What Is Aluminum Cladding? Everything You Need To Know

In the field of facade decoration and enclosure structure of modern buildings, aluminum cladding has become the mainstream building material for commercial buildings, residential buildings and public infrastructure reconstruction by virtue of its core advantages of light weight, high weather resistance, high beauty value and long service life.

Many construction practitioners, engineering procurement, decoration designers in the selection of materials, will focus on the performance of aluminum cladding, type, installation and maintenance knowledge.

This article will comprehensively explain what aluminum cladding is, working principle, classification, advantages, application scenarios, material selection skills, construction process and solutions to common problems, helping you understand the core knowledge of aluminum cladding in one stop.

What Is Aluminum Cladding?

Aluminum cladding is a kind of non-structural metal enclosure decoration layer fixed on the surface of external wall and internal wall of building. It is mainly composed of aluminum plate, aluminum coil or aluminum composite profile. It does not bear the bearing role of building main body. Its core role is to protect building matrix, optimize building appearance and improve building energy saving performance.

The common aluminum cladding forms on the market include solid aluminum veneer, aluminum-plastic composite board, aluminum hanging board, ventilation rain curtain wall system, etc., which are widely suitable for various scenes such as new buildings, renovation of old buildings, indoor high-end decoration, etc.

A complete high-performance aluminum cladding system is not a single sheet, but a multi-layer integrated structure with the following core components:

Aluminum panel: the outermost visual structure, including solid aluminum plate, composite plate, honeycomb plate, etc., plays the core role of wind and rain resistance, impact resistance and beautiful decoration, and can be customized in thickness, color and texture, and can be recycled.

Supporting framework: mostly aluminum alloy or galvanized steel keel, bracket and bracket system, which is responsible for fixing the panel on the building wall, reserving ventilation cavity and bearing wind pressure, dead weight and other loads.

Heat preservation and insulation layer: it is laid on the inner side of cladding cavity or wall base layer to effectively reduce the cold and heat loss of the building and improve the sound insulation and noise reduction effect at the same time, which is the core configuration of energy-saving building.

Fastening accessories: including buckles, screws, rivets and hidden fasteners, which can firmly fix the panel, and adapt to the thermal expansion and contraction characteristics of aluminum, which is convenient for later installation and maintenance.

Ventilation cavity: rain curtain system exclusive structure, 20-50mm air layer reserved between the panel and the wall to realize drainage, ventilation and dehumidification functions, and prevent the wall from being affected with damp and mildew.

How Aluminum Cladding Works

Aluminum cladding is the essence of multi-storey integrated building envelope system, the mainstream USES the ventilation rain curtain wall structure, through the collaborative work of various parts, realize the building protection, energy saving, beautiful three core values, the specific working mechanism is divided into four dimensions:

Resist Climate Erosion

The aluminum panel surface is dense and non-porous, which is the first protective barrier of the building, which can effectively resist the invasion of natural factors such as rain, strong wind, snow, hail, ultraviolet ray, etc.

After fluorocarbon, powder, anodic oxidation treatment of aluminum, not easy to fade, deformation, corrosion, can protect the wall at the grass-roots level for a long time, to avoid wall cracking, water seepage, weathering and peeling.

The rain curtain structure can actively dredge wind and rain, and prevent rainwater from permeating into the wall body.

Optimize Thermal Insulation Performance

Aluminum cladding can be perfectly matched with various insulation materials. Through the continuous insulation design of external wall, the thermal bridge effect of the building is greatly reduced, and the heat transfer between indoor and outdoor is reduced.

At the same time, the air convection effect of the ventilation cavity can automatically adjust the temperature difference between the inside and the outside of the curtain wall, block the outdoor heat wave in summer and lock the indoor temperature in winter, effectively reduce the energy consumption of building air conditioning and heating, and improve the overall energy saving rate of the building.

Control Wall Moisture

Moisture and water resistance is one of the core advantages of aluminum cladding.

A small amount of water vapor seeping into the panel gap can be quickly dried and discharged through the ventilation cavity, and the secondary protection of the waterproof breathable film on the inner side is matched to completely eliminate the accumulation of water vapor.

At the same time, the aluminum material has a natural oxidation protective layer, which will not rust and rot, and avoid the problems such as mildew of the wall, aging of the wall structure, falling off of the base layer and the like from the root.

Pluralistic Architectural Aesthetic

The aluminum cladding has strong plasticity, which can be processed into various shapes such as flat plate, arc, perforation and corrugation.

