Aluminum Cladding vs Composite Cladding : A Complete Comparison Guide

In modern building curtain wall, exterior wall decoration and facade renovation projects, aluminum cladding and composite cladding are two of the most widely used and most concerned decorative enclosure materials. They are similar in appearance, but there are significant differences in material structure, mechanical properties, fire safety, service life, cost and applicable scenarios.

In order to help you choose accurately, avoid engineering risks and control project costs, this article will provide a full range of in-depth comparison between aluminum cladding and composite cladding from the dimensions of material definition, process structure, etc. to provide professional selection reference for various types of architectural façade projects.

What Is Aluminum Cladding?

Aluminum cladding is an integral curtain wall panel made of solid aluminum alloy thick plate, with a conventional thickness of 2mm-6mm, and can be customized with thicker specifications according to project requirements.

The panel as a whole is a single homogeneous aluminum alloy material, no interlayer, no composite core material, through precision machining and molding, as a rainproof curtain wall, facade enclosure system installation, not only to protect the main structure of the building, but also to shape a smooth and sharp, texture advanced modern building facade.

With the ultimate structural stability, impact resistance and long service life, aluminum cladding is mostly used in high-end buildings, high-rise buildings and public infrastructure projects with high requirements for durability, fire safety and façade texture, focusing on solid texture and long-term stable service performance.

Material Composition and Production Process

Material Composition

Aluminum cladding core is made of 3xxx, 5xxx, 6xxx series high-strength aluminum alloys, which combine strength, formability, corrosion resistance, and weldability, and are suitable for all kinds of harsh outdoor environments.

The surface of the plate is equipped with high-end durable coating as standard, with 70% PVDF fluorocarbon coating as the main coating, and anodic oxidation and powder coating can also be used to effectively resist ultraviolet aging, rain erosion, sand abrasion, and to achieve long-term color preservation and gloss effect.

Production Process

The whole process of aluminum cladding is integrated, precise and stable:

Firstly, the aluminum ingot is melted, alloy proportioning and casting into aluminum billet, then processed to the precise thickness by hot rolling and cold rolling; then it is annealed and tempered to optimize the mechanical properties;

Subsequently, the surface coating treatment is completed, and finally, through CNC cutting, grooving and folding, bending and curvature, punching and embossing, and other precision processing, all kinds of shaped panels are customized to match with the special installation accessories, which are suitable for the installation standard of the ventilation curtain wall system.

The whole set of process has very small tolerance and even surface texture, which fully meets the stringent standards of high-end architectural curtain wall.

Performance Characteristics

Outstanding overall rigidity: solid homogeneous structure, plate thickness is sufficient, stiffness, deformation resistance, resistance to depression far beyond the composite panels, support in place under the premise of the board surface flatness is extremely high, not easy to appear board surface ripples, bulging, oil surface ripples, the facade regularity is stable for a long time.

Class A1 ultimate fire protection: pure aluminum material itself is non-combustible, non-combustible, without any combustible additives, can easily reach EN 13501-1 Class A1, ASTM E84 Class A highest fire rating, only melting at 660 ℃ high temperature does not burn, does not release toxic fumes, perfectly adapted to high-rise buildings, crowded places of the fire code.

Strong structural stability: the overall homogeneous structure without delamination potential, uniform force, excellent resistance to environmental stress, wind pressure, anti-fatigue performance, can meet the needs of large-span curtain wall, high altitude, strong wind region of the project, and can be 100% recycled, green and environmentally friendly.

What Is Composite Cladding?

Composite cladding, i.e. aluminum composite panel cladding, adopts the classic sandwich structure, consisting of the upper and lower layers of thin aluminum skin and the middle core material composite, which is a lightweight, cost-effective building façade decoration materials.

The thickness of the surface aluminum alloy sheet is only 0.2mm-0.5mm, with different functions of the intermediate core material, taking into account the weather resistance and aesthetics of aluminum and the core material’s lightweight, easy to form the advantages of the overall weight is much lower than the same specifications of the solid aluminum cladding, handling, processing, installation of lower difficulty, and the panel surface flatness is excellent, design plasticity is very strong.

