Lay superstructure walls form the vertical framework that supports the upper floors and roof of a building, playing a crucial role in ensuring structural stability and durability. In Kenya’s building industry, mastery of wall construction is essential for building technologists, particularly when working on residential, commercial, and institutional projects. This chapter focuses on the personal protective equipment (PPE) necessary for safe wall construction and the specialized tools and equipment required to execute wall laying efficiently and to the highest standards.

2.1 PPEs

The use of Personal Protective Equipment (PPE) in construction sites cannot be overstated, especially during superstructure wall laying where risks such as falling debris, dust inhalation, and physical injuries are prevalent. Kenya’s Occupational Safety and Health Act mandates the use of appropriate PPE to protect workers and reduce accident rates. Building technologists must ensure that all workers on site are equipped with the right PPE to maintain a safe working environment and comply with legal requirements.

2.1.1 Types of PPE

Different stages and tasks in wall construction require specific types of PPE to address the various hazards present. Understanding these types aids in selecting the correct equipment for each worker’s role.

Head Protection

• Hard hats are designed to protect against falling objects and head injuries. They are essential when handling heavy blocks or bricks, particularly on multi-storey sites such as county government offices constructing additional floors.

• Helmets with chin straps ensure the headgear stays secure even when workers move or bend frequently.

Eye Protection

• Safety goggles shield eyes from dust, cement particles, and flying debris generated during mixing mortar or cutting blocks.

• Anti-fog and impact-resistant goggles are preferable on sites such as hospitals, where maintaining clear vision is critical for precise work.

Hand Protection

• Work gloves protect hands from abrasions, cuts, and chemical irritants found in cement and mortar.

• Gloves made from leather or rubber provide durability and resistance to punctures during bricklaying tasks in retail business construction.

Foot Protection

• Steel-toe boots guard feet against heavy falling objects and sharp debris on the ground.

• Non-slip soles ensure stability on wet or uneven surfaces common at construction sites like schools.

Respiratory Protection

• Dust masks or respirators prevent inhalation of fine dust from cement, sand, and lime, which can cause respiratory issues.
• Respirators with replaceable filters are necessary on dusty sites such as agricultural cooperative buildings where natural materials generate significant airborne particles.

2.1.2 Uses of PPE

The effectiveness of PPE depends on its correct usage and maintenance on site. Building supervisors must enforce procedures that ensure PPE is worn consistently and appropriately.

Protection from Physical Injuries

• PPE such as helmets and gloves minimize the risk of cuts, bruises, and fractures during manual handling of blocks and tools, especially in hotel construction sites where heavy materials are frequently moved.

Prevention of Respiratory Conditions

• Dust masks reduce the risk of silicosis and other respiratory diseases caused by inhaling fine particulate matter during mortar mixing in university building projects.

Enhancing Worker Confidence and Productivity

• Workers who feel safe are more focused and efficient. For example, at banking hall extensions, workers equipped with proper PPE complete wall laying with fewer accidents and delays.

Compliance with Legal Standards

• Using PPE ensures adherence to Kenya’s OSHA regulations and avoids costly penalties or work stoppages in government office construction.

Minimizing Cross-Contamination

• Gloves and masks prevent the transfer of harmful substances from construction materials to skin or respiratory tracts, which is vital in healthcare facility expansions.

Chapter Summary

This chapter covered the essential aspects of laying superstructure walls, beginning with the different types of personal protective equipment necessary for safe construction work. It then examined the variety of wall construction tools and equipment, highlighting their specific uses and the importance of accurate usage reports. The construction of various wall types was explored, including external, partitioning, and cavity walls, each with distinct structural roles. Key walling materials such as cement, fine aggregate, walling units, hoop iron, and water were discussed for their properties and contributions to wall integrity. The process of screeding was explained as a method to achieve a level surface, while the function and application of damp proof courses were outlined to prevent moisture ingress. The chapter also addressed the proper erection of construction walls and the management of waste materials with an emphasis on reuse to promote sustainability. Finally, it emphasized the importance of creating wall openings for doors and windows and the curing process necessary to ensure the durability and strength of the superstructure walls.