Fire may damage electrical equipment and make the lifts inoperative

Lifts may automatically stop at a safe floor or ground floor and non-operational

Avoiding liability of lift manufacturers or contractor or developer

Lift shaft acting like a chimney, making smoke easy to spread

Lift shaft is not fire rated

Lack of maintenance and inspection

Wind load causing the rope to swing and repetitively hit the lift shaft

Mechanical failure causing the rope to snap near the engine room

Substandard material causing the rope to fail much faster than predicted

Late delivery of materials

Lower compressive strength after 28 days

Slower in gaining strength

More expensive

Lack of availability

Difficulty in transportation

Reduce shadows on surrounding buildings

Minimising environmental impact

Aesthetic reasons

Protecting the view of St Paul's Cathedral

Confusing the wind to reduce sway

Increases the size of structure

Complicated transportation and material handling

May not be available locally; needing to import

The material is quite heavy

Reduces stability

When the lift car is empty and it travels down, the system generates electricity

When the lift car is full and it travels down, the system generates electricity

The system always generates electricity when the lift car travels down

When the lift car is full and it travels up, the system generates electricity

reduction

recycling

absorption

reclamation

generation

A limit to the height of formwork

A stable ground

Cross and horizontal bracing

Enough vertical props and support, especially for table formwork

An adequately designed thickness of formwork

Using recycled concrete

Reducing the use of raw materials

Minimising the use of reinforcement steel

Replacing cement with waste or residual materials from other industries

Increasing concrete strength to reduce its size and material usage