Understanding the Construction Sequence of a Modern Hydraulic Roof Concert Stage

Large outdoor concert stages appear to rise almost effortlessly within a few days.

To spectators, it often looks as though a complete stage simply appears overnight.

In reality, every component follows a carefully planned construction sequence. The roof, supporting columns, hydraulic lifting system, rigging points and suspended equipment must all be assembled in the correct order to ensure structural safety, installation efficiency and reliable operation.

Modern concert stages are only one part of a much larger temporary event system. Before reading this article, you may also be interested in understanding Why Are Large Concert Stages Built Inside Stadiums? and Understanding the Layout of a Large Stadium Concert, which explain why the stage is positioned and organised in this way.

During the construction of the 2026 Guangzhou Pearl Beer Festival Music Festival, we observed the installation of a modern hydraulic roof stage. Unlike traditional chain-hoist roof systems, this stage used an electric-cylinder lifting roof combined with Ringlock structures and aluminium roof trusses.

Engineering Observation

The main stage observed during this project consisted primarily of:

• A hydraulic lifting roof system

• Four steel lifting columns

• Steel supporting framework

• Curved aluminium roof trusses

• Integrated roof membrane

• Front rain apron

• Front LED frame

• Suspended rigging system

• Main line array loudspeakers

Together, these systems formed the structural core of the concert, while additional Ringlock structures, sound reinforcement systems and performance extensions were constructed around it to complete the venue.

Stage Construction Sequence

Phase 1 — Establish the Stage Centre Line

Construction begins by establishing the centre line of the stage.

This reference line determines the position of every major structural component, including the roof columns, front beam, LED wall and performance area.

Any error introduced at this stage will affect the alignment of the entire structure.

Phase 2 — Locate the Four Main Columns

Once the centre line has been confirmed, the positions of the four main roof columns are accurately marked.

These four columns define the footprint of the hydraulic roof system and become the primary structural supports for the entire stage roof.

Accurate positioning is essential because the roof must remain square throughout the lifting process.

Phase 3 — Install the Steel Base Frames

Heavy-duty steel bases are installed beneath each lifting column.

These bases transfer the roof loads into the temporary foundation system while providing sufficient stability during the lifting process.

Unlike conventional scaffold structures, the hydraulic lifting force is transmitted directly through these bases.

Phase 4 — Install the First Column Sections

The first sections of the steel lifting columns are assembled onto the base frames.

These initial sections provide enough height for the installation of the hydraulic lifting cylinders while maintaining stability during early assembly.

Phase 5 — Install the Hydraulic Lifting Cylinders

Four electric lifting cylinders are then installed between the lower and upper column sections.

Unlike chain-hoist roof systems, where lifting equipment hangs above the roof, the lifting mechanism in this design remains at ground level.

The hydraulic cylinders push the roof upward from below rather than pulling it upward from above.

This difference fundamentally changes the entire construction sequence.

Phase 6 — Install the Second Column Sections

After the lifting cylinders have been secured, the second column sections are assembled.

At this stage, the complete lifting system begins to take shape and is ready to support roof installation.

Phase 7 — Assemble the Roof Beams

The primary steel roof beams are installed between the four columns.

These beams establish the structural frame that supports the roof trusses, lighting loads and suspended production equipment.

Once completed, the roof begins to resemble its final structural geometry while still remaining close to ground level.

The roof beams also provide the primary connection points for the lighting trusses, which later support hundreds of lighting fixtures used during the performance. Readers unfamiliar with these structures may also find our Lighting Truss guide helpful.

Phase 8 — Assemble the Curved Aluminium Roof Structure

The roof itself consists of curved aluminium trusses supporting the roof membrane.

Choosing aluminium instead of steel provides several engineering advantages.

First, aluminium significantly reduces the dead load carried by the hydraulic lifting system.

Reducing roof weight lowers the forces transmitted through the lifting cylinders, columns and foundations while improving installation efficiency.

This lightweight philosophy is widely used throughout modern Truss System engineering, where aluminium provides an excellent balance between strength, weight and transportation efficiency.

Second, aluminium offers a smooth, corrosion-resistant surface that is particularly well suited for tensioned roof membranes.

The roof fabric can be stretched tightly across the curved aluminium framework, producing a cleaner surface with fewer wrinkles and better rainwater drainage.

This smooth surface also reduces the likelihood of water ponding during heavy rainfall, an important consideration for outdoor concerts during Guangzhou's summer rainy season.

Phase 9 — Install Rigging Equipment Before Lifting

One of the most interesting observations during this project was that rigging equipment was installed before the roof was raised.

