Class: Senior Secondary School 1 (SS1, SS 1, SSS1, SSS 1)
Term: 2nd Term
Week: 4
Age: 15 years
Duration: 45 minutes
Subject: Wood Work
Curriculum Theme: Vocational Studies
Previous Lesson: Characteristics of Timber Preservatives and Application Methods.
Topic: TIMBER PRODUCTS AND MANUFACTURED BOARDS
Subject Matter: timber products, veneers, manufactured boards, types of man made boards

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define timber products and veneers.
Explain what manufactured boards are.
List and describe at least four types of manufactured boards.

Affective Domain:

Appreciate the advantages of using manufactured boards over solid timber.
Value the different aesthetic qualities that veneers offer.

Psychomotor Domain:

Identify different types of manufactured boards and veneers when presented with samples or charts.
Sketch simple cross-sections of common manufactured boards.

Discuss the practical applications of timber products and manufactured boards in everyday life and construction.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Wood Work (Senior Secondary).
State Unified Scheme of Work for Senior Secondary Wood Work.
Woodwork for Senior Secondary Schools by A.O. Okoro.
Real veneers, charts showing different manufactured boards.

Instructional Materials

The teacher will teach this lesson with the aid of:

Real veneers.
Charts showing different types of manufactured boards.
Samples of manufactured boards (e.g., plywood, MDF, chipboard, hardboard, blockboard).
Whiteboard and markers.

Rationale for the Lesson

This lesson helps pupils understand various processed timber products and manufactured boards used in carpentry and construction. Knowing these materials enables them to select appropriate materials for different woodworking projects and appreciate their advantages over solid timber.

Prerequisite/Previous Knowledge

Pupils should have basic knowledge of timber and its properties from previous lessons.

Lesson Content/Board Summary

TIMBER PRODUCTS AND MANUFACTURED BOARDS

Timber Products

Timber products are materials derived from wood, often processed for specific uses beyond raw lumber. These include veneers and manufactured boards.

Veneers

Veneers are very thin slices of wood, typically thinner than 3mm, obtained from logs. They are often glued onto less expensive base materials (like manufactured boards) to give the appearance of solid wood or to create decorative patterns.

The following are common types of veneers:

Rotary-cut veneer: Produced by rotating a log against a long blade, yielding a continuous sheet.
Sliced veneer: Produced by slicing a log or flitch (half log) with a knife, yielding individual sheets.

Manufactured Boards (Man-Made Boards)

Manufactured boards are composite wood panels made by bonding wood particles, fibres, or thin sheets together with adhesives, heat, and pressure. They are engineered to have consistent properties and overcome some limitations of solid timber.

The following are advantages of manufactured boards:

They offer dimensional stability (less warping or shrinking).
They are available in large, consistent sheets.
They are often more cost-effective than solid timber.
They utilize wood waste, making them environmentally efficient.

Types of Manufactured Boards

Plywood

Plywood is made by gluing together thin layers (plies) of wood veneer with the grain of adjacent layers at right angles to each other. This cross-graining technique improves strength and stability, making it resistant to splitting and warping.

Common uses include: furniture, doors, wall panels, subflooring, boat building.

Blockboard

Blockboard consists of a core made of strips of solid wood (blocks) glued together, sandwiched between outer veneers on both sides. The core blocks are typically narrow and glued edge-to-edge.

Common uses include: tabletops, shelves, doors, partitions, furniture panels requiring strength and stability.

Chipboard (Particleboard)

Chipboard is made from wood chips, sawmill shavings, or sawdust, mixed with a synthetic resin adhesive and pressed under heat to form rigid panels. It is generally less dense and less strong than plywood or MDF.

Common uses include: inexpensive furniture, kitchen cabinets (often laminated or veneered), floor underlayment, packaging.

Medium Density Fibreboard (MDF)

MDF is an engineered wood product made by breaking down hardwood and softwood residuals into wood fibres, combining them with wax and a resin binder, and forming panels by applying high temperature and pressure. It has a smooth surface and uniform density.

Common uses include: furniture, cabinets, speaker boxes, decorative mouldings, shop fittings.

Hardboard

Hardboard (also known as high-density fibreboard, HDF) is made from wood fibres extracted from chips and pulped wood waste. It is formed into sheets using a wet process and then pressed under high temperature and pressure, resulting in a dense, smooth panel, often with one smooth and one textured side.