With customized finishes such as wood grain, stone grain, matte, bright surface and metal drawing, it can not only create simple and modern business architectural style, but also reproduce natural wood texture, adapt to various architectural design requirements, and greatly improve the architectural beauty and commercial value.

Types of Aluminum Cladding

According to the structure, process and use scenario, aluminum cladding can be divided into five mainstream categories, with significant differences in performance, cost and adaptation scenarios of different types, which is the core basis for material selection:

Aluminum Composite Panel Cladding

It is composed of upper and lower thin aluminum plates + middle polyethylene or fireproof mineral core material, with overall thickness of 3-6mm and fluorocarbon or polyester coating on the surface. It is a universal coating material with high cost performance.

Core advantages: light weight, strong rigidity, high flatness, good heat insulation and sound insulation effect, rich colors and styles, low construction cost in large area, and convenient processing and installation.

Application scenarios: office buildings, shopping malls, airports, high-rise exterior walls, outdoor signs, indoor partitions, fire rating plate can be used for high-rise building projects.

Solid Aluminum Panel Cladding

It is made of 2-5mm thick single-layer aluminum plate, which is formed by bending, sheet metal and buckle. It has no composite core material, can be anodized, powder sprayed and fluorocarbon sprayed, and supports special-shaped customization.

Core advantages: impact resistance, strong weather resistance, A1/A2 grade non-combustible, 100% recyclable, fear of bad weather, long service life and low maintenance cost.

Applicable scenarios: schools, hospitals, public venues, industrial plants, coastal areas with high corrosion, and construction projects with strict fire protection requirements.

Perforated Aluminum Cladding

Precision stamping of various holes and artistic patterns on the surface of aluminum veneer gives consideration to both decoration and practicality, and is a common material for net-red buildings and landscape curtain walls.

Core advantages: unique lighting effect, good ventilation and heat dissipation, sunshade and heat insulation, reduce heat accumulation inside the curtain wall, give consideration to lighting and privacy, and customize enterprise LOGO and artistic texture.

Applicable scene: building sun-facing facade, parking lot facade, exhibition hall, commercial complex art curtain wall, interior modeling wall.

Aluminum Honeycomb Panels

The upper and lower aluminum panels + hexagonal aluminum honeycomb core are compounded, with a thickness of 6-50 mm. The overall thickness is light and thin, and the flatness and rigidity are far superior to those of ordinary aluminum plates. The wind pressure resistance and deformation resistance are excellent.

Core advantages: ultra-light, high-strength, excellent flatness, span bearing capacity, not easy to deformation, sound insulation and heat insulation performance of the top.

Application scenarios: airport terminal, gymnasium, landmark buildings, large-area curtain wall, high-end exhibition hall and other high-standard construction projects.

Timber-Look Aluminum Cladding

Through thermal transfer printing, laminating and spraying processes, the natural wood grain textures such as oak, fir and walnut are reproduced on the surface of the aluminum material, which perfectly replaces the solid wood exterior wall.

Core advantages: with natural texture of solid wood, at the same time put an end to solid wood decay, cracking, moth eaten, fading problems, fire and moisture, weather resistance and durability, without frequent maintenance.

Application scenarios: villas, residential accommodation, hotels, garden buildings, coastal high humidity area building facade, balcony, ceiling.

Key Benefits of Aluminum Cladding

Lightweight Yet Strong

The density of aluminum is much lower than that of traditional exterior wall materials such as stone, brick and concrete, and its weight is only about 1/3 of that of stone. It is convenient to transport and has high field construction efficiency.

At the same time, the lightweight characteristics will not cause additional loads on the main body of the building and the foundation, adapt to the renovation of old buildings, high-rise buildings, and load-limited buildings, and have strong structural stability and can withstand strong wind pressure.

Excellent Corrosion Resistance

Aluminum surface can naturally form a dense oxidation protective film, with fluorocarbon, anodizing and other high-end coatings, can resist sea breeze salt fog, humidity, acid rain, ultraviolet corrosion, especially suitable for coastal, industrial pollution, high humidity areas.

The high-quality aluminum coating can be used normally for more than 50 years, with almost no aging and damage problems.

Fire Safety

Aluminum cladding has excellent fire and flame retardant properties, and the safety factor is far superior to most exterior wall materials.

Among them, pure aluminum veneer and aluminum honeycomb plate belong to Class A non-combustible materials, which can reach the highest fire prevention level of A1. In case of high temperature, they do not burn, do not support combustion, and do not spread open fire.

Flame retardant aluminum-plastic composite panels through professional fire modification treatment, fully meet the fire acceptance standards for high-rise buildings.