Safety lifelines, chain hoists and suspension points were prepared while the roof remained at ground level.

Working close to the ground greatly improves installation safety compared with assembling these components after the roof has already reached its final height.

It also allows lighting trusses, motors and other suspended production equipment to be installed more efficiently during subsequent construction phases before the complete Stage Lighting system is commissioned.

It also allows lighting trusses, motors and other suspended production equipment to be installed more efficiently during subsequent construction phases.

Phase 10 — Install the Roof Membrane Before Lifting

Unlike traditional chain-hoist roof systems, this hydraulic design allows the roof membrane to be installed almost completely before lifting begins.

In conventional roof systems, portions of the roof covering near the lifting towers often remain open because the towers must pass upward through the roof structure during lifting.

Only after the roof reaches its final elevation can these remaining sections be completed.

In contrast, the electric-cylinder lifting system pushes the columns upward from below.

Because the lifting mechanism is located at the base rather than above the roof, the roof membrane can be installed almost entirely while the structure is still at working height.

During this stage, the front rain apron is also assembled.

This extended roof projection improves weather protection by directing rainwater away from the front performance area while providing additional shelter for performers and equipment.

Phase 11 — Install the Front Beam

After the roof membrane has been completed, the front beam is assembled.

This beam supports several important production systems, including the main front lighting positions and the primary line array loudspeakers.

Because it projects beyond the main roof, it also contributes to the structural support of the rain apron.

Once completed, the front beam becomes one of the most heavily loaded structural members of the entire roof system because it supports both lighting equipment and the primary Stage Sound system.

Phase 12 — Install the LED Frames

The aluminium LED support frames positioned outside the main roof are assembled while the roof structure remains close to ground level.

Installing these frames early allows the large LED screens to be integrated more efficiently during later construction without requiring excessive high-altitude work.

The LED support frames are installed independently from the roof membrane so that screen maintenance and replacement can be carried out without affecting the primary roof structure.

Phase 13 — Lift the Entire Roof Progressively

This is perhaps the most distinctive stage of the entire construction process.

The roof is not lifted to its final height in one continuous operation.

Instead, the process follows a repeating sequence:

Lift the roof

↓

Install additional column sections

↓

Lift again

↓

Install more column sections

↓

Continue until the required height is reached

Using this progressive method, the entire roof structure eventually reaches an elevation of approximately 20 metres.

Because the lifting cylinders remain at the base, the roof can be raised safely while maintaining good control over the structure throughout the operation.

Phase 14 — Suspend the Main Line Array Systems

Once the roof reaches its design elevation, the main line array loudspeakers are suspended from the front beam beneath the rain apron.

Their final position provides the required height and projection angle for the primary audience coverage while keeping the loudspeakers protected beneath the roof overhang.

These loudspeakers form only the first layer of the overall stadium sound reinforcement system. Additional delay speakers and relay speaker towers work together to provide consistent coverage throughout the venue, as explained in How Is a Stadium Concert Sound System Distributed? and Why Are Relay Speaker Towers Needed?.

Construction Is About Sequence, Not Speed

To spectators, a concert stage appears to rise remarkably quickly.

However, speed is only possible because every phase has been carefully planned.

The centre line must be established before columns are positioned.

Columns must be completed before the roof can be assembled.

Rigging equipment is installed before lifting.

The roof membrane is completed before elevation.

The roof is lifted progressively rather than all at once.

Each phase prepares the next.

The result is a temporary structure capable of safely supporting lighting, LED screens, sound systems and thousands of kilograms of suspended production equipment within only a few days.

Although spectators usually notice only the completed stage, every component has already been coordinated with the venue layout, sound system and production workflow. The relationship between these systems is explored further in Why Is the FOH Positioned in the Middle of the Audience Area?.

Looking Ahead in This Series

This article has focused exclusively on the hydraulic roof stage.

Other important systems observed during this project will be analysed separately, including:

• The Ringlock structures supporting the stage wings, LED systems and backstage facilities.

• The walkway stage and circular B-stage that extend the performance into the audience.

• The ground protection system used to safeguard the stadium running track during construction.

• The backstage tents, performer circulation routes and temporary production compound.

If you would like to understand how these individual systems work together, you can continue with the following engineering articles:

• Why Are Large Concert Stages Built Inside Stadiums?

• Understanding the Layout of a Large Stadium Concert

• Why Is the FOH Positioned in the Middle of the Audience Area?

• Why Are Relay Speaker Towers Needed?

Together, these articles explain not only how a concert stage is built, but also why every structural and production system is positioned where it is.