Galvalume Philippines: Technical Specifications, Production Process, and Applications

Types of Galvalume Coated Steel

Galvalume coated steel is a high-performance metal product widely used across the Philippines for construction, industrial, and architectural applications. It features a unique coating composed of 55% aluminum, 43.4% zinc, and 1.6% silicon, which provides exceptional corrosion resistance—outperforming traditional galvanized steel by up to four times in many environments. This makes it ideal for the tropical climate of the Philippines, where humidity, salt air, and heavy rainfall accelerate metal degradation.

The versatility of Galvalume allows it to be manufactured into various forms, each tailored for specific construction and design needs. Below is a detailed breakdown of the most common types available in the Philippine market.

Galvalume Sheets

Flat, pre-coated steel sheets that serve as the foundational form of Galvalume. These are widely used in roofing, wall cladding, and structural components.

Advantages

• Excellent corrosion and heat resistance
• Lightweight and easy to transport
• Can be cut, bent, or formed on-site
• Cost-effective for large-area coverage

Limitations

• Requires protective handling to avoid coating damage
• Plain finish may not suit aesthetic-focused projects
• May need additional sealing at joints

Best for: Residential roofing, warehouse cladding, industrial buildings

Galvalume Coils

Continuous rolls of Galvalume steel used as raw material by manufacturers for producing custom metal products such as gutters, flashings, and HVAC ducts.

Advantages

• High production efficiency for fabricators
• Consistent coating quality and thickness
• Available in various widths and gauges
• Enables just-in-time manufacturing

Limitations

• Requires industrial cutting and forming equipment
• Not suitable for direct installation
• Bulk storage needed for large projects

Best for: Metal fabricators, industrial production, custom component manufacturing

Pre-painted Galvalume

Also known as color-coated steel, this variant features a factory-applied paint layer over the Galvalume base, combining durability with visual appeal.

Advantages

• Enhanced aesthetic options with multiple color choices
• Extra layer of protection against UV and moisture
• Low maintenance and long-lasting finish
• Ideal for visible architectural elements

Limitations

• Higher cost than standard Galvalume
• Scratches may expose underlying metal
• Color may fade slightly over time in intense sun

Best for: Building façades, commercial roofing, aesthetic roofing in homes and resorts

Galvalume Profiles

Pre-formed roofing panels with corrugated, ribbed, or standing seam designs. These are engineered for optimal water runoff and structural strength.

Advantages

• Fast and easy installation
• Superior weather resistance
• Wide range of architectural styles available
• Reduced need for overlapping sheets

Limitations

• Less flexible for custom shaping
• Requires precise measurement and cutting
• Transportation of long panels can be challenging

Best for: Residential and commercial roofing, industrial sheds, agricultural buildings

Expanded Galvalume

Created by cutting and stretching Galvalume sheets into a diamond or hexagonal mesh pattern, resulting in a strong, lightweight, and open-panel structure.

Advantages

• Allows airflow and natural light penetration
• High strength-to-weight ratio
• Excellent for ventilation and security screens
• Modern, decorative appearance

Limitations

• Not suitable for waterproofing or insulation
• Limited structural load-bearing capacity
• Edges may require finishing to prevent sharpness

Best for: Architectural grilles, balcony railings, security windows, sunshades, and decorative panels

Expert Tip: When working with Galvalume, always use compatible fasteners (such as aluminum-coated or stainless steel) to prevent galvanic corrosion. Avoid contact with untreated wood or copper, which can accelerate degradation of the coating.

In the Philippine construction industry, choosing the right type of Galvalume steel depends on factors such as climate exposure, architectural design, budget, and longevity requirements. Whether you're building a simple warehouse or a modern high-rise, Galvalume offers a durable, cost-efficient, and versatile solution that stands up to the region's demanding environmental conditions.

Key Features of Galvalume Coated Steel

Galvalume coated steel is a high-performance material widely used in construction, especially in tropical and coastal environments like the Philippines. Its unique composition—55% aluminum, 43.4% zinc, and 1.6% silicon—delivers exceptional durability, energy efficiency, and aesthetic flexibility. Below are the core features that make Galvalume a preferred choice for roofing, cladding, and structural applications in demanding climates.

Superior Corrosion Resistance

The standout feature of Galvalume steel is its advanced corrosion protection, achieved through a precisely balanced alloy coating of aluminum and zinc. The aluminum forms a protective oxide layer that shields the steel from moisture, while the zinc provides sacrificial protection at cut edges and scratches.

