How to Seal a Metal Roof?

Knowing how to seal your metal roof is essential for increasing its durability and ensuring your home is weatherproof. Sealing your metal roof will also prevent water leaks that cause costly mold damage or structural warping.

This post will explain how to apply metal roof coating to stop leaks. We’ll start by appreciating the benefits of metal roof sealing before explaining how to assess your roof before selecting the right product. We’ll then cover how to apply and inspect your metal roof sealer for the best results.

Understanding the Benefits of Metal Roof Sealing

1. Increased Longevity

Metal roofs offer impressive longevity, but sealing them can further enhance their ability to withstand harsh weather conditions like rain or snow storms and high winds. 

The sealant is an additional protective layer, preventing water infiltration and reducing the risk of corrosion or rust on the metal surface. So, it’s impressively water-resistant, extending your roof’s lifespan and yielding long-term cost savings.

2. Cost-Effectiveness 

Metal roof sealing is significantly cost-effective, compared to replacing an entire roof. Sealing the roof can address minor issues, such as small leaks or surface damage, without a complete replacement. 

This cost-saving measure is particularly advantageous when the roof’s structural integrity remains intact, and only surface-level maintenance is necessary.

3. Preventing Leaks and Further Damage

Over time, metal roofs develop gaps, cracks, or loose seams due to natural weathering or thermal expansion and contraction. These vulnerable areas can lead to water penetration and subsequent leaks. 

By applying a metal roof sealer, you can fill these gaps and create a watertight barrier that prevents leaks. Additionally, the sealant can reduce the need for frequent maintenance by protecting the roof from adverse environmental factors.

Assessing the Condition of Your Metal Roof

It’s crucial to address existing issues before proceeding with the sealing process. Note any identified damage, leaks, or weak spots, and plan for necessary repairs. 

Sealing a damaged roof without addressing underlying issues may only provide a temporary solution and could lead to further problems.

To inspect a metal roof for signs of damage or wear, follow these steps:

1. Begin by visually examining the entire roof surface. Look for any signs of corrosion, rust, or loose or missing panels. Check areas where water could accumulate, such as valleys or around penetrations.
2. Check the roof for water stains or other signs of leaks on the ceiling or walls inside the building. Such signs indicate potential areas of damage on the roof.
3. Inspect the roof flashing, the metal material used to seal roof joints, and transitions. Ensure it’s securely attached and in good condition.
4. Look for loose screws, fasteners, or roof accessories that need tightening or replacement.

Identifying Potential Leak-Prone Areas and Weak Spots

1. Pay close attention to areas where different roof surfaces meet, such as valleys, ridge caps, and seams. These are common areas for leaks to occur.
2. Check around chimneys, vents, skylights, or any other roof penetrations. These areas are susceptible to water infiltration and should be carefully inspected for any signs of damage or deterioration.
3. Examine the condition of the gutters and downspouts, as clogged or damaged drainage systems can contribute to water backup and roof problems.

Choosing the Right Metal Roof Sealant

Different types of metal roof sealants are available on the market. Some standard options include:

• Acrylic coatings.
• Elastomeric adhesives.
• Silicone sealants.
• Polyurethane-based sealants. 

Each class has unique properties and suitability for specific applications.

Factors to Consider When Selecting a Sealant

1. Compatibility with Your Metal Roofing Material

Ensure that the sealant is specifically designed for metal roofs and compatible with the metal type you used for your roof.

2. Climate Conditions

Consider the climate in your region, and choose a sealant appropriate for your local weather patterns. Some are better suited for hot or humid climates, while others perform well in cold or rainy conditions. 

3. Reflectivity and Energy Efficiency

Some sealants offer reflective properties that can help reduce heat absorption, leading to energy savings and a cooler interior environment.

How to Seal a Metal Roof

Preparing Your Metal Roof for Sealing

To prepare the roof surface for sealing, start by repairing minor damages or leaks before applying the sealant. Then, follow these necessary steps:

1. Clean the Roof

Remove any debris, dirt, or loose material from the roof surface using a broom or air blower. It’s essential to have a clean surface for optimal sealant adhesion.

2. Remove Rust or Corrosion

If you encounter areas with rust or corrosion, remove them using a wire brush or sandpaper. Apply a rust-inhibiting primer to prevent further corrosion.

3 Dry and Prime the Roof Surface 

Moisture on the roof surface can interfere with the adhesion and performance of the sealant. If necessary, allow the roof to dry completely before proceeding. 

Additionally, priming the roof with a suitable primer can improve the bond between the sealant and the metal surface, enhancing the overall effectiveness of the sealing process. 

Most importantly, follow the manufacturer’s instructions for proper priming techniques and materials.

Applying the Metal Roof Sealant

Depending on your chosen product, there are three popular methods for sealant application: brushing, rolling, or spraying 

1. Brushing 

Using a brush, apply an even layer of sealant over the entire surface area that needs to be sealed. Keep a wet edge as you move across the roof, and avoid overlapping brush strokes.

2. Rolling 

Use a roller to apply an even sealant layer over the entire surface area that needs to be sealed. Work in small sections and maintain consistent pressure while rolling to ensure optimal adhesion. Avoid overlapping rolls, and keep a wet edge as you progress. 

3. Spraying 

Using a sprayer, apply an even sealant layer over the surface area that needs sealing. Keep the nozzle perpendicular to the roof and maintain consistent pressure while spraying. Avoid overlapping strokes, and keep a wet edge as you progress. 

Additional Tips for Effective Metal Roof Sealing

1. Hire a professional for the job to avoid making mistakes.
2. Work in small sections and maintain consistency when applying the sealant. 
3. Allow each coat of sealant to dry before applying an additional layer. 
4. Regularly inspect and reseal if necessary to ensure optimal protection against water penetration and other environmental factors that can cause deterioration over time. 
5. Prepare for proper disposal of any leftover sealant and cleaning materials. 
6. Use protective gear, like gloves or safety glasses, to minimize the injury or contamination risk while working on the roof.

Final Thought on Metal Roof Sealing

Metal roofs offer an attractive and durable option for homeowners looking to protect their property from severe weather conditions. With proper maintenance and regular resealing, metal roofs can last many years and provide reliable protection against water infiltration. 

When resealing a metal roof, use the suitable sealant for your type of metal roofing material and climate conditions. At Jacob’s Ladder, we provide expert assistance for your roof repair and ensure a professional and long-lasting seal. Contact us today for more information!