Building temporary works requires strict adherence to safety protocols to protect workers from hazards associated with construction activities. Timbering works, which involve supporting excavations and trenches, expose workers to risks such as falling objects, collapsing soil, and sharp tools. Personal protective equipment (PPE) serves as the last line of defense in minimizing injuries and ensuring safe working conditions. In Kenya, institutions like county referral hospitals and large-scale farms emphasize the use of appropriate PPE to comply with the Occupational Safety and Health Act and safeguard their workforce during temporary works.

1.1 PPEs

PPEs are specialized gear designed to protect workers against physical, chemical, and biological hazards encountered during timbering and other temporary works. Their proper selection, use, and maintenance are critical to preventing accidents that could lead to serious injuries or fatalities. In the context of Kenyan workplaces, PPE usage is mandated by law and reinforced through workplace safety policies at organizations such as universities and retail businesses.

1.1.1 Types

Understanding the various types of PPE relevant to timbering works is essential for effective hazard mitigation. Each type protects different parts of the body and addresses specific risks associated with the work environment.

Head Protection

• Hard hats are designed to protect the skull from impact injuries caused by falling objects or accidental bumps against timber supports. They are typically made from high-density polyethylene and have an adjustable suspension system to ensure a secure fit.

Yellow and white hard hats in a wooden crate (Source: Wikimedia Commons)

• In a large county government office construction site, workers use hard hats to prevent head injuries from loose timber or tools falling from scaffolds.

Eye and Face Protection

• Safety goggles and face shields guard against dust, flying debris, and splinters generated when cutting or shaping timber. They prevent eye injuries that can cause temporary or permanent vision impairment.
• Employees in a university workshop use goggles when cutting timber for temporary formwork to avoid eye irritation and injury.

Hand Protection

• Work gloves, often made from leather or reinforced fabric, protect hands from splinters, cuts, and abrasions during handling of timber and nails. Some gloves also offer chemical resistance if preservatives or adhesives are used.
• Farm workers engaged in constructing timber supports for irrigation trenches benefit from gloves to maintain hand safety and grip.

Foot Protection

• Safety boots with steel toes protect feet from heavy falling objects and provide stability on uneven or slippery surfaces. They also reduce the risk of puncture wounds from nails or sharp objects on the ground.
• At a retail warehouse setting, workers involved in timber stacking wear safety boots to prevent foot injuries from dropping planks.

Respiratory Protection

• Dust masks or respirators are necessary when cutting or sanding timber to prevent inhalation of sawdust, which can cause respiratory irritation or long-term lung problems.
• In a hospital maintenance department, workers wear dust masks during timber repairs to maintain respiratory health.

1.1.2 Uses

PPE must be used correctly and consistently to provide the intended protection during timbering works. Its effectiveness depends on matching the PPE type to the specific hazard and the work being performed.

Protection Against Falling Objects

• Hard hats must be worn whenever there is a risk of tools, timber pieces, or debris falling from height during the erection or dismantling of temporary supports. This is common in school construction sites where timber formwork is assembled overhead.

Safeguarding Eyes from Particulates

• Workers involved in cutting or shaping timber must wear goggles or face shields to prevent injuries from flying chips and dust, ensuring uninterrupted vision and safety during precision tasks.

Hand Safety During Handling

• Gloves are essential when lifting, carrying, or nailing timber to protect against splinters and sharp edges. In cooperative farming projects, this reduces the incidence of hand injuries among laborers.

Foot Protection on Uneven Terrain

• Safety boots provide grip and protect feet from heavy timber falling or rolling. In hotel landscaping projects involving timber retaining walls, boots prevent foot injuries on rough ground.

Respiratory Health Maintenance

• Dust masks prevent inhalation of fine timber particles and chemical fumes from preservatives, reducing occupational respiratory diseases among workers in retail furniture assembly workshops.

1.1.3 Identification

Proper identification and differentiation of PPE ensure that workers select the right equipment for their tasks and maintain compliance with safety standards. In Kenyan workplaces, clear markings and colour coding assist in PPE management.

Colour Coding Systems

• Many organizations use colour codes to identify PPE types and their intended users. For instance, in a county hospital construction site, yellow helmets might designate supervisors while white helmets are for general workers, facilitating quick recognition and role clarity.

Markings and Labels

• PPE items typically bear manufacturer labels indicating compliance with safety standards such as the Kenya Bureau of Standards (KEBS). This helps workers and safety officers verify the quality and suitability of the equipment.

Inspection Tags

• Some PPE, like harnesses or respirators, have inspection tags with dates of last service or expiry, ensuring only safe and functional equipment is used. A university workshop maintains records of PPE inspections to guarantee worker safety.

Storage and Accessibility

• Clearly labelled storage areas for different PPE types improve organization and ensure that workers can easily access the correct equipment when needed, as practiced in large retail warehouses.

Training and Awareness

• Identification also involves training workers to recognize the correct PPE for specific hazards. County government offices conduct regular safety briefings to reinforce PPE knowledge and proper use.

Chapter Summary

This chapter explored the essential aspects of performing timbering works in building temporary structures. It began with a detailed overview of personal protective equipment, covering various types, their specific uses, and how to properly identify them to ensure worker safety. The discussion then moved to the different timbering tools and equipment, explaining their types and practical applications on site. A significant portion addressed trench timbering, emphasizing the techniques required to secure excavation sites effectively. The chapter further examined the procedures for erecting timbering structures, highlighting the critical steps for safe and stable installation. It also covered the dismantling process, ensuring that timbering removal is conducted safely without compromising the work environment. Finally, the chapter concluded with methods for storing timbering materials, stressing proper storage techniques to maintain material quality and readiness for future use.