This dual-action mechanism makes Galvalume up to four times more resistant to rust than traditional galvanized steel, especially in humid, salty, or industrial environments. In the Philippines, where high humidity, frequent rainfall, and coastal exposure accelerate metal degradation, Galvalume significantly extends the service life of buildings and infrastructure.

Exceptional Durability & Longevity

Thanks to its robust coating, Galvalume steel offers a much longer lifespan compared to standard galvanized steel—often lasting 20–30 years or more with minimal maintenance. This extended durability reduces the need for repairs, replacements, and associated costs over time.

Structures made with Galvalume remain structurally sound even under harsh weather conditions, including typhoons and intense UV exposure. This makes it an ideal low-maintenance solution for residential, commercial, and agricultural buildings in tropical regions.

Excellent Heat Reflectivity

One of the most valuable features of Galvalume in hot climates is its high solar reflectance. The aluminum-rich surface reflects up to 75% of solar radiation, significantly reducing heat absorption through roofs and walls.

In the Philippines, where temperatures often exceed 35°C, this thermal performance helps maintain cooler indoor environments, lowering reliance on air conditioning and reducing energy consumption. This not only enhances occupant comfort but also contributes to sustainable building practices and cost savings on electricity.

Aesthetic Versatility and Appeal

Galvalume steel has a sleek, modern silvery-gray finish that complements contemporary architectural designs. Its clean, metallic appearance is ideal for both industrial and residential projects seeking a minimalist or industrial look.

Additionally, pre-painted Galvalume options are widely available, offering a broad palette of colors and finishes. These coatings enhance visual appeal while providing an extra layer of protection against fading, chalking, and environmental wear—making it easy to match branding, design themes, or local aesthetics without sacrificing performance.

Outstanding Formability and Workability

Despite its strength, Galvalume steel is highly formable and can be easily cut, bent, and shaped into various profiles such as trapezoidal sheets, standing seams, and custom panels. This adaptability makes it suitable for complex roof designs, curved structures, and intricate façades.

Its excellent workability allows for efficient on-site or factory fabrication, reducing labor time and material waste. Whether used for roofing, wall cladding, gutters, or structural framing, Galvalume offers unmatched versatility across diverse construction applications.

Note: While Galvalume is highly resistant to corrosion, proper installation and fastening techniques are crucial to prevent galvanic corrosion when in contact with dissimilar metals like copper or untreated steel. Always use compatible fasteners and follow manufacturer guidelines to ensure optimal performance and longevity.

Uses of Galvalume Coated Steel

Galvalume coated steel—composed of 55% aluminum, 43.4% zinc, and 1.6% silicon—is a high-performance metal alloy renowned for its exceptional durability, corrosion resistance, and heat reflectivity. Its unique coating provides superior protection compared to traditional galvanized steel, making it a preferred material across various industries, especially in tropical and humid climates like the Philippines. Below are the primary applications of Galvalume steel, expanded with technical insights and real-world benefits.

Roofing Applications

Galvalume-coated steel is widely used in roofing systems across the Philippines due to its ability to withstand high humidity, salt-laden air, and intense UV exposure. The aluminum in the coating forms a protective oxide layer, significantly slowing corrosion and extending roof life up to 25–30 years with minimal maintenance.

• Its high solar reflectance reduces attic temperatures by up to 15°F, lowering indoor cooling demands and improving energy efficiency
• Ideal for both residential and industrial buildings in coastal and urban areas where rust is a major concern
• Resists thermal expansion and contraction, minimizing leaks and structural stress over time

Pro Tip: Pair with insulated roof panels for enhanced thermal performance in tropical climates.

Wall Cladding and Siding

Used extensively in both modern residential homes and commercial façades, Galvalume steel offers a sleek, clean appearance with excellent weather resistance. Its smooth surface accepts paint and finishes well, allowing for architectural customization without sacrificing durability.

• Acts as a moisture and wind barrier, protecting structural framing from water infiltration
• Low maintenance—requires only occasional rinsing to remove dust and debris
• Fire-resistant properties enhance building safety in densely populated areas

Design Advantage: Available in a range of colors and profiles (e.g., ribbed, standing seam) to match aesthetic preferences.

Residential Construction Components

Beyond roofing, Galvalume steel is used in critical residential elements such as gutters, downspouts, flashings, and fascia boards. These components are exposed to constant water flow and weather extremes, making corrosion resistance essential.

