than solid hardwood.Show worked answer →
MDF comes in large flat sheets with a smooth, even surface, so it is ideal for a flat panel and takes paint well. It is cheaper than solid hardwood and does not have knots or a strong grain direction, so it stays flat and is easy to cut to size. Solid hardwood is more expensive, can warp, and is harder to get as one wide flat piece.
What markers reward: the points that MDF is flat, smooth, cheaper and stable with no grain direction, matched to the need for a large flat low-cost panel, with a contrast to hardwood's cost or warping.
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