With high cost performance and rich decorative effects, composite cladding is widely used in commercial facades, store signboards, interior decoration, low-rise building curtain walls and other scenarios, and is the preferred material for budget-controlled projects in pursuit of quick landing.

Material Composition

Double-layer aluminum surface layer: upper and lower two layers of ultra-thin aluminum alloy coil, the surface of PVDF fluorocarbon, polyester spraying and other processes, with good weather resistance, anticorrosion, anti-ultraviolet performance, to ensure the basic decorative effect of the façade and the ability to protect.

PE polyethylene ordinary core material: the core material of conventional civil composite panels, with light texture, good flexibility and high cost performance, suitable for indoor decoration, low-risk scenarios such as low-rise facades and temporary buildings.

FR flame retardant mineral core material: high-end fireproof composite panel core material, adding aluminum hydroxide, magnesium hydroxide and other inorganic flame retardant fillers, flame retardant smoke suppression, reduce the risk of combustion, to meet the basic fire protection requirements of high-rise buildings, public buildings, is the mainstream of the outdoor facade selection.

Sheet through high temperature and high pressure continuous laminating process composite molding, aluminum skin and core material combined closely, strong integrity, avoiding the traditional glue bonding easy delamination problems, structural stability is greatly improved.

Production Process and Structural Characteristics

Production Process

Firstly, the aluminum coil is uncoiled, cleaned and pre-treated to remove surface impurities and improve adhesion; then the core material is extruded or shaped;

Then through high-temperature and high-pressure composite equipment, the double-layer aluminum skin is permanently attached to the core material, and finally the film is laminated for protection, cut and shaped, and quality inspected at the factory. The whole set of processes has a high degree of automation, and the flatness and consistency of the panels are excellent.

Structure Characteristics

Light weight and high strength: the sandwich structure realizes high rigidity by light weight, and the self-weight under the same flatness is much lower than that of solid aluminum panels, which greatly reduces the building load;

Dimensional stability: the panel surface is not easy to warp and deform, and can still maintain the ultimate flatness when laid over a large area;

Acoustic and thermal insulation: the core material has its own thermal and acoustic insulation properties, which can help reduce building energy consumption and optimize the indoor acoustic environment;

Strong plasticity: V-groove, bending, curvature processing, punching and carving, suitable for all kinds of complex shape design.

Aluminum Cladding vs Composite Cladding

Structural Strength

Aluminum cladding is solid homogeneous thick plate structure, the overall rigidity, resistance to bending, deformation resistance ability to pull full, 3-6mm conventional thickness can be adapted to large span curtain wall, strong wind pressure area, long-term use without deformation, no relaxation, high-rise building service stability is very strong.

Composite cladding relies on the sandwich structure to achieve stiffness, lightweight advantages, but the overall toughness is greater than the rigidity, extreme wind pressure, external impact, if the support structure is not in place, easy to appear concave, plate surface corrugation, local deformation problems, long-term high-intensity working conditions, the stability of weaker than solid aluminum cladding.

Fire Safety

Fire safety is the core difference between the two types of materials. Aluminum cladding is pure metal material, natural non-combustible, without any combustible components, stable to A1 level non-combustible standards, does not promote combustion, does not spread, and does not release toxic fumes in a fire, which is the preferred choice for compliance in high-rise buildings, public buildings, and densely populated places, and is fully adapted to the stringent new fire regulations.

The fireproof performance of composite cladding is completely dependent on the core material. Ordinary PE core material is combustible, easy to melt and smoke at high temperature, and is only suitable for indoor and low-rise scenarios;

FR flame-retardant mineral core material can improve the fire protection level, but still can not reach the pure aluminum A1 standard, high-risk buildings, ultra-high-rise buildings application of compliance risk. Nowadays, most cities’ new high-rise and public buildings have clearly prioritized the use of non-combustible solid aluminum cladding.