• Withstands heavy monsoon rains and typhoon conditions common in the Philippines
• Lightweight design eases installation and reduces load on roof structures
• Resists moss and algae buildup better than traditional steel or aluminum

Long-Term Benefit: Reduces repair frequency and maintenance costs over the building’s lifecycle.

Commercial and Industrial Buildings

Warehouses, factories, and large retail spaces rely on Galvalume steel for roofing and wall systems due to its cost-efficiency and long service life. The material performs exceptionally well in industrial environments where chemical exposure, high foot traffic, and mechanical stress are common.

• Offers a high strength-to-weight ratio, reducing the need for heavy support structures
• Cost-effective alternative to stainless steel with comparable corrosion protection
• Suitable for pre-engineered metal buildings (PEMBs), enabling faster construction timelines

Business Value: Lower lifecycle costs make it ideal for budget-conscious developers and investors.

Gutters and Downspouts

Continuous exposure to rainwater makes gutters and downspouts highly susceptible to rust and degradation. Galvalume’s aluminum-zinc alloy coating provides a dual-layer defense: aluminum resists atmospheric corrosion, while zinc sacrificially protects cut edges and scratches.

• Performs reliably through prolonged wet seasons without rusting or leaking
• Maintains structural integrity even when debris accumulates
• Easily formed into seamless lengths, minimizing joints and potential leak points

Maintenance Note: Regular cleaning extends functionality and prevents clogging-related damage.

Automotive Industry Applications

While not as common as in construction, Galvalume-coated steel is used in select automotive components requiring rust protection and lightweight performance. It is particularly suited for underbody parts, wheel wells, and internal structural elements exposed to moisture and road salts.

• Protects against undercarriage corrosion caused by rain, mud, and road de-icing agents
• Lightweight nature contributes to improved fuel efficiency and reduced emissions
• Used in commercial vehicles and agricultural equipment operating in harsh environments

Emerging Use: Increasingly adopted in electric vehicle (EV) battery enclosures for corrosion resistance and thermal management.

Professional Recommendation: For tropical climates like the Philippines, Galvalume steel outperforms standard galvanized steel in both longevity and energy efficiency. When specifying materials, consider pre-painted Galvalume for enhanced aesthetics and additional UV protection. Always ensure proper installation techniques—such as using compatible fasteners and sealants—to maximize performance and prevent galvanic corrosion.

Additional Advantages of Galvalume Steel

• Sustainability: Fully recyclable and often made with recycled content, supporting green building certifications like BERDE or LEED
• Thermal Performance: Reflects up to 70% of solar radiation, contributing to cooler indoor environments and reduced HVAC loads
• Cut-Edge Protection: Zinc in the coating migrates to exposed edges, providing self-healing corrosion resistance
• Aesthetic Versatility: Compatible with paint systems for color customization and branding in commercial projects
• Installation Efficiency: Lightweight and pre-fabricated panels allow for faster, safer installation with fewer labor hours

How to Choose Galvalume Coated Steel in the Philippines

Selecting the right galvalume coated steel is essential for ensuring long-term durability, corrosion resistance, and cost-effectiveness in construction and industrial projects across the Philippines. With the country's tropical climate—characterized by high humidity, heavy rainfall, and coastal salt exposure—choosing the appropriate material is crucial. This comprehensive guide outlines the key factors to consider when selecting galvalume steel, helping you make informed decisions that balance performance, aesthetics, and value.

Important Note: Galvalume steel combines the best properties of aluminum and zinc, offering superior protection against rust and weathering compared to traditional galvanized steel. However, improper selection or installation can compromise its performance, especially in harsh Philippine environments.

Key Factors to Consider When Choosing Galvalume Steel

• Thickness and Gauge

  The thickness or gauge of galvalume steel directly impacts its strength, durability, and suitability for different applications. Gauge numbers are inversely related to thickness—higher gauge numbers indicate thinner sheets. For example:

  • 26–29 Gauge: Ideal for residential roofing and lightweight cladding where structural load is minimal.
  • 22–24 Gauge: Recommended for commercial buildings, warehouses, and industrial structures requiring greater strength and wind resistance.
  • Below 22 Gauge: Used in heavy-duty applications such as structural framing or areas exposed to extreme weather conditions.

  Always consult local building codes and consider wind load, roof pitch, and expected lifespan when selecting the appropriate gauge.

• Coating Composition and Corrosion Resistance

  Galvalume’s exceptional performance stems from its unique coating alloy, typically composed of 55% aluminum, 43.5% zinc, and 1.5% silicon. This combination provides:

  • Superior resistance to atmospheric corrosion—up to 4 times longer than galvanized steel.
  • Excellent performance in coastal and high-humidity environments common in the Philippines.
  • Enhanced heat reflectivity, contributing to energy efficiency in buildings.