The overall combustion process will not release toxic and harmful smoke, smokeless and non-toxic, stable flame retardant, which can perfectly adapt to the strict fire prevention specifications of various public buildings and high-rise buildings such as schools, hospitals, office buildings and high-rise residential buildings.

Low Maintenance

Aluminum coating surface after professional coating treatment, compact and smooth texture, dust and dirt resistance, not easy to adhere to stains and mold, with good self-cleaning performance.

Daily maintenance does not require complicated procedures, only with water and neutral detergent gently wipe, you can keep the facade clean and new.

Compared with solid wood exterior walls and latex paint walls, aluminum cladding has almost no post-renovation cost, greatly reduces the maintenance cost of the whole life cycle of the building, and has outstanding cost-performance advantages for long-term use.

Design Flexibility

Aluminum cladding has strong modeling and finishing plasticity, and the design freedom is extremely high, which can fully meet the diversified aesthetic design requirements of modern buildings.

Color support full-color accurate customization, finishing technology covers matte, bright surface, metal wire drawing, matte, wood grain, stone grain and other textures, highly restore various high-end decoration effects.

At the same time, the plate can be bent, punched, curved, CNC shaped processing and other processes to create a simple plane, artistic surface, hollowed-out modeling and other diversified facade forms, helping architects to create a unified style, high-quality texture, strong recognition of the exclusive building facade.

Sustainability

Aluminum is recognized as a green low-carbon environmentally friendly building material with excellent sustainable use value.

The aluminum coating can realize 100% infinite recycling, no material loss in the recycling process, and the recycling energy consumption is only 5% of the original aluminum production, greatly reducing energy consumption and carbon emissions.

No harmful substances are released during the production, construction and use stages of the product, and no construction waste and environmental pollution will be generated.

At the same time, its excellent thermal insulation and energy-saving characteristics can effectively reduce building energy consumption, assist engineering projects to successfully apply for LEED, BREEAM and other international green building certifications, and highly conform to the current industry development trend of low-carbon buildings and green construction.

Aluminum Cladding vs Other Cladding Materials

Aluminum vs Steel Cladding

Steel cladding has excellent mechanical strength and strong load-bearing capacity, but its own weight is large, which will increase the load of the building structure and the cost of transportation and on-site construction is higher.

At the same time, the rust resistance of steel is weak. Even if galvanized and painted, it is still easy to rust and age in coastal salt fog, humidity and industrial corrosion environment. It needs regular rust removal and renovation, and the long-term maintenance cost remains high.

On the other hand, aluminum cladding has a weight of only 1/3 of steel, which is convenient to construct and has no additional structural burden.

Relying on natural oxide layer + professional coating, it has excellent corrosion resistance, adapts to most complex outdoor scenes, almost does not need frequent maintenance, and the comprehensive cost performance of the whole life cycle is far superior to steel. Only heavy industrial load-bearing structure scenes are more suitable for steel selection.

Aluminum vs Wood Cladding

Solid wood coating texture is warm and natural, texture is original ecology, adapt to natural wind architectural design, but natural wood stability is very poor, long-term exposure to outdoor susceptible to temperature and humidity, pests, ultraviolet rays, cracking, deformation, mildew, decay and other problems, usually 2-3 years need polishing, painting, anti-corrosion maintenance, conventional service life is only 20-40 years.

The wood grain aluminum cladding layer is 1:1 engraved with solid wood texture and texture through high-precision technology, perfectly retaining the aesthetic advantages of logs, and completely solving the pain points of fragile and difficult maintenance of solid wood. It has the characteristics of fire prevention, moisture resistance, insect resistance and aging resistance. The service life can reach more than 50 years. It is a high-quality long-term alternative to outdoor wooden exterior walls.

Aluminum vs Vinyl Cladding

The biggest advantage of PVC ethylene coating is that the initial cost is low, but the comprehensive performance is short, and the adaptation scene is very limited.

PVC material high temperature resistance, poor impact resistance, low temperature environment easy brittle crack, aging, high temperature exposure easy deformation and softening, and belongs to combustible materials, combustion will release toxic and harmful gases, fire safety hazards, outdoor service life is short.

Aluminum cladding is non-combustible metal material, with strong structural stability, resistance to strong wind, hail, temperature difference impact, weather resistance, safety, structural strength leading, suitable for commercial, residential, public infrastructure and other high-standard building projects, is a high-quality material that gives consideration to safety, beauty and durability.

