Roof Covering Materials and Fixing Methods for SS 3

Class: SS 3
Term: First Term
Week: 2
Age: 16 years
Duration: 45 minutes
Subject: Building Construction
Curriculum Theme: Roof Covering
Previous Lesson: Scaling, Enlargement and Reduction in Drawings
Topic: ROOF COVERING
Subject Matter: Roof covering materials; Fixing of roof covering materials; Protection of roof from rain, wind, lightening etc

Specific Objectives

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

Cognitive Domain

• Identify at least four common roof covering materials.
• Describe the general procedures for fixing roof covering materials.
• Explain at least three reasons for protecting roofs from rain, wind, and lightning.

Affective Domain

• Appreciate the importance of selecting appropriate roof covering materials.
• Recognise the need for proper fixing methods to ensure roof stability.
• Value the safety measures involved in protecting roofs from natural elements.

Psychomotor Domain

• Distinguish between different roof covering materials by observation.
• Illustrate, through sketches or verbal descriptions, methods of fixing roof materials.
• Point out features on a roof that provide protection against rain, wind, or lightning.

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:

• Sample roof covering materials (e.g., pieces of aluminium sheet, asphalt shingle, concrete tile)
• Flashing concrete samples
• Facial boards
• Diagrams or charts showing roof fixing details
• Pictures of roofs with lightning conductors

Rationale for the Lesson

This lesson is important as it provides students with essential knowledge about the materials used for roof covering and their proper installation. Understanding these concepts helps ensure the durability, safety, and aesthetic appeal of buildings. It also prepares students for practical applications in the building construction industry.

Prerequisite/Previous Knowledge

Students should have basic knowledge of roof components such as trusses, rafters, purlins, and the general structure of a roof from previous lessons.

Lesson Content/Board Summary

ROOF COVERING

Roof Covering Materials

Roof covering materials are the outermost layer of a roof, designed to protect the building from weather elements like rain, wind, and sun. The choice of material depends on factors such as climate, cost, durability, and aesthetic preference.

Common roof covering materials include:

1. Aluminium Sheets: Lightweight, durable, corrosion-resistant, and available in various colours and profiles. They are good for large spans and low-pitched roofs.
2. Asphalt Shingles: Made from asphalt and mineral granules, these are popular for their affordability, ease of installation, and wide range of colours. They are common on residential buildings.
3. Concrete Tiles: Heavy, durable, fire-resistant, and available in many shapes and colours. They provide good insulation and resistance to harsh weather.
4. Clay Tiles: Traditional, durable, and aesthetically pleasing, offering excellent fire resistance and long lifespan. They are often used in Mediterranean or traditional architectural styles.
5. Galvanized Iron (G.I.) Sheets: Steel sheets coated with zinc to prevent rust. They are economical, strong, and relatively easy to install, commonly used in various building types.
6. Fibre Cement Sheets: Made from cement, cellulose fibres, and water, these sheets are durable, fire-resistant, and resistant to rot and pests.

Fixing of Roof Covering Materials

The method of fixing roof covering materials varies depending on the material and the roof structure. Proper fixing ensures the roof covering remains secure against wind uplift and other forces.

General principles for fixing include:

1. Preparation: Ensure the roof substructure (purlins, battens, rafters) is sound, level, and properly spaced according to the material specifications.
2. Overlap: Most roof covering materials require specific overlap dimensions to prevent water penetration.
3. Fasteners: Use appropriate fasteners (nails, screws, clips) made of corrosion-resistant materials (e.g., galvanized, stainless steel) to secure the covering to the substructure.
4. Flashing: Install flashing at junctions, valleys, hips, and penetrations (e.g., chimneys, vents) to prevent water leakage. Flashing can be made of metal (aluminium, lead) or flexible membranes.
5. Edge Details: Secure the edges of the roof covering properly, often using fascia boards, bargeboards, or drip edges to protect the eaves and verges.
6. Sequence of Installation: Typically, roof coverings are installed from the eaves upwards towards the ridge, ensuring proper overlap and drainage.

Protection of Roof from Rain, Wind, and Lightning

Roofs require protection to ensure the longevity of the structure and the safety of occupants.

Protection from Rain:

1. Waterproof Materials: Using materials that are inherently waterproof or have waterproof coatings (e.g., asphalt shingles, metal sheets, tiles).
2. Proper Pitch: Designing the roof with an adequate slope (pitch) to ensure efficient drainage of rainwater.
3. Overlaps and Joints: Ensuring all overlaps and joints are correctly sealed and installed to prevent water ingress.
4. Flashing: Installing metal or membrane flashing at critical points like valleys, chimneys, and vents to divert water.
5. Gutters and Downpipes: Installing a functional gutter and downpipe system to collect and channel rainwater away from the building foundation.

Protection from Wind:

1. Secure Fixing: Using strong, corrosion-resistant fasteners that are adequately spaced to hold the roof covering firmly to the substructure, preventing uplift.
2. Wind Straps/Clips: Employing specialized clips or straps, especially in high-wind areas, to further secure roof components.
3. Edge Reinforcement: Reinforcing eaves, verges, and ridges with strong fascias, bargeboards, and ridge caps that are securely fixed to resist wind forces.
4. Aerodynamic Design: Designing roof shapes that minimize wind resistance, such as hip roofs, which are generally more wind-resistant than gable roofs.

Protection from Lightning:

1. Lightning Conductors (Lightning Rods): Installing a lightning protection system consisting of air terminals (rods) at the highest points of the roof, down conductors, and earthing electrodes.
2. Earthing System: Ensuring the lightning conductor system is properly earthed to safely dissipate lightning current into the ground.
3. Bonding: Electrically connecting all metallic parts of the roof (e.g., metal pipes, air conditioning units) to the lightning protection system to prevent side flashes.
4. Regular Inspection: Periodically inspecting the lightning protection system to ensure it is in good working order and free from damage.

