Wall cladding coatings are protective layers applied to the exterior surfaces of buildings to safeguard cladding materials from environmental damage, such as UV radiation, moisture, and pollutants. These coatings enhance the durability and longevity of the cladding by preventing corrosion, fading, and deterioration. Additionally, they can improve the building’s aesthetic appeal and energy efficiency by providing a clean, uniform finish and, in some cases, reflective properties to reduce heat absorption.
What Are Wall Cladding Coatings?
Wall cladding coatings are specialised protective layers applied to the exterior surfaces of buildings, specifically designed to enhance the durability and longevity of cladding materials. These coatings serve as a barrier against environmental factors such as UV radiation, moisture, pollutants, and temperature fluctuations, which can cause cladding to deteriorate over time. By preventing issues like corrosion, fading, and water ingress, wall cladding coatings help maintain the structural integrity and appearance of the building.
In addition to protection, these coatings can improve a building’s aesthetic appeal by providing a clean, uniform finish. Some coatings are also designed to enhance energy efficiency, offering reflective properties that reduce heat absorption and help lower cooling costs. For instance, according to the Building Research Establishment (BRE), reflective coatings can reduce a building's energy consumption by up to 20% during warmer months. The application of wall cladding coatings is a cost-effective way to extend the lifespan of the cladding, reduce maintenance needs, and protect the investment in a building’s exterior.
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What Are The Signs Metal Cladding Needs To Be Coated?
The signs metal cladding needs to be coated include visible rust or corrosion, fading or peeling paint, and the presence of chalking, where a powdery residue forms on the surface. Additionally, if the cladding shows signs of water ingress or leaks, or if the building's energy costs are rising due to poor insulation or reflective properties, it may be time to apply a new coating. Addressing these issues promptly can prevent further deterioration and extend the lifespan of the metal cladding.
- Visible Rust or Corrosion
- Fading or Peeling Paint
- Chalking (Powdery Residue on the Surface)
- Water Ingress or Leaks
- Increased Energy Costs Due to Poor Insulation
1. Visible Rust or Corrosion
Visible rust or corrosion on metal cladding is a clear indication the cladding requires a new coating. Rust develops when the protective layer deteriorates, exposing the metal to moisture and oxygen, which leads to oxidation. If not addressed promptly, corrosion can undermine the structural integrity of the cladding, resulting in further damage. Applying a wall cladding coating seals the metal surface, preventing additional rust and prolonging the lifespan of the cladding. According to the Steel Construction Institute, an appropriate coating can reduce the rate of corrosion by up to 90%, making it a crucial step in maintaining the durability of metal cladding.
2. Fading or Peeling Paint
Fading or peeling paint is another sign metal cladding needs recoating. Over time, UV exposure and environmental factors can degrade the paint, causing it to lose colour and adhesion. When paint begins to peel, it exposes the metal beneath, making it susceptible to corrosion and other damage. Reapplying a wall cladding coating not only revitalises the appearance of the cladding but also provides essential protection against further deterioration, ensuring the cladding remains effective and visually appealing.
3. Chalking (Powdery Residue on the Surface)
Chalking, characterised by a powdery residue on the surface of the cladding, occurs when the binder within the paint breaks down due to prolonged exposure to UV radiation and weathering. This residue indicates the coating is losing its effectiveness and needs replacing. Chalking diminishes the protective capabilities of the coating, leaving the metal cladding vulnerable to potential damage. Recoating the cladding with a high-quality wall cladding coating restores its protective properties and prevents further degradation, thereby safeguarding the building's exterior.
4. Water Ingress or Leaks
Water ingress or leaks are serious signs the metal cladding's protective coating has failed, allowing moisture to penetrate the surface. This not only jeopardises the cladding but can also lead to internal damage, such as mould growth and insulation breakdown. Applying a new wall cladding coating creates a waterproof barrier that seals the surface, preventing further water damage and preserving the structural integrity of the cladding. According to the Building Research Establishment (BRE), proper waterproofing can reduce the risk of internal water damage by up to 50%.