How to Choose the Right Aluminum Cladding

Building Types

For residential projects, wood grain imitation and pure color powder coated aluminum veneer are preferred, giving consideration to color value and cost performance; for commercial high-end projects, fluorocarbon coated aluminum veneer and aluminum honeycomb board are preferred to ensure uniform color and weather resistance in large areas;

Industrial buildings give priority to thick solid aluminum veneer, focusing on impact resistance and corrosion prevention; high-rise buildings must use compliant fire rating cladding materials.

Use Environment

Marine grade aluminum + high weather resistant fluorocarbon coating shall be selected in coastal areas to resist salt fog corrosion; rain curtain ventilation structure shall be optimized in high temperature and high humidity areas to strengthen moisture-proof drainage;

In areas with large temperature difference, plate structure suitable for thermal expansion and contraction shall be selected, and expansion gaps shall be reserved to avoid plate deformation and arching.

Surface Technics

High-end landmarks, street buildings choose fluorocarbon coating, 20-30 years do not fade; conventional commercial, residential projects choose powder coating, high cost performance, weather resistance standards;

Anodic oxidation is selected for industrial and high-collision scenes to resist scratching and wear; wood grain transfer is selected for landscape and residential projects to restore natural texture.

Thickness of Wood Plates

3-4mm for conventional ACP aluminum-plastic plate; 2-3mm for solid aluminum plate for residential external wall; 4-5mm thick aluminum plate for high-rise and high-wind pressure areas;

Aluminum honeycomb panels of more than 6mm are used for large-area curtain walls and high-end projects to ensure flatness and structural stability.

Budget

Short-term low-cost requirements optional conventional aluminum-plastic plate, powder coating plate;

For long-term self-sustaining and high-end projects, it is recommended to select fluorocarbon solid aluminum plates and honeycomb plates. Although the initial cost is high, the ultra-low maintenance cost and long service life can greatly reduce the full-cycle investment and the comprehensive value is higher.

Installation Process of Aluminum Cladding

Standard installation is the core guarantee of aluminum cladding performance and service life. The standard construction process is divided into five steps:

Preliminary Site Base Treatment

Before formal construction, complete the overall acceptance and pretreatment of the base.First check the flatness, firmness and integrity of the base surface of the wall, repair and level the hollowing, cracking and falling parts to ensure that the base surface meets the hanging force standard.

Then, waterproof permeable membrane and water-stopping barrier are laid on the outside of the wall to construct a continuous secondary waterproof system to block the hidden seepage channel.

Finally, accurately set out and position in combination with construction drawings, plan plate layout modulus, temperature expansion joints, doors and windows and equipment opening nodes in advance, avoid installation deviation from the source, and ensure subsequent construction accuracy.

Install Support Keel Frame

Install aluminum alloy or galvanized steel keel, special support and bracket according to design elevation and positioning line, and adjust the whole process to ensure that the overall skeleton is flat and firm and the force is uniform.

In strict accordance with the rain curtain system standard, a 20 – 50mm transparent ventilation cavity is reserved to ensure the later drainage, air drying and thermal insulation ventilation effects.

According to the energy-saving design requirements, the insulation board is embedded to ensure that the insulation layer has no continuous break point and no vacancy. At the same time, the insulation block and insulation isolation piece are installed to effectively weaken the thermal bridge effect and improve the overall insulation and energy-saving performance of the building.

Aluminum Panel Fixed Mounting

Aluminum panels follow a standardized mounting sequence from bottom to top, from datum to both sides.

According to the characteristics of aluminum veneer, composite board, honeycomb board and other different plates, matching hidden buckle, fixed screw, card groove type and other suitable fixing technology, giving consideration to firmness and facade aesthetics.

Standard expansion gaps shall be reserved strictly during construction to adapt to the physical characteristics of aluminum thermal expansion and contraction, so as to prevent plate extrusion, arching, deformation and cracking. For complex nodes such as door and window corners, wall corners, opening closures, etc., customized cutting plates are used for precise closure to ensure uniform joints and smooth and uniform elevation lines.

Sealing Waterproof Closing Treatment

After the panel installation is completed, enter the systematic waterproof closing process. Weather-resistant structural sealant is filled at key nodes such as plate joint, internal and external corners, door and window intersection, through-wall opening, etc. to realize flexible sealing and seepage prevention.

Supporting installation of drip lines, flashing boards, edge closing strips, scientific diversion of rainwater flow direction, to avoid rainwater backflow, retention of wall cracks.

