Insulated metal roof and wall panels feature functionality, durability, and aesthetics to stand the test of time, but safeguarding your investment requires maintenance.

Effective cleaning and care will ensure the longevity and appeal of insulated metal panels (IMPs) – with even a splash of plain water able to rejuvenate metal roof and wall panels that must battle the elements daily.

“All painted buildings chalk and retain dirt to some degree. Mildew builds up, especially in damp areas,” says U.S. Steel. “Often, the only thing the building needs is cleaning. Removal of the dirt restores much of the building’s brightness and original color. Rust problems can be unsightly but may only need cleaning or minor repair while cleaning.”

Protective Coatings and Environmental Challenges

Insulated roof and wall panels are manufactured with interior and exterior finishes that include high-performance coatings such as fluoropolymer, silicone polyester, and polyester.

The good news is that the molecules on the surface of these high-performance coatings are so tightly bound together that it makes them resistant to many elements found in the environment such as air pollution, acid rain, and general airborne dirt.

While these IMP coatings are robust, periodic cleanings can address the accumulation of resins and other residues and will extend the life of these finishes.

Common Culprits that Require Building Cleaning and Care

From the day buildings are constructed, they fight the elements in a 24/7 battle to age gracefully.

Insulated metal roof and wall panels not only have to combat the relentlessness forces of wind, water, UV rays, and temperature fluctuations but are also susceptible to a range of contaminants. These include:

• Airborne Dirt and Organic Residues: Rainwater isn't always enough to cleanse greasy, organic deposits and airborne dirt from panels.
  
  
• Chalk Film: UV-induced paint degradation leads to chalky deposits, dulling colors, and diminishing gloss.
  
  
• Biological Growth: Moist areas can harbor mildew and other biological growths, especially on surfaces that remain moist for extended periods such as north walls, under eaves, or sheltered areas.
  
  
• Rust Stains: Leftover steel debris, unprotected edges, and similar factors can lead to rust stains.
  
  
• Foreign Substances: Some of the foreign substances that can mar the appearance of a steel building include graffiti, dust, mud, mortar splashes, excess sealants, mineral deposits, salt sprays, excess sealants, oil and grease marks, and industrial pollutants.

Start Simple: Water Works Wonders

Drinking plenty of water is a simple life hack to help humans to a longer lifespan, and water works wonders for caring for metal buildings as well.

Starting with a straightforward approach, coating expert Valspar suggests employing plain water via hoses or pressure spray equipment to dislodge surface deposits on metal roof and wall panels.

Water should be applied to your building at least once a year to clean it but may need washing up to three times annually in certain areas with environmental hazards.

Two key points to remember before initiating the cleaning process with water or other substances are:

• Avoid Abrasive Tools: Wire brushes or abrasive cleaners should be bypassed to prevent damaging the coating.
  
  
• Test Cleaning Agents: Always test cleaning agents in inconspicuous areas before widespread application.

While water is a great starting point, for persistent residues, more potent methods become necessary.

Graduating to Detergents and Solvents

The cleaning options for your metal building beyond plain water include two groups:

• Hot or Cold Detergent Solutions: A 5 percent solution of common commercial detergents in water, followed by thorough rinsing, can safely remove deposits. Use a cloth or sponge for application.
  
  
• Solvents: For non-water soluble deposits like tar, grease, oil, and graffiti, a range of solvents can be employed with caution:
  

o   Alcohol such as ethanol (denatured alcohol) and rubbing alcohol (isopropyl alcohol).

o   Petroleum Solvents and Turpentine (VM&P naphtha, mineral spirits, kerosene, turpentine).

o   Aromatic Chlorinated Solvents (Xylol, Toluol)

o   Ketones, Esters, Lacquer Thinner, and Paint Remover.

Always remember that most organic solvents are flammable and/or toxic and must be handled with care.

Cleaning solvents should be kept away from sparks, electric motors, and open flames, and always use adequate ventilation, and protective gear such as goggles.

You should avoid using harsh chemicals when cleaning steel buildings, as they can damage the surface finish. You should also check with the manufacturer before using any substances to ensure you do not void the warranty.