Weather Resistance and Service Life

High-quality aluminum cladding with PVDF fluorocarbon coating can withstand extreme temperature differences, strong ultraviolet rays, salt spray corrosion, wind and rain wash, outdoor service life of up to 50 years or more, long-term use of only a slight coating aging, no structural damage, no risk of delamination.

High-end FR flame retardant composite cladding service life of up to 30-50 years, the conventional PE core material sheet only 20-30 years. In the coastal high salt fog, plateau strong ultraviolet ray, high temperature and high humidity and other harsh environments, composite plate edge easy to seepage, core material is easy to aging, easy to delamination of the aluminum skin, aging speed is obviously faster, the probability of maintenance and replacement of the later period is higher.

Thermal Insulation

Composite cladding has natural heat preservation advantages, sandwich core material can effectively block heat transfer, reduce the efficiency of cold and heat exchange in the building, reduce air conditioning, heating energy consumption, without additional insulation layer can realize the basic energy saving effect.

Aluminum cladding is made of pure metal, with high thermal conductivity, fast heat transfer, and weak heat preservation and insulation performance. If it is necessary to achieve the same energy-saving standard, it needs to be combined with external wall insulation layer and heat-insulating gaskets to assist in the construction, which will increase the supporting processes and costs.

Impact Resistance

Solid aluminum cladding has greater self-weight, stronger rigidity, excellent impact resistance, wind pressure resistance and fatigue resistance, which can comfortably cope with extreme working conditions such as coastal typhoons, strong winds on plateaus and impacts of falling objects at high altitude, and has no deformation or breakage in long-term service.

Composite cladding is light in weight and stable under regular wind pressure conditions, but it is easy to be dented and deformed under extreme strong wind and high intensity external impacts, and high altitude and coastal strong wind areas require thickened plates and encrypted support structures, so the comprehensive adaptability is far inferior to aluminum cladding.

Aesthetic & Design Flexibility Comparison

Surface Technology and Color Diversity

Aluminum cladding supports fluorocarbon spraying, powder coating, anodic oxidation, brushed, hammered, imitation wood grain, imitation stone grain and other types of surface technology, both sides can be high-end painting, color uniformity and fullness, metal texture, high level of color mixing precision, matte, high gloss, satin and other textures can be customized, long-term color retention is excellent, suitable for high-end landmark buildings, government and enterprise infrastructure projects.

Composite coating color style is more rich, pearl, metal, matte, high-definition printing wood grain/stone grain/abstract pattern can be achieved, coil coating process makes the whole board color uniformity without color difference, large quantities of customized cost-effective, suitable for commercial stores, Netflix building, decorative modeling and other scenes with high requirements for style diversity.

Modeling Processing Capability

Aluminum cladding can be cut by CNC precision, grooving, bending, large arc bending, punching and carving, to create complex shaped facade, three-dimensional modeling, fine closing lines, the edge of the regular, three-dimensional sense of strong, to meet the needs of high-end architectural personalization, customized design, the only shortcoming is the difficulty of large-arc modeling processing, the cost is slightly higher.

Composite cladding texture is light, better toughness, bending, curvature processing without rebound, V-type slotting can be realized at right angles to the splicing, easy to create a large flat facade, smooth curved surfaces, exquisite box modeling, complex planar modeling to land with lower difficulty and higher efficiency.

Flatness and Long-Term Value Maintenance

High-quality aluminum cladding with reinforced support structure, flat surface, heavy texture and high-level, integral structure without the risk of delamination, minor scratches can be polished and repaired, and after decades of use, it is still flat and beautiful, with no fading, no peeling and no ripples.

Composite cladding comes with sandwich stable structure, the flatness of large area board is better than ordinary aluminum, seamless splicing effect is extremely simple, but the surface layer of aluminum skin is thinner, deep scratches, edge damage can not be repaired, fading, delamination, warping prone to extreme environments, long-term value of stability is weaker than the aluminum cladding.