Common uses include: drawer bottoms, cabinet backs, door skins, temporary coverings, pegboards.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and reviews the previous lesson on types of timber. The teacher then displays samples of veneers and different manufactured boards (e.g., plywood, MDF) and asks pupils to identify them or state their uses.
Pupils’ Activity: Pupils respond to questions and observe the displayed materials.
Learning Point: Pupils recall previous knowledge and are introduced to the topic of new timber products.

Step 2: Presentation of Timber Products and Veneers

Time: 10 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher defines timber products and explains what veneers are, demonstrating with actual veneer samples. The teacher discusses how veneers are produced (rotary-cut, sliced) and their common applications.
Pupils’ Activity: Pupils listen attentively, observe the veneer samples, ask questions for clarification, and take notes.
Learning Point: Pupils understand the definition and types of timber products, specifically veneers.

Step 3: Introduction to Manufactured Boards

Time: 5 minutes
Teaching Skill: Explanation/Discussion
Teacher’s Activity: The teacher introduces manufactured boards as composite wood panels, explaining how they are made and their general advantages over solid timber (e.g., stability, size, cost-effectiveness).
Pupils’ Activity: Pupils listen, participate in a brief discussion on the advantages, and note down key points.
Learning Point: Pupils grasp the concept of manufactured boards and their benefits.

Step 4: Presentation of Plywood and Blockboard

Time: 8 minutes
Teaching Skill: Explanation/Illustration
Teacher’s Activity: The teacher explains Plywood and Blockboard in detail, describing their composition and showing samples or detailed charts. The teacher highlights their distinct features and common uses.
Pupils’ Activity: Pupils observe the samples/charts, identify the differences, and record information in their notebooks.
Learning Point: Pupils understand the composition and uses of Plywood and Blockboard.

Step 5: Presentation of Chipboard and Medium Density Fibreboard (MDF)

Time: 7 minutes
Teaching Skill: Explanation/Comparison
Teacher’s Activity: The teacher explains Chipboard and MDF, showing samples and discussing their manufacturing process, characteristics, and typical applications. The teacher may compare their properties with Plywood.
Pupils’ Activity: Pupils observe, listen, and identify the characteristics that differentiate Chipboard and MDF from other boards.
Learning Point: Pupils learn about Chipboard and MDF, understanding their properties and uses.

Step 6: Presentation of Hardboard

Time: 5 minutes
Teaching Skill: Elucidation
Teacher’s Activity: The teacher describes Hardboard, explaining its production process, unique features (e.g., one smooth side, one textured side), and common uses. The teacher displays a sample of hardboard.
Pupils’ Activity: Pupils listen, observe the sample, and ask questions about its applications.
Learning Point: Pupils gain knowledge about Hardboard and its specific uses.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define veneers and mention two ways they are produced.
What are manufactured boards?
State three advantages of using manufactured boards over solid timber.
List and briefly describe any two types of manufactured boards.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 3 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the lesson by reiterating the main points about timber products, veneers, and the various types of manufactured boards and their uses. The teacher assigns homework: “Draw and label simple cross-sections of plywood and blockboard.”
Pupils’ Activity: Pupils listen to the summary and copy the homework.
Learning Point: Pupils consolidate their learning and prepare for further practice.

Lesson Keywords

Timber products – Materials derived from wood, often processed for specific uses.
Veneers – Thin slices of wood glued onto base materials for aesthetics or stability.
Manufactured boards – Composite wood panels made by bonding wood particles, fibres, or sheets.
Plywood – Board made of cross-grained wood veneers glued together.
Blockboard – Board with a core of solid wood strips sandwiched between veneers.
Chipboard – Board made from wood chips and resin pressed together.
MDF (Medium Density Fibreboard) – Board made from wood fibres, wax, and resin pressed under heat.
Hardboard – Dense board made from compressed wood fibres, often with one smooth side.

Differentiation

The teacher will provide additional visual aids and simplified explanations for pupils who are struggling, while encouraging more advanced pupils to research specific applications or environmental impacts of different boards.

Note for teachers using this lesson plan

Teachers should ensure they have adequate samples of each board type for pupils to handle and examine. Emphasize safety precautions when handling woodworking materials in practical sessions.