Addressing Special Cleaning Concerns

Mildew, rust, and graffiti are three of the special concerns that building owners must confront when cleaning their steel walls and roofs. Here is how to tackle all three:

• Graffiti: Combat graffiti with soap, water, and solvents. If these fail, consider touch-ups, repainting, or replacement. A pressure washer can remove graffiti from most surfaces – start with a low-pressure spray pattern and move the nozzle closer to the surface until the graffiti starts to come off. Keep in mind that older graffiti can be harder to remove and can irreversibly damage the surface.
  
  
• Mildew: High-humidity areas might breed mildew. A solution comprising laundry detergent, sodium hypochlorite, and water can help eliminate it. In addition to mild detergent, some have found that a solution of vinegar and baking soda can remove mildew. Care should be taken when using solutions with bleach or ammonia.
  
  
• Rust Stains: Diluted hydrochloric, citric, or muriatic acid can assist in removing rust stains, but always limit contact to five minutes and flush with water.

20 Best Practices to Care for Your Metal Building

When it comes to the care and cleaning of your metal building, try these 20 best practices:

1.      Regular Inspection: Conduct routine inspections of your metal building to identify any signs of dirt buildup, rust, paint chipping, or other potential issues.

2.      Scheduled Cleaning: Set a regular cleaning schedule based on the environment and level of exposure. This could be quarterly, semi-annually, or annually, depending on your building's location and conditions.

3.      Start with Water: Begin your cleaning process with plain water using hoses or pressure spray equipment. This often removes superficial dirt and debris effectively.

4.      Use Soft Brushes or Cloths: For stubborn grime, use soft brushes or cloths to gently scrub the surface. Avoid abrasive tools that can damage the coatings.

5.      Select Mild Detergents: If water alone is insufficient, opt for mild, non-abrasive detergents. Test the detergent in a small, inconspicuous area first to ensure compatibility with the coatings.

6.      Solvent Safety: If using solvents, carefully follow manufacturer instructions and safety guidelines. Ensure proper ventilation, wear protective gear, and keep away from open flames or sparks.

7.      Target Contaminants: Tailor your cleaning approach to the type of contaminant. Use appropriate solvents for removing graffiti, specialized solutions for mildew, and diluted acids for rust stains.

8.      Gentle Pressure: When using pressure spray equipment, avoid excessive pressure that could damage coatings or push water into crevices. Use a moderate pressure setting.

9.      Rinse Thoroughly: After cleaning, always rinse the surfaces thoroughly with clean water. Residual cleaning agents or chemicals could lead to deterioration if not washed off properly.

10.  Avoid Standing Water: Prevent water from pooling or standing on metal surfaces, as it can lead to premature corrosion. Ensure proper drainage to redirect water away from the building.

11.  Minimize Abrasion: During cleaning, avoid aggressive scrubbing or abrasive materials that can scratch or wear down the coatings.

12.  Mind Weather Conditions: Choose a calm, dry day for cleaning. Windy conditions can spread cleaning agents, and rain shortly after cleaning might affect the results.

13.  Document Cleaning: Keep records of your cleaning efforts, including dates, methods, and any challenges you encounter. This documentation can help refine your cleaning approach over time.

14.  Safety First: Prioritize safety for yourself and those involved in the cleaning process. Use appropriate protective equipment and follow all safety guidelines.

15.  Consult Manufacturer Guidelines: Refer to the manufacturer's recommendations for cleaning and maintenance, as they are tailored to the specific coatings and materials used in your metal building.

16.  Professional Assistance: For complex cleaning tasks or in case of extreme contamination, consider consulting professionals who specialize in metal building maintenance.

17.  Preventive Measures: Implement measures to prevent contaminants in the first place, such as regular landscaping to prevent organic growth, and addressing sources of rust, like steel debris.

18.  Touch-Up Painting: If you notice chipped or peeling paint during cleaning, address it promptly with touch-up painting to prevent further deterioration.

19.  Educate Staff: If your building is maintained by a team, ensure that everyone involved understands the proper cleaning techniques and safety protocols.

20.  Continuous Monitoring: Keep an eye on the condition of your building even after cleaning. Regular monitoring allows you to catch issues early and take corrective action.

Contact Green Span Profiles today for insulated metal panel technologies that can stand the test of time.