Cost Comparison

Initial Project Cost

Aluminum cladding: higher initial investment. Solid thick plate raw material cost is high, processing technology is complicated, plate weight is bigger, transportation, lifting, labor cost increases accordingly, and need more stable steel frame support structure, the overall initial cost is 20%-50% higher than the composite cladding, suitable for budget, the pursuit of long-term quality of the project.

Composite cladding: outstanding cost performance in the early stage. Lightweight panels, inexpensive raw materials, simple processing, transportation, handling, installation efficiency is very high, without complex support structure, labor costs are greatly reduced, is the first choice of the limited budget, short-term landing projects.

Long-Term Operation and Maintenance and Replacement Costs

Aluminum cladding: very low life cycle cost. Only 1-2 times of regular water cleaning is needed throughout the year, without frequent maintenance; 50 years of long service life is almost no need to replace the whole, no delamination, aging hidden danger, naturally in line with all kinds of new fire regulations, no need for later transformation and upgrading, and no hidden operation and maintenance costs.

Composite cladding: High-end FR sheet O&M pressure is small, but the conventional sheet needs to regularly check the edges, sealing parts, to prevent water seepage delamination; PE core sheet life is short, 15-25 years prone to aging, discoloration, delamination problems, need to be replaced as a whole;

After the fire policy is updated, some of the old composite panel facades need to be remodeled and upgraded, resulting in additional remodeling, insurance, operation and maintenance costs.

Maintenance & Lifespan Performance

Difficulty of Daily Maintenance

Aluminum cladding has strong dirt resistance, dense and smooth surface, dust, stains are not easy to adhere to, daily only need water with neutral detergent can be cleaned and renovated, maintenance is simple, low cost, minor scratches can be partially polished repair, no need to replace the board.

Composite cladding is also easy to clean, but the surface layer of aluminum skin is thin, prohibit the use of strong corrosive cleaners, and need to regularly check the board seams, edge sealing, to prevent rainwater infiltration triggered by delamination, the maintenance of more sophisticated requirements.

Failure Risk and Service Life Measurement

The core failure of composite cladding is delamination of aluminum skin and core material, aging of core material, edge breakage, warping of board surface, coastal, high temperature, high UV environment failure probability is greatly increased, the life of conventional PE boards is 10-25 years, and the life of high-end FR boards is 30-40 years.

Aluminum cladding has no structural defects of delamination, very low risk of failure, only long-term natural aging of the coating, the industry’s measured service life is generally up to 40-50 years, still stable and durable in harsh environments.

Repair and Restoration Effect

Aluminum cladding local damage, scratches can be accurately repaired, polished and renovated, after repair and the original board surface without obvious color difference, no traces, the overall unity of the façade is very strong; composite cladding, once there is a deep layer of damage, delamination, core material exposure, can not be partially repaired, you have to replace the whole single plate, easy to appear in the old and the new board surface color difference problems.

Comparison of Installation and Construction Differences

Installation Characteristics of Aluminum Cladding

Aluminum cladding has a large self-weight and strong rigidity, which requires a higher load bearing capacity for the base support frame and steel frame, and requires accurate wind pressure load measurement in advance to customize a solid aluminum/steel support structure.

The construction mostly adopts hidden and exposed mechanical fixing process with ventilated curtain wall system, reserving ventilated cavity behind the panel to realize drainage, ventilation and heat insulation effect. The overall construction requires high precision and complex processes, and needs the assistance of professional craftsmen and heavy equipment, which makes the construction cycle longer, but the structure is solid, deformation-resistant and highly durable after completion.

Composite Cladding Installation Characteristics

Composite cladding is lightweight, easy to handle, easy to cut, and highly adaptable to construction, supporting a variety of processes such as structural adhesive bonding, mechanical fixing, and snap-type box installation. Box-type installation can realize rapid assembly and seamless molding, and single plates can be disassembled and replaced independently, making later maintenance more convenient.

The overall construction difficulty is low, the labor cost is low, and the construction speed is 30%-50% faster than aluminum cladding, which is suitable for commercial projects in a hurry.