Keep the upper and lower ventilation cavities unobstructed and free of blockage during the whole process, ensure the normal operation of ventilation, drainage and dehumidification functions of the rain curtain system, and form a complete, stable and long-term external waterproof enclosure system.

Completion Acceptance Quality Inspection

All-round quality acceptance and performance testing shall be carried out after completion.The appearance level checks the flatness of the plate, the verticality of the elevation, the consistency of colors and the regularity of joints to ensure the overall visual effect is uniform and exquisite.

The functional layer passes the on-site water spraying test to comprehensively check the hidden dangers of water seepage and leakage and verify the waterproof performance of the curtain wall.

At the same time, check the fastening degree of the firmware, the reserved size of the expansion joint, the fire sealing and the compliance of the node structure one by one.

Keep complete construction images, acceptance records and parts warranty data, providing complete basis for later maintenance, re-inspection and project delivery.

Maintenance Tips for Aluminum Cladding

Aluminum cladding low maintenance but not zero maintenance, scientific maintenance can greatly extend the service life, keep the facade new state:

Regular Cleaning

The cleaning frequency is adjusted according to the use environment. The general urban environment can be cleaned 1-2 times a year; it is recommended to clean the coastal salt fog area and industrial dust pollution area 2-3 times a year to avoid long-term accumulation of salt and dust to corrode the coating.

Clean only with clean water and neutral mild detergent, use soft sponge, soft cloth gently wipe, prohibit strong acid and alkali reagent, hard matte tools and high-pressure water gun direct, prevent scratches, peeling surface protective layer.

Regular Inspection

It is suggested to carry out a comprehensive inspection once a year, and additional special inspection is required after rainstorm, typhoon and severe convective weather.

Focus on checking whether the panel fastening accessories are loose and falling off, whether the splicing sealant is cracked and degummed, whether the support keel is corroded, and check whether the ventilation cavity is blocked.

In case of minor hidden dangers, timely tighten, supplement glue and dredge, so as to avoid small problems evolving into structural problems such as water seepage and deformation.

Damage Repair

Follow the principle of quick repair for minor damage and replacement for serious damage. Slight scratches and paint loss on the surface can be repaired accurately with original matching color repair paint and repair pen to ensure uniform color;

In case of deep bump, depression and deformation of the plate, the whole plate shall be replaced directly to avoid affecting the flatness of the facade and structural stability;

In case of large-area powdering, fading and oxidation aging of the coating, there is no need to dismantle it as a whole. Please contact a professional team for renovation and spraying treatment to restore the overall appearance and protective performance of the facade.

Common Problems and Solutions of Aluminum Cladding

Corrugated Bulging

Causes: thin plate, installation firmware too tight, thermal stress deformation temperature difference, span too large without reinforcement;

Solution: Use thickened plates or honeycomb plates for large surfaces; reserve sufficient expansion joints for construction and prohibit excessive tightening of screws; the old deformed plate surface can be re-adjusted or the plates replaced.

Bump Damage

Cause: transportation, construction without protection, external impact in the later period;

Solution: Keep the protective film of the plate during the whole construction; repair the special paint for slight scratches; replace the obviously damaged plate directly to ensure the overall appearance of the facade.

Thermal Expansion and Contraction Lead to Cracking and Curling

Causes: no reserved expansion joints, rigid fixing methods, sealant inelasticity;

Solution: 3-5mm expansion gap is reserved strictly according to the standard, floating fixing technology is adopted, and high elastic weather resistant sealant is matched to adapt to aluminum temperature deformation.

Wall Water Seepage, Damp

Cause: Sealant shedding, drainage cavity blockage, waterproof base damage;

Solution: Regularly clean the cavity drainage channel, re-glue the damaged nodes, repair the waterproof barrier, and ensure the normal operation of the rain curtain ventilation drainage system.

Fading and Greying of Coating

Causes: poor quality coating, long-term ultraviolet exposure, pollutant accumulation corrosion;

Solution: fluorocarbon coating is preferred for outdoor high-end projects; façade contaminants are regularly cleaned; severely faded areas can be professionally refurbished and sprayed.

Conclusion

Aluminum cladding is a high-end building envelope material integrating protection, energy saving, beauty, environmental protection and durability. Compared with traditional materials such as stone, solid wood, steel and PVC, it has comprehensive advantages.

Whether it is the facade decoration of new buildings or the renovation of old buildings, the aluminum cladding system with reasonable selection, standardized construction and scientific maintenance can provide stable protection and high-end visual effects for buildings for decades, which is a high-quality choice for the facade selection of modern buildings.