Class: Senior Secondary School 1 (SS1, SS 1, SSS1, SSS 1)
Term: 3rd Term
Week: 1
Age: 15 years
Duration: 45 minutes
Subject: Building Construction
Curriculum Theme: Building Construction
Previous Lesson: .
Topic: Ground Floor: Functions and Types of Floors
Subject Matter: functions of ground floor, types of ground floor solid and suspended, basic components of a solid floor, simple section sketches, site observation of floors

Specific Objectives

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

Cognitive Domain:

Explain the functional requirements of ground floors.
State the two main types of ground floors.
List the basic components of a solid ground floor.

Affective Domain:

Appreciate the importance of different ground floor types in building construction.
Show interest in observing ground floor construction on a building site.

Psychomotor Domain:

Sketch a simple section of a solid ground floor.
Identify different floor components during a site observation (if applicable).

Participate actively in class discussions about ground floors.
Collaborate with peers during a simulated or actual site observation activity.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Basic Technology (Senior Secondary Education)
State Unified Scheme of Work for Building Construction SSS 1
Building Construction for Senior Secondary Schools by Olusola Adekunle
Relevant charts and diagrams showing floor sections.

Instructional Materials

The teacher will teach this lesson with the aid of:

Chalkboard/Whiteboard and markers/chalk
Charts illustrating sections of solid and suspended ground floors
Spirit level, trowel, head pan, lines, straight edge, wooden float, cement, sand, gravels (for demonstration or visual aid)
Pictures or video clips of building construction sites showing ground floor work.

Rationale for the Lesson

This lesson helps pupils understand how the base of a building is constructed, which is important for the stability and comfort of a structure. Knowing about different floor types and their components enables pupils to appreciate how buildings are made safe and durable for daily use.

Prerequisite/Previous Knowledge

Pupils should have basic knowledge of building materials such as cement, sand, gravel, and some general understanding of basic building components.

Lesson Content/Board Summary

Ground Floor: Functions and Types of Floors

Functions of Ground Floors

The ground floor is a fundamental part of any building. Its main functions include:

To provide a firm and level surface for occupants and furniture.
To support the loads from occupants, furniture, and partitions.
To prevent the passage of dampness from the ground into the building.
To provide thermal insulation, keeping the building warm or cool.
To provide sound insulation, reducing noise transmission.
To resist insect and rodent infestations.
To provide fire resistance.

Types of Ground Floors

Ground floors are broadly classified into two main types:

Solid Ground Floors
Suspended Ground Floors

Solid Ground Floor

A solid ground floor is one that rests directly on the prepared ground beneath it. It is commonly used where the ground is stable and not susceptible to significant movement.

The following are the basic components of a typical solid ground floor (from bottom to top):

Hardcore: A layer of broken bricks, stones, or concrete rubble laid directly on the earth to provide a firm, level base and prevent rising damp.
Blinding: A thin layer of sand or fine aggregate spread over the hardcore to fill voids and create a smooth surface for the damp-proof membrane.
Damp-Proof Membrane (DPM): A continuous layer of impervious material (e.g., thick polythene sheet or asphalt) laid over the blinding to prevent moisture from rising from the ground into the floor structure.
Concrete Slab: A layer of concrete (usually reinforced) laid over the DPM, forming the main structural element of the floor.
Screed: A thin layer of cement and sand mortar laid on top of the concrete slab to provide a smooth and level surface for the final floor finish.
Floor Finish: The topmost layer, such as tiles, carpet, timber, or terrazzo, chosen for aesthetic appeal, durability, and function.

Suspended Ground Floor

A suspended ground floor is a floor that is raised above the ground level, creating a void or air space beneath it. This type of floor is often used on sloping sites, in areas prone to dampness, or where services need to run beneath the floor.

Suspended floors typically consist of timber joists or concrete beams and slabs supported by dwarf walls or piers, with a sub-floor ventilation system to prevent dampness and rot.

Simple Section Sketch of a Solid Ground Floor

A simple section sketch of a solid ground floor visually represents the arrangement of its components from the ground level upwards, showing the hardcore, blinding, DPM, concrete slab, screed, and floor finish.