How to Choose Between Aluminum Cladding and Composite Cladding

Project Type

High-rise and public buildings: aluminum cladding is preferred. These buildings are densely populated and subject to strict fire control. Aluminum cladding’s A1 non-combustible properties, superior durability and low O&M characteristics can fully meet the high standard of safety service requirements.

Industrial buildings: aluminum cladding is preferred. Relying on excellent corrosion resistance, impact resistance, high and low temperature resistance, it can be adapted to harsh working conditions such as chemical industry, heavy load, dust, etc., with stable long-term service and convenient maintenance.

Civil lightweight scenes: preferred composite cladding. With the advantages of high cost-effectiveness, rich color and shape, and efficient construction, it is perfectly suited to regular decorative needs, and the landing effect is fashionable and beautiful.

Budget and Service Cycle

Short-term projects, limited budget, tight schedule: choose composite cladding. Lower cost of materials, transportation and labor in the first stage, fast construction speed, can meet the short-term service demand of 15-20 years, the best cost performance.

Long-term permanent building, the pursuit of comprehensive cost-effective: choose aluminum cladding. Although the initial investment is high, but by virtue of 50 years of long service life, zero frequent maintenance, no transformation of the hidden danger, significantly reduce the whole life cycle costs, asset preservation is stronger.

Climate and Working Conditions

Severe climate: priority aluminum cladding. Outstanding resistance to wind pressure, salt spray corrosion and aging, it can withstand extreme weather erosion and avoid deformation, color fading and delamination of the façade.

Inland mild climate, regular working conditions: both materials can be adapted. Can be combined with the project budget, decorative modeling needs flexible choice, can ensure stable service effect.

Fire Code

Fire compliance level: High-rise, large public and crowded buildings, strictly prioritize A1 grade non-combustible aluminum cladding, which fully meets the current new fire regulations;

For low-rise, indoor non-core areas, FR flame-retardant composite cladding can be used, and the use of flammable PE core composite panels is strictly prohibited to avoid potential safety hazards.

Operation and Maintenance Requirements

Operation and maintenance management: high-end projects pursuing long-term maintenance-free, zero-change panels and long-term uniformity of façade are preferred to aluminum cladding; projects accepting annual routine inspections, recognizing phased maintenance and focusing on initial cost control are suitable for composite cladding.

Which Industries Prefer Each Material?

Preferred Industry Scenarios for Aluminum Cladding

Applicable scenes: airports, transportation hubs, hospitals, schools, government buildings, high-end office buildings, large commercial complexes, industrial plants and other public and key projects.

These buildings are generally characterized by high density of people, strict fire safety standards, high frequency of use and long service life. Aluminum cladding is the mainstream material of choice for such key projects due to its core advantages of A1 non-combustible safety, super impact resistance, extremely low operation and maintenance costs, easy cleaning, and long service life, which perfectly matches the requirements of high safety, high durability, and high standards.

Industry Scenarios Prioritizing Composite Cladding

Applicable scenarios: residential facades, commercial stores, net red showrooms, low-rise hotels, commercial street remodeling, indoor ceiling and wall decorations and other civil and light commercial projects.

This kind of scenario pays more attention to the decorative effect, construction efficiency and cost control, without extreme wind pressure, fire and other high load conditions. With light weight, flat surface, rich color and shape, fast installation and outstanding cost performance, composite cladding can efficiently create simple and personalized modern decorative façade, which is fully suitable for the core needs of civil decoration projects.

Conclusion

Aluminum cladding and composite cladding have no absolute advantages and disadvantages, but only different adaptable scenes. Simply put: in pursuit of safety, durability, long-term value and high-end quality, choose solid aluminum cladding; in pursuit of cost-effective, high value, fast construction and short-term landing, choose composite cladding.

When selecting materials for a project, do not simply compare prices or follow the trend of selection, but combine with the building height, fire code, climate conditions, budget, service cycle, operation and maintenance needs to make a comprehensive judgment, in order to select the most cost-effective, the lowest risk, and the best adaptability of the facade cladding materials.