5. Increased Energy Costs Due to Poor Insulation
Rising energy costs may indicate the metal cladding is no longer providing adequate insulation or reflective properties, often due to a deteriorated coating. As the protective layer wears away, the building becomes less efficient at regulating temperature, leading to higher heating and cooling expenses. Reapplying an energy-efficient wall cladding coating can improve the insulation properties of the cladding, reducing energy consumption and lowering utility bills. The Carbon Trust reports that reflective coatings can decrease cooling costs by up to 20%, making recoating a cost-effective solution for energy efficiency.
What Are The Best Wall Cladding Coatings?
The best wall cladding coatings are polyurethane and polyurea coatings. Both of these products are popular for commercial and industrial coatings, known for their exceptional durability and protective qualities. Polyurethane coatings, especially thixotropic types, are ideal for vertical surfaces as they maintain a consistent layer without slumping, offering excellent resistance to UV radiation, moisture, and chemicals. Polyurea coatings, with their rapid curing time and high durability, provide a tough, waterproof barrier that withstands extreme weather and mechanical stress. Both options significantly enhance the longevity and performance of wall cladding, making them top choices for industrial and commercial applications.
- Polyurethane Coatings
- Polyurea Coatings
1. Polyurethane Coatings
Polyurethane coatings, particularly thixotropic formulations, are highly effective for protecting wall cladding due to their ability to maintain a consistent, thick layer on vertical surfaces without slumping. This characteristic is essential for ensuring complete coverage, especially on intricate or irregular surfaces often found in industrial and commercial settings. These coatings are designed to offer robust resistance against UV radiation, which helps prevent fading and degradation over time. Additionally, polyurethane coatings provide strong protection against moisture and chemical exposure, making them ideal for environments where cladding is subjected to harsh weather or industrial pollutants.
The flexibility of polyurethane coatings is another key advantage. As metal cladding expands and contracts with temperature changes, these coatings flex accordingly, preventing cracks and ensuring long-term adhesion. This adaptability extends the lifespan of the cladding and reduces the need for frequent maintenance. Research from the Steel Construction Institute indicates applying polyurethane coatings can extend the service life of wall cladding by up to 20 years, offering a cost-effective solution for maintaining the structural integrity and appearance of buildings.
2. Polyurea Coatings
Polyurea coatings are recognised for their rapid curing time and exceptional durability, making them a preferred choice for wall cladding in demanding environments. These coatings form a tough, waterproof barrier that protects cladding from extreme weather conditions, including heavy rain, strong winds, and significant temperature fluctuations. This resilience is particularly important for industrial and commercial buildings, where exterior surfaces are often exposed to harsh elements and mechanical stress.
Polyurea’s ability to cure quickly, even in varying temperatures and humidity levels, allows for faster project completion, minimising downtime and disruption. Once applied, polyurea coatings demonstrate excellent adhesion and flexibility, similar to polyurethane, which helps prevent cracking and peeling as the cladding moves with temperature changes. This durability makes polyurea coatings a long-term solution for protecting wall cladding, with minimal maintenance required. Research from the British Coatings Federation indicates that polyurea coatings can extend the longevity of wall cladding by up to 25 years, providing reliable protection and reducing overall maintenance costs.
How Do You Apply Coatings To The External Walls On Commercial Or Industrial Buildings?
Coatings are applied to the external walls of commercial or industrial buildings using different methods based on the area size. For large surfaces, spray application is preferred as it offers quick and uniform coverage, ensuring a smooth and even finish across expansive walls. This technique is efficient and ideal for high-volume tasks. In contrast, for smaller or intricate areas, rollers or brushes are used to provide greater precision and control. Before any coating is applied, it is essential to thoroughly clean and prepare the surface to ensure optimal adhesion and a long-lasting finish.
- Inspect the Surface
- Clean the Surface
- Repair Damaged Areas
- Prime the Surface (if necessary)
- Mask and Protect Adjacent Areas
- Select the Application Method
- Apply the Coating
- Inspect the Coated Surface
- Remove Protective Masking
- Final Curing
1. Inspect the Surface
Begin by assessing the external walls for any damage, such as cracks, rust, or flaking paint. Spotting issues early allows for necessary repairs before applying the coating, ensuring its durability and effectiveness.
2. Clean the Surface
Thoroughly wash the walls using pressure washing or appropriate cleaning agents to remove dirt, grime, and any existing coating. For metal surfaces, rust treatment may be needed. A clean base is crucial for securing proper adhesion of the new coating.
