Full Book

Purpose of health and safety legislation in construction

To protect the health, safety, and welfare of all people at work and those affected by work activities.

HASWA (definition and year)

Health and Safety at Work etc. Act 1974 — the main UK health and safety legislation.

General duty of an employer under HASWA 1974

To ensure, so far as is reasonably practicable, the health, safety, and welfare of all employees.

General duty of an employee under HASWA 1974

To take reasonable care of their own health and safety and that of others who may be affected by their actions.

HSE (Health and Safety Executive)

The body responsible for enforcing health and safety law in the UK.

Employers' Liability

The legal responsibility of an employer for injury or ill health suffered by an employee in the course of their work.

Public Liability

Legal responsibility for injury, loss, or damage suffered by a member of the public caused by business activities.

Code of Practice

Practical guidance approved by a regulatory body that explains how to comply with legal requirements.

Safe System of Work

A formal procedure developed to enable a task to be carried out safely at every stage.

Risk Assessment

A careful examination of what could cause harm, evaluating risks, and deciding on precautions.

Method Statement

A document detailing step-by-step how a specific job will be carried out safely.

Hazard

Anything that has the potential to cause harm.

Risk

The likelihood that harm will occur and the severity of that harm.

Key focus areas of a work environment safety inspection

Trip hazards, flooring, lighting, ventilation, fire exits, waste accumulation, equipment condition, and noise levels.

Consequences of non-compliance with health and safety legislation

Fines, prosecution, imprisonment, injury or death, project delays, higher insurance costs, and damage to reputation.

Procedure for safe isolation of systems

Identify $\rightarrow$ Notify $\rightarrow$ Switch off $\rightarrow$ Isolate $\rightarrow$ Prove dead $\rightarrow$ Work $\rightarrow$ Test $\rightarrow$ Restore $\rightarrow$ Notify.

Effects of poor health and safety on building performance

System damage, unsafe conditions, legal non-compliance, reduced efficiency, and downtime.

Accident

An unplanned event that causes injury, ill health, or damage to property.

Near Miss

An event that had the potential to cause harm, injury, or damage but did not.

RIDDOR

Reporting of Injuries, Diseases and Dangerous Occurrences Regulations.

Reportable incidents under RIDDOR

Deaths, specified injuries, over-7-day injuries, occupational diseases, and dangerous occurrences.

Emergency Procedure

Pre-planned steps to follow in an emergency, including evacuation routes, assembly points, contact persons, and reporting protocols.

Mandatory safety signs (appearance and meaning)

Blue circle with a white symbol — indicates an action that MUST be carried out.

Warning safety signs (appearance and meaning)

Yellow triangle with a black border — warns of a specific danger or hazard.

Prohibition safety signs (appearance and meaning)

Red circle with a diagonal red line — indicates an action that must NOT be done.

Safe condition signs (appearance and meaning)

Green square or rectangle — indicates safe conditions, emergency exits, or first aid equipment.

Fire equipment signs (appearance and meaning)

Red square or rectangle — indicates the location of firefighting equipment.

PPE

Personal Protective Equipment.

Examples of Personal Protective Equipment (PPE)

Hard hat, safety glasses, gloves, high-visibility clothing, safety boots, ear defenders, and dust mask.

First aid requirements on a construction site

An appointed person, a suitably stocked first aid kit, and clearly displayed information regarding first aid arrangements.

COSHH

Control of Substances Hazardous to Health.

Flammable substance symbol

Flame symbol — indicates that a substance can easily ignite and catch fire.

Corrosive substance symbol

Corrosion symbol — indicates that a substance can cause severe damage to skin, eyes, and materials.

Toxic substance symbol

Skull and crossbones — indicates that a substance can cause death or serious health risk if inhaled, ingested, or absorbed.

Irritant substance symbol

Exclamation mark — indicates that a substance may cause skin/eye irritation or allergic reactions.

Pre-use ladder inspection checks

Inspect stiles, rungs, and feet for damage; ensure feet are clean with good grip; verify base is firm and secure.

3-points-of-contact rule for ladders

Maintaining contact with the ladder using either two hands and one foot or two feet and one hand at all times.

Manual Handling Operations Regulations hierarchy

Avoid $\rightarrow$ Assess $\rightarrow$ Reduce $\rightarrow$ Provide information $\rightarrow$ Review.

Confined space

Any space that is substantially enclosed and presents a risk of serious injury from fire, explosion, hazardous gas, oxygen deficiency, or flooding.

Main hazards in excavation work

Collapse of excavation sides, falling materials, water ingress, contact with underground services, and people or vehicles falling in.

Safety precautions for working in excavations

Support/batter sides, install edge protection, provide safe access/egress, detect underground services, conduct daily inspections, and keep stop banks clear.

SI Units

International System of Units — the standard metric system used in scientific and construction applications.

SI unit for length

Metre ($\text{m}$) — with millimetres ($\text{mm}$) commonly used in construction.

SI unit for mass

Kilogram ($\text{kg}$).

SI unit for time

Second ($\text{s}$).

SI unit for temperature

Kelvin ($\text{K}$) — though Celsius ($^\circ\text{C}$) is also widely used.

Derived SI unit

A unit formed by combining base SI units (e.g., $\text{m}^2$ for area, $\text{m}^3$ for volume).

Density

Mass per unit volume — measured in $\text{kg}/\text{m}^3$.