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: Engaging/Activating Prior Knowledge

Teacher’s Activity: The teacher greets the students and asks them to recall the different parts of a roof structure discussed in the previous lesson. The teacher then introduces the topic of roof covering, emphasizing its importance in protecting a building.

Pupils’ Activity: Students respond by naming roof parts like rafters, purlins, and trusses. They listen attentively to the introduction of the new topic.

Learning Point: Introduction to roof covering

Step 2: Roof Covering Materials

Time: 8 minutes

Teaching Skill: Explanation/Demonstration

Teacher’s Activity: The teacher explains what roof covering materials are and presents various samples (e.g., aluminium, concrete tile, asphalt shingle). The teacher highlights the characteristics and common uses of each material.

Pupils’ Activity: Students observe the samples, identify the materials, and ask questions about their properties and applications.

Learning Point: Identification of roof materials

Step 3: Types of Roof Covering Materials

Time: 7 minutes

Teaching Skill: Elaboration/Classification

Teacher’s Activity: The teacher further elaborates on specific types of roof covering materials, discussing their advantages and disadvantages, and showing pictures or diagrams of their installation. The teacher encourages students to share examples of buildings they have seen with these materials.

Pupils’ Activity: Students contribute examples and discuss the pros and cons of different materials based on the teacher’s explanation.

Learning Point: Characteristics of materials

Step 4: Fixing of Roof Covering Materials

Time: 8 minutes

Teaching Skill: Explanation/Procedural Guidance

Teacher’s Activity: The teacher explains the general principles and procedures for fixing roof covering materials, emphasizing the importance of proper overlaps, fasteners, and flashing. The teacher may use diagrams to illustrate these points.

Pupils’ Activity: Students listen to the explanation, observe the diagrams, and take notes on the fixing procedures.

Learning Point: Roof material fixing procedures

Step 5: Demonstrating Fixing Methods

Time: 5 minutes

Teaching Skill: Practical Demonstration

Teacher’s Activity: Using small models or diagrams, the teacher demonstrates how flashing is applied at roof junctions and how fascia boards are used. The teacher also shows examples of appropriate fasteners.

Pupils’ Activity: Students observe the demonstration and ask clarifying questions about the practical application of fixing methods.

Learning Point: Practical fixing techniques

Step 6: Protection of Roofs

Time: 5 minutes

Teaching Skill: Explanation/Illustrative

Teacher’s Activity: The teacher explains the reasons for protecting roofs from rain, wind, and lightning. The teacher discusses methods like proper pitch, gutters, secure fastening, and lightning conductors, showing relevant images.

Pupils’ Activity: Students listen and identify reasons for roof protection, relating them to safety and durability.

Learning Point: Reasons for roof protection

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. Name three common roof covering materials.
2. Briefly describe one method of fixing roof covering materials.
3. State two reasons why roofs need protection from rain.
4. How can a roof be protected from lightning?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Assessment of understanding

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 roof covering materials, fixing methods, and protection into their notebooks.

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

Learning Point: Recording lesson content

Step 9: Conclusion

Time: 3 minutes

Teaching Skill: Summarizing/Reinforcement

Teacher’s Activity: The teacher briefly summarizes the key points of the lesson, reiterating the importance of selecting appropriate materials, using correct fixing methods, and ensuring adequate protection for roofs. The teacher encourages students to observe roofs around them.

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

Learning Point: Consolidation of knowledge

Continuous Assessment/Further Study

Type: Project/Observation

Instruction: Students are to undertake the following tasks:

1. Observe roofs in their community and identify at least three different roof covering materials used. For each material, describe its appearance and suggest a possible fixing method.
2. Draw a simple sketch of a roof section showing how flashing might be used at a chimney or valley.
3. Research the local regulations or common practices for lightning protection in buildings within your state.

Lesson Keywords

• Aluminium Sheets – Lightweight, corrosion-resistant metal sheets used for roof covering.
• Asphalt Shingles – Roof covering material made from asphalt and mineral granules.
• Concrete Tiles – Heavy, durable, and fire-resistant roof covering units.
• Flashing – Material used to prevent water penetration at roof junctions and penetrations.
• Fascia Boards – Boards fixed to the ends of rafters at the eaves, supporting gutters and protecting the roof edge.
• Lightning Conductor – A metal rod or strip installed on a building to protect it from lightning strikes.
• Pitch – The slope or angle of a roof.

Differentiation

For students who grasp concepts quickly, encourage them to research advanced roof covering technologies or sustainable roofing materials. For students needing more support, provide simplified diagrams of fixing methods and assign pair work to discuss the functions of different roof protection elements.

Suggested Lesson Videos

For further understanding, search on YouTube for:
SS3 Building Construction Roof Covering Materials
Roof Fixing Methods Building Construction
Roof Protection from Rain Wind Lightning

Teacher Guide for Using This Lesson Plan

Teachers should prepare by gathering actual samples of various roof covering materials, if possible, or clear visual aids like diagrams and pictures. Begin the lesson by linking to students’ prior knowledge of roof structures to set the context. Systematically explain each type of roof covering material, demonstrating their characteristics and suitable fixing methods. Emphasize the practical aspects of installation and the critical importance of protecting roofs from environmental damage. Encourage active participation through questions and discussions. During Step 8, ensure students copy the Board Summary accurately. For the continuous assessment, guide students on how to conduct their observations and research effectively, encouraging them to consider local building practices. Ensure safety is highlighted when discussing site visits or practical demonstrations.