Floor Finishing Materials and Surface Preparation for SS 3

Class: SS 3
Term: First Term
Week: 8
Age: 14 years
Duration: 45 minutes
Subject: Building Construction
Curriculum Theme: Floor Finishes
Previous Lesson: Method of Detecting Defects in Plastering and Rendering
Topic: FLOOR FINISHES
Subject Matter: Description of floor finishing materials e.g. cement, cement screed, terrazzo, PVC, etc; Preparation of floor for finishing; Mix for floor finishing e. screed, PVC, etc

Specific Objectives

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

Cognitive Domain

• Describe various floor finishing materials such as cement, cement screed, terrazzo, and PVC.
• Explain the essential steps involved in preparing a floor for finishing.
• State the typical mix ratios for cement screed and terrazzo.

Affective Domain

• Appreciate the importance of proper floor preparation for durability and safety.
• Recognize the different characteristics (durability, noise level, safety) of various floor finishing materials.
• Participate actively in discussions about floor finishing techniques.

Psychomotor Domain

• Identify different types of materials used for floor finishes.
• Demonstrate the preparation of a simple cement screed mix.
• Outline the basic installation process for PVC flooring.

Reference Materials

The following resources were used in planning this lesson:

• 2025 Revised 9 Years Basic Education Curriculum
• Relevant State Unified Scheme of Work
• Building Construction for Senior Secondary Schools, Book 3
• The HeadTeacher Scheme of work

Instructional Materials

The teacher will teach this lesson with the aid of:

• Samples of floor finishing materials (e.g., cement, sand, gravel, granite, chipping, PVC tile)
• Tools and equipment such as shovel, head pan, spirit level, trowel
• Charts illustrating different floor finishes and preparation steps
• Pictures or videos of construction sites showing floor finishing work

Rationale for the Lesson

Understanding floor finishing materials and their proper application is fundamental in building construction. This lesson equips students with knowledge on selecting appropriate finishes, preparing subfloors correctly, and mixing or installing materials effectively. This knowledge is crucial for ensuring the durability, aesthetics, and safety of building floors.

Prerequisite/Previous Knowledge

Students should have a basic understanding of concrete work, types of building materials, and the structural components of a building, particularly the floor slab.

Lesson Content/Board Summary

FLOOR FINISHES

Description of Floor Finishing Materials

Floor finishing materials are applied to the structural floor to provide a durable, aesthetic, and functional surface. Common types include:

1. Cement Finish: A smooth, hard finish created by applying a rich cement mortar directly onto a concrete slab. It is durable and economical.
2. Cement Screed: A layer of cement and sand mortar applied over a concrete base to achieve a smooth, level surface. It often serves as a base for other floor finishes like tiles or carpets.
3. Terrazzo: A composite material used for floors, poured in place or precast. It consists of marble, quartz, granite, glass, or other suitable chips, mixed with a binder (cementitious or polymeric) and polished to a smooth, decorative surface.
4. PVC (Polyvinyl Chloride) Tiles/Sheets: A resilient flooring material made from synthetic plastic. It is durable, water-resistant, easy to clean, and comes in various colours and patterns. It is installed using adhesives.

Preparation of Floor for Finishing

Proper preparation of the subfloor is essential for the longevity and quality of the final finish. Key steps include:

1. Cleaning: Ensure the subfloor is entirely free from dirt, dust, oil, grease, and any loose debris.
2. Leveling: The subfloor must be level and even. Uneven surfaces should be patched or screeded to create a smooth, flat plane.
3. Drying: Ensure the subfloor is adequately dry, especially for finishes like PVC that are sensitive to moisture.
4. Repairing Cracks/Holes: Fill any cracks or holes in the subfloor with appropriate repair materials to prevent future issues.
5. Priming: Apply a primer or bonding agent for certain finishes to improve adhesion and prevent moisture penetration.

Mixes and Installation for Floor Finishing

The composition and application methods vary depending on the chosen material:

1. Cement Screed Mix:
   1. Typically a 1:3 or 1:4 mix of cement to sharp sand (by volume).
   2. Water is added to achieve a workable consistency.
   3. Laid to a specified thickness (e.g., 25-50mm), levelled, and compacted using a trowel or float.
   4. Requires proper curing (keeping it moist) for several days to achieve maximum strength and prevent cracking.
2. Terrazzo Mix:
   1. Consists of cement (often white or pigmented), marble/granite chips, and water.
   2. A common mix ratio for the topping might be 1 part cement to 2 parts aggregate (chips).
   3. Ebonite or metal strips are often used to create panels before pouring to control cracking and create patterns.
   4. After initial curing, the surface is ground and polished to expose the aggregate and achieve a smooth finish.
3. PVC Flooring Installation:
   1. PVC tiles or sheets are typically adhered to a clean, level, and dry subfloor.
   2. A suitable adhesive (e.g., acrylic-based) is spread evenly on the prepared subfloor using a notched trowel.
   3. The PVC material is carefully laid onto the adhesive, ensuring no air bubbles, and then rolled with a heavy roller for proper bond and to remove trapped air.

Teaching Methods/Instructional Techniques

Discussion, Demonstration, Guided Practice, Question and Answer, Explanation, Observation, Practical Activity

Instructional Procedures

Step 1: Introduction

Time: 5 minutes

Teaching Skill: Recalling/Engaging

Teacher’s Activity: The teacher greets the students and asks them to recall the previous lesson on structural floor components. The teacher then introduces the topic of floor finishes by asking students about the different types of floors they see in buildings around them.

Pupils’ Activity: Students respond to questions about previous lessons and share observations about different floor types.