Tensile strength

A material's ability to resist tension forces that pull it apart.

Compressive strength

A material's ability to resist compressive forces that squash or crush it.

Thermal conductivity

A measure of how well a material conducts heat — measured in $\text{W}/(\text{m}\cdot\text{K})$.

Elasticity

The ability of a material to return to its original shape once deforming forces are removed.

Plastic deformation

Permanent deformation of a material that persists after the applied load is removed.

Friction

A resistive force opposing relative motion between two surfaces in contact.

Formula for pressure

$\text{Pressure} = \frac{\text{Force}}{\text{Area}}$ ($P = \frac{F}{A}$)

Units of pressure

Pascals ($\text{Pa}$) or Newtons per square metre ($\text{N}/\text{m}^2$).

Moment of a force

The turning effect of a force — calculated as $\text{Moment} = \text{Force} \times \text{Perpendicular distance from pivot}$.

Lever

A rigid bar that pivots around a fulcrum to amplify applied mechanical force.

Electric current

The rate of flow of electric charge (electrons) — measured in Amperes ($\text{A}$).

Voltage (Electric Potential Difference)

The electrical potential difference or force pushing current around a circuit — measured in Volts ($\text{V}$).

Electrical resistance

The opposition to the flow of electric current through a conductor — measured in Ohms ($\Omega$).

Ohm's Law

$V = I \times R$ (Voltage = Current $\times$ Resistance).

Series circuit

An electrical circuit where components are connected sequentially in a single path, so the same current flows through all components.

Parallel circuit

An electrical circuit where components are connected across separate branches, so each branch receives the same voltage.

Direct Current (DC)

Electric current that flows continuously in a single direction (e.g., from batteries).

Alternating Current (AC)

Electric current that periodically reverses direction (e.g., mains electricity).

Potential energy

Energy stored within an object due to its position, state, or configuration.

Kinetic energy

Energy possessed by an object due to its motion.

Mechanical stress

Internal force exerted per unit cross-sectional area within a material — $\text{Stress} = \frac{\text{Force}}{\text{Area}}$.

Mechanical strain

The fractional deformation caused by stress — $\text{Strain} = \frac{\Delta L}{L_0} = \frac{\text{Change in length}}{\text{Original length}}$.

Heat

Thermal energy transferred between systems due to a temperature difference.

Temperature

A measure of the average kinetic energy of particles within a substance.

Conduction (thermal)

Transfer of heat energy through direct physical contact within solids via particle vibration.

Convection

Transfer of heat in fluids (gases or liquids) driven by density differences, causing warmer fluid to rise and cooler fluid to sink.

Radiation (thermal)

Transfer of thermal energy via electromagnetic (infrared) waves without requiring a physical medium.

Specific heat capacity

The amount of heat energy required to raise the temperature of $1\,\text{kg}$ of a substance by $1\,^\circ\text{C}$.

Latent heat

Heat energy absorbed or released by a substance during a phase change without a change in temperature.

U-value

Thermal transmittance rating measuring heat loss rate through a building element — lower values indicate better thermal insulation.

R-value

Thermal resistance of a material layer — higher values indicate greater resistance to heat flow.

Light

Electromagnetic radiation visible to the human eye, traveling in straight lines at approximately $3 \times 10^8\,\text{m/s}$ in a vacuum.

Luminous flux

The total perceived power of light emitted by a source — measured in Lumens ($\text{lm}$).

Illuminance

The total luminous flux incident on a surface per unit area — measured in Lux ($\text{lx}$).

Inverse Square Law for light

Illuminance on a surface is inversely proportional to the square of its distance from the light source ($E \propto \frac{1}{d^2}$).

Reflection of light

The bouncing back of light waves when they strike a boundary surface.

Refraction of light

The bending of light rays when transitioning between media with different optical densities.

Sound

A mechanical longitudinal wave produced by vibrations, requiring a physical medium to propagate.

Sound frequency

The number of sound wave cycles per second — measured in Hertz ($\text{Hz}$) — determining acoustic pitch.

Sound wavelength

The spatial distance between two corresponding points on consecutive sound waves.

Sound amplitude

The maximum displacement of vibrating particles from their equilibrium position — determining sound volume/loudness.

Unit of sound pressure level

Decibels ($\text{dB}$).

Sound absorption

The process by which acoustic energy is absorbed by a material rather than reflected back.

Sound transmission

The passage of sound energy through a barrier or structure from one side to another.

Purpose of the design process in construction

To transform client requirements into a fully detailed, fit-for-purpose building design.

Main stages of the construction design process

Brief $\rightarrow$ Feasibility $\rightarrow$ Concept design $\rightarrow$ Detailed design $\rightarrow$ Construction documentation $\rightarrow$ Construction $\rightarrow$ Handover.

Design brief

A foundational document detailing all client requirements, objectives, and constraints for a construction project.

Feasibility study

An evaluation of a proposed project to determine its technical, financial, and legal viability.

Specification (construction)

A written document detailing materials, standards, workmanship, and quality requirements for a project.

Inclusive design

Designing spaces and buildings so they can be accessed, understood, and used by all people regardless of age, disability, or background.

Role of an architect

Leads the overall architectural design (aesthetics, layout, functionality) and coordinates the design team.

Role of a structural engineer

Designs load-bearing frameworks to ensure structural integrity, stability, and safety.