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 identify different parts of the classroom building, specifically pointing to the floor. The teacher then asks what they think makes the floor strong and stable.
Pupils’ Activity: Pupils respond by identifying the floor and offering initial thoughts on its strength and stability.
Learning Point: Pupils are introduced to the concept of the ground floor and its importance.

Step 2: Functions of Ground Floors

Time: 10 minutes
Teaching Skill: Explanation/Discussion
Teacher’s Activity: The teacher explains the various functional requirements of a ground floor, such as providing a level surface, supporting loads, preventing dampness, and providing insulation. The teacher writes these functions on the board.
Pupils’ Activity: Pupils listen attentively, ask questions for clarity, and copy the functions into their notes.
Learning Point: Pupils learn and understand the essential roles of a ground floor in a building.

Step 3: Types of Ground Floors

Time: 10 minutes
Teaching Skill: Classification/Explanation
Teacher’s Activity: The teacher introduces the two main types of ground floors: solid ground floors and suspended ground floors. The teacher briefly describes each type, explaining where each might be used. Visual aids (charts/pictures) are used to show examples.
Pupils’ Activity: Pupils observe the visual aids, listen to the explanations, and identify the two types of ground floors.
Learning Point: Pupils can differentiate between solid and suspended ground floors.

Step 4: Components of a Solid Ground Floor

Time: 7 minutes
Teaching Skill: Elaboration/Demonstration
Teacher’s Activity: The teacher focuses on the solid ground floor, explaining and listing its basic components (hardcore, blinding, DPM, concrete slab, screed, floor finish) one by one. The teacher may use the available materials (cement, sand, gravel) to demonstrate the layers or draw a simple section sketch on the board.
Pupils’ Activity: Pupils pay attention, ask questions about the materials and layers, and observe the sketch or demonstration.
Learning Point: Pupils learn the specific layers and materials that make up a solid ground floor.

Step 5: Simple Section Sketch of a Solid Ground Floor

Time: 3 minutes
Teaching Skill: Illustration/Instruction
Teacher’s Activity: The teacher draws a clear, simple section sketch of a solid ground floor on the board, labeling all the components. The teacher guides pupils on how to draw it.
Pupils’ Activity: Pupils attempt to draw the simple section sketch in their notebooks.
Learning Point: Pupils develop the skill to visually represent a solid ground floor structure.

Step 6: Site Observation Discussion

Time: 5 minutes
Teaching Skill: Application/Discussion
Teacher’s Activity: The teacher discusses what pupils should look out for if they were to visit a construction site where a ground floor is being built. This includes identifying materials, layers, and safety measures.
Pupils’ Activity: Pupils contribute ideas and ask questions about practical aspects of site observation.
Learning Point: Pupils understand how theoretical knowledge applies to real-world construction.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

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

Mention three functions of a ground floor.
State the two main types of ground floors.
List any four components of a solid ground floor.
What is the purpose of a Damp-Proof Membrane (DPM) in a solid ground floor?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, reiterating the functions and types of ground floors and their components. The teacher gives pupils homework: “Draw and label a simple section of a solid ground floor.”
Pupils’ Activity: Pupils listen to the summary and note down the homework assignment.
Learning Point: Pupils consolidate their understanding of the lesson.

Lesson Keywords

Ground floor – The floor of a building that is at or close to the ground level.
Solid floor – A ground floor that rests directly on the prepared ground beneath it.
Suspended floor – A ground floor that is raised above the ground, creating an air space underneath.
Damp-Proof Membrane (DPM) – A layer of material that prevents moisture from rising from the ground.
Hardcore – A base layer of broken material laid on the ground before concrete.
Blinding – A thin layer of fine material used to create a smooth surface over hardcore.

Differentiation

For pupils who grasp concepts quickly, the teacher can ask more challenging questions about the suitability of different floor types for various site conditions or the implications of not including a DPM. For pupils who need more support, the teacher will use more visual aids, provide clearer step-by-step instructions for drawing sketches, and offer simplified explanations of complex terms. Group work or peer tutoring can be encouraged to ensure all pupils participate and learn at their own pace.

Note for teachers using this lesson plan

Teachers should ensure that the visual aids (charts or real materials) are clear and accessible to all pupils. If a site visit is not feasible, consider using videos or detailed photographs to illustrate ground floor construction. Emphasize safety aspects when discussing construction sites. Encourage pupils to relate the lesson to buildings they see around them daily.