Class: Senior Secondary School 1 (SS1 / SSS1)
Term: 2nd Term
Week: 7
Age: 15 years
Duration: 45 minutes
Subject: Furniture Making
Curriculum Theme: Trade
Previous Lesson: Advantages And Disadvantages Of Timber Conversion.
Topic: Seasoning Of Timber
Subject Matter: Meaning of timber seasoning, Advantages of seasoning, Seasoning methods

Specific Objectives

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

Cognitive Domain:

Define timber seasoning.
State at least three advantages of seasoning timber.
List and explain three common methods of timber seasoning.

Affective Domain:

Appreciate the importance of seasoning timber for durable furniture.
Show willingness to apply proper seasoning techniques in future woodwork projects.

Psychomotor Domain:

Identify examples of air-dried and kiln-dried timber.
Sketch simple setups for air seasoning or kiln seasoning.

Discuss the benefits of using seasoned timber with peers.
Collaborate in identifying defects in unseasoned timber.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Senior Secondary Schools.
State Unified Scheme of Work for Furniture Making SS1.
Bamidele, O. (2018). Woodwork Technology for Senior Secondary Schools. Ibadan: University Press PLC.
https://www.wood-database.com/wood-articles/wood-seasoning/
https://www.britannica.com/technology/wood-drying

Instructional Materials

The teacher will teach this lesson with the aid of:

Samples of air-dried timber.
Samples of kiln-dried wood.
Charts showing different timber seasoning methods.
Pictures of seasoned and unseasoned timber.

Rationale for the Lesson

This lesson helps pupils understand how to prepare wood properly for furniture construction. Learning about timber seasoning enables pupils to produce durable and high-quality wooden products, preventing common defects caused by unseasoned wood.

Prerequisite/Previous Knowledge

Pupils should have basic knowledge of different types of timber and their uses in furniture making.

Lesson Content/Board Summary

Seasoning of Timber

Meaning of Timber Seasoning

Timber seasoning is the process of reducing the moisture content (water) in freshly cut timber to an acceptable level. This process makes the timber suitable for various uses, especially in furniture making and construction.

Advantages of Seasoning Timber

The following are the advantages of seasoning timber:

It increases the strength and durability of the timber.
It reduces the likelihood of timber shrinking, warping, splitting, or cracking after being used.
It makes the timber lighter and easier to transport and handle.
It improves the timber’s resistance to decay, insect attack, and fungal growth.
It makes the timber easier to work with, such as sawing, planing, and joining.
It allows finishes like paint, varnish, and polish to adhere better.

Methods of Timber Seasoning

The following are common methods of timber seasoning:

Air Seasoning (Natural Drying):
This method involves stacking timber in an open shed or yard, allowing natural air circulation to dry the wood. The timber is stacked with spacing between layers to ensure even drying. It is a slow and economical method.
Kiln Seasoning (Artificial Drying):
This method involves placing timber in an enclosed chamber (kiln) where temperature, humidity, and airflow are controlled. Heat is used to accelerate the drying process. Kiln seasoning is faster than air seasoning and allows for more precise control over the final moisture content.
Water Seasoning:
This method involves immersing timber in running water for a period. The water helps to wash out the sap and soluble sugars from the wood, which are food for fungi and insects. After immersion, the timber is air-dried. Variations include boiling and steaming, which also help to remove sap and reduce drying time.

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 asks them to mention different uses of timber and how they think timber is prepared before use.
Pupils’ Activity: Pupils respond by mentioning uses like making furniture, building houses, and suggest that timber might be dried.
Learning Point: Pupils connect prior knowledge to the new topic, understanding the need for timber preparation.

Step 2: Meaning of Timber Seasoning

Time: 8 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher explains the meaning of timber seasoning as the process of reducing moisture content in wood to make it stable and durable. The teacher uses samples of fresh and seasoned timber to illustrate.
Pupils’ Activity: Pupils listen attentively, observe the timber samples, and take notes on the definition.
Learning Point: Pupils understand what timber seasoning is.

Step 3: Advantages of Seasoning Timber

Time: 8 minutes
Teaching Skill: Elaboration/Listing
Teacher’s Activity: The teacher explains the various advantages of seasoning timber, such as increased strength, reduced shrinkage, better workability, and resistance to decay. The teacher writes these points on the board.
Pupils’ Activity: Pupils listen, ask questions for clarity, and copy the advantages into their notebooks.
Learning Point: Pupils understand why timber seasoning is important.

Step 4: Air Seasoning

Time: 6 minutes
Teaching Skill: Description/Illustration
Teacher’s Activity: The teacher describes the air seasoning method, explaining how timber is stacked to allow natural airflow. The teacher uses a chart or diagram to illustrate the stacking method.
Pupils’ Activity: Pupils listen, observe the chart, and ask questions about the process.
Learning Point: Pupils understand the principles and process of air seasoning.

Step 5: Kiln Seasoning

Time: 6 minutes
Teaching Skill: Description/Comparison
Teacher’s Activity: The teacher explains the kiln seasoning method, highlighting the use of controlled heat and humidity in an enclosed chamber. The teacher compares its speed and control with air seasoning.
Pupils’ Activity: Pupils listen, compare the method with air seasoning, and take notes.
Learning Point: Pupils understand the principles and process of kiln seasoning.

Step 6: Other Seasoning Methods

Time: 4 minutes
Teaching Skill: Informing
Teacher’s Activity: The teacher briefly mentions other seasoning methods like water seasoning (boiling and steaming) and explains their basic principles.
Pupils’ Activity: Pupils listen and note the existence of other methods.
Learning Point: Pupils are aware of a wider range of seasoning techniques.

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 timber seasoning.
State three advantages of seasoning timber.
List and explain two methods of timber seasoning.

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 key points of the lesson, emphasizing the importance of seasoning for durable furniture. The teacher gives pupils a take-home assignment to draw a simple diagram of an air seasoning stack.
Pupils’ Activity: Pupils listen to the summary, ask any remaining questions, and note down the assignment.
Learning Point: Reinforces the main learning points and encourages further exploration.

Lesson Keywords

Seasoning – The process of reducing the moisture content in timber.
Timber – Wood that has been prepared for use in construction or carpentry.
Moisture Content – The amount of water present in a piece of timber, usually expressed as a percentage of its dry weight.
Air Seasoning – A natural method of drying timber by stacking it in open air, allowing natural circulation to remove moisture.
Kiln Seasoning – An artificial method of drying timber in an enclosed chamber where temperature, humidity, and airflow are controlled.
Warping – Distortion in timber caused by uneven drying or internal stresses.

Differentiation

For pupils who grasp concepts quickly, the teacher can challenge them to research specific moisture content levels required for different types of furniture. For pupils needing more support, the teacher will provide simplified diagrams and allow peer-assisted learning during the explanation of seasoning methods.

Note for teachers using this lesson plan

Encourage pupils to bring small pieces of wood (freshly cut and dried) to class to observe differences. Emphasize practical applications and safety precautions when discussing timber handling. Use local examples of seasoned timber where possible.