Learning Point: Introduction to floor finishes

Step 2: Description of Floor Finishing Materials

Time: 8 minutes

Teaching Skill: Explaining/Identifying

Teacher’s Activity: The teacher displays samples or pictures of various floor finishing materials (cement, cement screed, terrazzo, PVC). The teacher describes each material, highlighting its characteristics, uses, durability, noise level, and safety aspects. Students are encouraged to identify the materials.

Pupils’ Activity: Students observe the samples/pictures, identify the materials, and listen to the descriptions, asking questions for clarification.

Learning Point: Types of floor finishes

Step 3: Preparation of Floor for Finishing

Time: 7 minutes

Teaching Skill: Explaining/Illustrating

Teacher’s Activity: The teacher explains the critical steps involved in preparing a subfloor before applying any finish. The teacher uses charts or diagrams to illustrate cleaning, leveling, drying, repairing, and priming processes. The teacher emphasizes why each step is important for a successful finish.

Pupils’ Activity: Students listen attentively, take notes, and ask questions about the floor preparation steps.

Learning Point: Floor preparation steps

Step 4: Mix for Cement Screed and Terrazzo

Time: 8 minutes

Teaching Skill: Demonstrating/Guiding

Teacher’s Activity: The teacher explains the typical mix ratios for cement screed and terrazzo. If possible, the teacher demonstrates a small-scale preparation of a cement screed mix using cement, sand, and water in the correct proportions. The teacher also explains the components of a terrazzo mix and the use of ebonite strips.

Pupils’ Activity: Students observe the demonstration, identify the materials used, and discuss the mix ratios and components for screed and terrazzo.

Learning Point: Screed and terrazzo mixes

Step 5: PVC Flooring Installation

Time: 5 minutes

Teaching Skill: Explaining/Describing

Teacher’s Activity: The teacher explains that PVC flooring is not “mixed” in the same way as screed or terrazzo, but rather installed using adhesives. The teacher describes the basic steps for installing PVC tiles or sheets, focusing on adhesive application and proper laying techniques.

Pupils’ Activity: Students listen to the explanation of PVC installation and ask questions about the process.

Learning Point: PVC installation method

Step 6: Site Visit Discussion (Preparation)

Time: 3 minutes

Teaching Skill: Planning/Engaging

Teacher’s Activity: The teacher discusses the plan for a potential visit to a construction site where floor finishing is ongoing. The teacher explains what students should observe and look out for regarding materials, preparation, and application techniques. The teacher also reiterates the durability, noise level, and safety aspects of the materials.

Pupils’ Activity: Students listen to the site visit plan and prepare to observe practical applications of floor finishes.

Learning Point: Practical application observation

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

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

1. Mention three types of floor finishing materials.
2. List two important steps in preparing a floor for finishing.
3. What is the typical mix ratio for cement screed?
4. How is PVC flooring generally installed?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Understanding floor finishes

Step 8: Note-Taking

Time: 4 minutes

Teaching Skill: Guided Writing

Teacher’s Activity: The teacher guides pupils/students to copy the essential Board Summary notes on floor finishing materials, preparation, and mixes/installation into their notebooks.

Pupils’ Activity: Pupils/students copy the notes carefully into their notebooks.

Learning Point: Recording lesson notes

Step 9: Conclusion

Time: 2 minutes

Teaching Skill: Summarizing

Teacher’s Activity: The teacher briefly summarizes the lesson by reiterating the importance of choosing appropriate floor finishes and ensuring proper preparation and application for durable and safe floors. The teacher encourages students to observe floor finishes in their environment.

Pupils’ Activity: Students listen to the summary and reflect on the lesson.

Learning Point: Reinforcement of key concepts

Continuous Assessment/Further Study

Type: Homework/Project

Instruction: Answer the following questions and prepare for a practical observation task.

1. Explain the difference between a cement finish and a cement screed.
2. Discuss the advantages and disadvantages of using terrazzo as a floor finish.
3. Research and list three types of adhesives commonly used for installing PVC flooring.
4. Visit a local building under construction (if safe and permissible) and identify at least two different floor finishing materials being used. Describe the preparation steps observed.

Lesson Keywords

• Floor Finish – The top layer applied to a floor structure for aesthetics, durability, and functionality.
• Cement Screed – A layer of cement and sand mortar used to level a floor or as a base for other finishes.
• Terrazzo – A composite floor finish made of aggregate chips and a binder, polished smooth.
• PVC Flooring – Resilient flooring made from polyvinyl chloride, installed with adhesive.
• Subfloor Preparation – The process of cleaning, leveling, and repairing the structural floor before applying a finish.
• Curing – The process of maintaining adequate moisture and temperature in concrete/mortar to ensure proper hydration and strength development.

Differentiation

For learners who may struggle, provide simplified diagrams of floor preparation steps and pre-labelled samples of materials. Pair them with faster learners for the practical demonstration of screed mixing. For faster learners, challenge them to research alternative floor finishing materials not covered in class, such as epoxy flooring or timber flooring, and present their findings.

Suggested Lesson Videos

Search on YouTube for: floor finishing materials and preparation building construction SS3

Teacher Guide for Using This Lesson Plan

This lesson plan focuses on practical understanding of floor finishes. Ensure you have actual samples of the materials (cement, sand, PVC tile, small chips for terrazzo) and basic tools like a head pan and shovel for a small-scale demonstration of screed mixing. Emphasize safety during any practical activity. Guide students to clearly identify and differentiate between the materials and understand the logical sequence of floor preparation. When discussing the site visit, stress safety protocols and what specific aspects of floor finishing students should observe. Encourage students to copy the Board Summary notes during Step 8 to ensure they have accurate information for future reference and examinations. Check for understanding frequently through questioning, especially during the description of materials and preparation steps. For weaker learners, provide extra visual aids and simplified explanations. For advanced learners, encourage critical thinking about material selection based on building function and budget.