3. Repair Damaged Areas
Fix any visible damage, such as cracks or holes. For concrete walls, fill cracks using a suitable filler, and for metal, address rust and patch areas as required. Ensuring the surface is smooth and even helps achieve a uniform coating.
4. Prime the Surface (if necessary)
If the surface is porous or heavily worn, applying a primer is advised to improve adhesion. Priming forms a strong foundation for the new coating and enhances the longevity of the applied finish.
5. Mask and Protect Adjacent Areas
Cover nearby windows, doors, and surfaces using masking tape or protective sheets to prevent accidental coverage. This step is especially important when using a spray method to coat large areas, as it helps avoid overspray.
6. Select the Application Method
For Large Areas: Spray application is ideal for covering extensive surfaces quickly and evenly. Multiple thin layers should be applied to ensure a consistent finish.
For Smaller Areas: Use rollers or brushes to apply coatings in tighter spaces, such as near edges or around windows. This method allows for better precision and control.
7. Apply the Coating
Apply the selected coating method, maintaining a consistent distance from the surface for spray applications to ensure even distribution. Multiple coats may be necessary, with drying times followed as per the manufacturer’s guidelines.
8. Inspect the Coated Surface
After the coating has dried, carefully examine the surface for any missed spots or inconsistencies. Apply additional coats or touch up areas to ensure the coating is smooth and complete.
9. Remove Protective Masking
Once the coating has dried completely, remove all masking materials from adjacent surfaces. Check to ensure no coating has unintentionally spread onto protected areas.
10. Final Curing
Allow the coating to fully cure as per the manufacturer’s instructions. Curing can take several hours to days depending on the coating type and environmental conditions. During this period, ensure the surface remains undisturbed by dust, moisture, or impact.
What Is The Difference Between Wall And Roof Cladding Coating?
The primary difference between wall and roof cladding coatings lies in the specific environmental demands and application techniques required for each surface. Roof cladding coatings are designed to endure more extreme conditions, such as prolonged UV exposure, temperature fluctuations, and water runoff or pooling. As a result, roof coatings are typically thicker and more robust, providing long-lasting protection. These coatings must also resist water penetration and thermal expansion due to constant exposure to the elements.
Wall cladding coatings, are also protective but they are more focused on weather protection. Wall cladding coatings are more focused on shielding the structure from wind and rain. A key function of wall coatings is to preserve the building’s appearance, helping to prevent wear and tear caused by environmental factors. Wall coatings do not generally require the same level of water resistance as those used on roofs.
In both cases, the existing cladding coating needs thorough inspection and preparation to ensure proper adhesion and durability. Cladding refurbishment for both roofs and walls can be done with minimal disruption to the building’s operations. Both roof and wall coatings can be spray-applied for efficient coverage or applied with rollers and brushes for greater precision, depending on the project’s specific needs.
How Much Do Wall Cladding Coatings Cost?
The cost of wall cladding coatings, particularly polyurethane and polyurea coatings, typically ranges from £45 to £120 per square metre. Thixotropic polyurethane coatings are especially recommended for wall cladding due to their excellent adhesion and anti-slump properties, which are crucial for maintaining a consistent protective layer on vertical surfaces. These coatings offer durability and strong resistance to environmental factors such as UV radiation and moisture, making them ideal for long-term protection of cladding materials.
Polyurea coatings are also a highly effective option, known for their rapid curing time and exceptional durability. However, they are generally more expensive, with costs ranging from £70 to £120 per square metre. Polyurea provides a tough, waterproof barrier that can withstand extreme weather conditions, ensuring the cladding remains protected and structurally sound, particularly in industrial and commercial settings.
The overall cost of applying a polyurethane or polyurea coating to wall cladding can be influenced by several factors, including the size and condition of the cladding, access and height challenges, labour rates, and the building’s location. Additional considerations include environmental conditions, the complexity of the project, and any specific regulatory requirements that may apply.
| Type of Cladding Coating | Price Range (per sqm) |
|---|---|
| Polyurethane Coatings (Thixotropic Recommended) | £45 to £90 |
| Polyurea Coatings | £70 to £120 |
*These estimates are general, and actual costs may vary based on specific project requirements, location, and market conditions.