  Verify the coating weight (measured in grams per square meter, g/m²) with your supplier. A standard coating weight is around 150 g/m² (AZ150), but higher weights (e.g., AZ200) offer extended protection for critical or long-term projects.

• Brand Reputation and Manufacturer Quality

  Not all galvalume products are created equal. Reputable manufacturers adhere to international standards (such as ASTM A792 or JIS G3321) and maintain consistent quality control. To evaluate brand reliability:

  • Check for certifications and compliance with Philippine Standard (PS) or Import Commodity Clearance (ICC) marks.
  • Review customer testimonials, project case studies, and third-party testing results.
  • Consider brands with a proven track record in Southeast Asian markets, particularly those tested in similar climatic conditions.

  Well-known global and regional suppliers include Nippon Steel, BlueScope, and local Philippine-based steel producers with strong quality assurance systems.

• Pre-Painting and Surface Finishes

  Pre-painted galvalume steel (also known as color-coated steel) enhances both aesthetic appeal and functional protection. When selecting pre-painted options, pay attention to:

  • Paint Type: Polyester (PE), silicon-modified polyester (SMP), or fluoropolymer (PVDF) coatings—each offering different levels of durability and color retention.
  • Adhesion Quality: Ensure the paint bonds well with the galvalume substrate to prevent peeling or chalking.
  • UV Resistance: Critical in the Philippines’ intense sunlight; PVDF coatings offer the best long-term color stability.
  • Finish Options: Matte, glossy, or textured finishes can influence both appearance and dirt resistance.

  Pre-painted sheets are ideal for roofing, wall panels, and façades where visual appeal and low maintenance are priorities.

• Warranty and Performance Guarantees

  A comprehensive warranty is a strong indicator of product confidence and quality. Look for warranties that specifically cover:

  • Corrosion (rust-through) protection—typically 10 to 25 years depending on coating and environment.
  • Paint integrity, including resistance to chalking, fading, peeling, and blistering.
  • Environmental applicability—ensure the warranty is valid for tropical and coastal zones.

  Always read the fine print: some warranties may be voided by improper installation, cutting, or exposure to industrial pollutants. Choose suppliers who offer clear, transferable warranties with accessible claims processes.

• Availability, Lead Times, and Local Support

  In the Philippines, logistics and supply chain reliability can significantly impact project timelines. Consider the following:

  • Select suppliers with established distribution networks and local warehouses, especially if your project is in Mindanao, Visayas, or remote areas.
  • Inquire about standard lead times and minimum order quantities (MOQs).
  • Partner with suppliers who offer technical support, cutting services, and delivery coordination.

  Local availability reduces shipping costs and delays, ensuring your project stays on schedule. Suppliers with just-in-time delivery options can further optimize inventory management.

Expert Tip: Before finalizing your purchase, request sample panels to conduct on-site exposure tests. Observe how the material performs over 3–6 months in your specific location—this real-world evaluation can reveal issues not apparent in lab data.

Additional Recommendations for Long-Term Performance

• Ensure proper installation with compatible fasteners (e.g., stainless steel or coated screws) to prevent galvanic corrosion.
• Avoid direct contact with untreated wood or masonry that may retain moisture.
• Clean surfaces periodically with mild detergent to remove salt buildup, especially in coastal areas.
• Inspect cut edges and drill holes—apply touch-up paint or sealant if the coating is compromised.
• Work with certified fabricators and contractors familiar with galvalume handling and joining techniques.

Choosing the right galvalume coated steel in the Philippines involves more than just comparing prices. By evaluating thickness, coating quality, brand reputation, finish options, warranty coverage, and supplier reliability, you can ensure your investment delivers lasting performance and value. Whether for a residential roof, commercial warehouse, or industrial facility, making an informed choice today will protect your structure for decades to come.

Frequently Asked Questions About Galvalume Coated Steel

The longevity of galvalume coated steel in tropical climates is influenced by a combination of environmental and material factors. Unlike standard steel, galvalume is an advanced alloy-coated product composed of 55% aluminum, 43.4% zinc, and 1.6% silicon, which provides superior protection in harsh conditions.

• Humidity: Tropical regions experience consistently high humidity levels, which can accelerate corrosion in less resilient materials. However, galvalume’s aluminum-rich layer forms a stable oxide barrier that resists moisture penetration.
• Salt Mist Exposure: Coastal areas are particularly challenging due to airborne salt particles that promote rust. Galvalume outperforms traditional galvanized steel in these environments because the aluminum component offers better resistance to chloride-induced corrosion.
• Temperature: High ambient temperatures can degrade coatings over time, especially if they absorb excessive heat. Galvalume’s high solar reflectivity reduces surface temperature, minimizing thermal stress and slowing down degradation.
• UV Radiation: Prolonged sun exposure can break down organic coatings, but galvalume’s inorganic metallic layer remains stable under UV light, maintaining its integrity for decades.

Studies show that galvalume roofing in tropical zones can last 25–40 years with minimal maintenance, significantly outperforming conventional galvanized alternatives. Its reflective properties not only extend lifespan but also contribute to energy savings in buildings.

In many parts of Asia—particularly the Philippines, Indonesia, and Thailand—contractors increasingly favor galvalume over galvanized steel for roofing and structural applications. This preference is driven by performance, cost, and climate suitability.

• Superior Corrosion Resistance: Galvalume’s unique coating composition provides up to four times greater resistance to rust than traditional galvanized steel, especially in humid and saline environments.
• Heat Reflectivity: The aluminum content reflects up to 75% of solar radiation, reducing indoor temperatures and lowering cooling costs—critical in tropical climates where air conditioning usage is high.
• Cost-Effectiveness: While slightly more expensive upfront than galvanized steel, galvalume’s longer service life and reduced maintenance needs result in lower lifecycle costs. This makes it ideal for large-scale residential, commercial, and industrial projects.
• Aesthetic Longevity: Galvalume retains its appearance longer, with less fading and chalking compared to painted or galvanized alternatives.

As a result, galvalume has become the go-to choice for roofing systems in tropical construction, supported by building codes and endorsed by engineering professionals across Southeast Asia.

Yes, galvalume steel is considered an environmentally sustainable building material due to its energy-efficient production, recyclability, and contribution to green building practices.

• Lower Energy Consumption: The manufacturing process for galvalume requires less energy compared to other coated steels because the aluminum-zinc alloy coating can be applied at lower temperatures and with greater efficiency.
• High Recyclability: Steel is one of the most recycled materials in the world, and galvalume is no exception. It can be recycled repeatedly without loss of quality, reducing landfill waste and the need for raw material extraction.
• Energy Efficiency in Use: Buildings with galvalume roofing experience reduced heat absorption, leading to lower reliance on air conditioning systems. This translates to decreased energy consumption and carbon emissions over the building’s lifetime.
• LEED Certification Support: The use of galvalume can contribute to points under green building rating systems like LEED (Leadership in Energy and Environmental Design), particularly in categories related to sustainable materials and energy optimization.

From production to end-of-life, galvalume supports a circular economy and aligns with global sustainability goals in construction and manufacturing.

Galvalume offers distinct advantages over both pure aluminum-coated and traditional zinc-coated (galvanized) steel, combining the best properties of each into a single high-performance material.

The secret lies in the metallurgical bond between aluminum and zinc in the coating. The zinc acts sacrificially to protect exposed edges and scratches, while the aluminum forms a dense, non-porous layer that resists moisture and UV degradation. This dual-action mechanism makes galvalume more durable than either aluminum or zinc alone, especially in aggressive environments.

Yes, galvalume-coated steel is increasingly used in the automotive industry, particularly for exterior body components and under-the-hood applications where corrosion resistance and thermal performance are critical.

• Rust Protection: The coating provides excellent resistance to moisture, road salts, and atmospheric corrosion—common causes of rust in vehicles. This extends the lifespan of body panels and improves resale value.
• Thermal Stability: Components like hoods, roofs, and exhaust systems benefit from galvalume’s ability to reflect heat, helping to manage engine bay temperatures and improve cabin comfort.
• Formability and Weldability: Galvalume steel maintains the mechanical properties needed for automotive manufacturing, including deep drawing, bending, and spot welding, without compromising coating integrity.
• Weight and Strength: It offers a favorable strength-to-weight ratio, contributing to fuel efficiency without sacrificing durability.
• Applications: Commonly used in hoods, trunk lids, roof panels, fenders, and even structural reinforcements in modern vehicles.

Automakers in regions with high humidity and coastal exposure—such as Southeast Asia and the Gulf Coast of the U.S.—are adopting galvalume to enhance vehicle longevity and reduce warranty claims related to corrosion. Its performance and cost-efficiency make it a smart choice for next-generation automotive design.