April and Spring are here in the great Mid-Atlantic, which means potholes are appearing on most roads, and sunset is close to 7 pm. April marks the end of the annual “Coating Nerd’s” hibernation, while springtime brings the widest temperature swings we will experience in most of North America. The same thermal shock causing all the potholes in our roads also stresses most roofing systems to their thermal limits. A silicone roof coating is a reliable solution for maintaining roofs during these extreme temperature fluctuations. Its ability to expand and contract with the roof helps prevent cracking and damage, making it ideal for areas that experience dramatic seasonal changes.
As the weather warms up, many of you will be out doing maintenance and clean-up on existing roofs. It’s important to inspect and maintain the condition of silicone roof coatings regularly to ensure they provide maximum protection. In this blog, we’ll walk through the necessary steps to follow for repairing a silicone-coated roof, so you can keep your roof in optimal shape through the season.
How to Repair Silicone Roof Coating: Tips for Effective Maintenance
One common question we receive every Spring is, “How do I repair silicone roof coating?” It’s normal for seams or areas in the original membrane to crack or split after winter, especially on older roofs with features like cast iron waste stacks. Keep in mind that waste stacks are fixed into the floor, meaning they don’t move. A significant temperature change, like a 30-degree swing, can cause movement around the stack’s penetration in the roof deck.
The first rule for repairing or recoating any silicone roof coating is: “Only silicone will stick to silicone, and even that may not always work!”
Whenever possible, it’s best to use the same material for repairs to avoid any unwanted reactions between products. If you’re uncertain, always apply a small test sample to ensure proper adhesion.
The Importance of Regular Inspections for Silicone Roof Coatings
Regular inspections are key to ensuring the longevity of your silicone roof coating. These coatings are designed to be durable, offering resistance to UV rays and standing water, but they are not immune to damage. The freeze-thaw cycle, especially in the spring, can cause cracks, blisters, or even peeling in your roof’s silicone coating. These issues are often subtle and may not be easily noticeable unless the roof is inspected thoroughly.
An effective inspection should be conducted at least twice a year, ideally in the spring and fall, to assess the roof’s condition. Look for visible cracks, separation, or areas where the coating may be peeling off. Pay close attention to seams and areas around roof penetrations, such as waste stacks, as these are particularly vulnerable to movement caused by temperature fluctuations.
In addition to checking for surface damage, make sure to inspect the edges and corners of the roof, as they are more prone to wear. If you notice any small damage, address it immediately to prevent larger issues from developing, saving both time and money on repairs. Catching these issues early will extend the life of your roof and maintain its performance.
How to Properly Apply Silicone Roof Coating for Effective Repairs
When it comes to repairing silicone roof coatings, preparation is key. The process requires a combination of proper cleaning, surface roughening, and using the right materials to ensure a strong bond. The first step in the repair process is cleaning the affected area. Use a commercial cleaner to remove dirt and debris, followed by a solvent, such as acetone, to wipe the surface clean. Allow it to dry completely to ensure the repair materials bond properly.
Next, it’s important to roughen up the surrounding area of the repair site. Use an abrasive pad like Scotch-Brite to scuff the existing silicone coating. This step increases the adhesion of the new silicone to the old, especially when using high-solids silicone, which has less solvent and may have trouble bonding without this preparation.
Once the surface is prepared, apply the silicone coating generously over the repair area. Use a wet mil gauge to ensure you’re applying the right thickness typically, a 24 wet mil base coat works best. Don’t forget to reinforce the area with fabric while the coating is still wet. Apply a final topcoat to encapsulate the fabric and ensure complete coverage. Be sure the fabric’s pattern is no longer visible under the topcoat; if it is, add more silicone for a seamless finish. By following these steps, you can ensure that the repair will last and keep your roof in top condition for years to come.
Materials Needed for a Silicone Roof Coating Repair
For your silicone roof coating repair, you’ll need the following materials and tools:
- SMARTCOAT 210 Universal Primer: Enhances adhesion to most roofing materials.
- SMARTCOAT 200 Asphalt Bleed Blocker: Prevents oil exudate or “bleed-through” on asphalt roofs.
- SMARTCOAT 220 Asphalt Emulsion: Rejuvenates aged, brittle asphaltic surfaces before coating.
- SMARTCOAT 450 High Solids Silicone Coating
- For long-lasting, seamless repairs, 365 RepairMaster offers superior flexibility and adhesion.
- SMARTCOAT 100 Roof Wash
The first rule when repairing or recoating a silicone coating is: “The only thing that sticks to silicone is silicone, and sometimes even that doesn’t work!”
To avoid product reactions, use the same material for repairs whenever possible. If uncertain, always test adhesion with a small sample before proceeding.
Preparation is Key for Silicone Roof Coating Application
When applying silicone roof coating, always start by thoroughly cleaning the area. Silicone is a fantastic material known for its flexibility, chemical resistance, and water-resistant properties. It’s also soft, slightly tacky to the touch, and can easily collect dirt, especially after a year of use. Anyone who’s worked on a silicone roof will understand this firsthand.
To begin, clean the surface using a commercially available cleaner and water. Rinse well and allow the area to dry. It’s important to remove any loose coating by trimming back to the well-adhered layers.
Next, clean the repair area with a solvent and a clean cloth. Let the solvent evaporate completely. Only use high-quality acetone or virgin paint thinner (VMP) solvent. Avoid using recycled thinner, as it often contains water and impurities that could affect the performance of the silicone coating.
Preparing a Silicone Roof Coating for Repair
Begin by roughing up the surrounding silicone coating. Use a Scotch-Brite abrasive pad to scrub the area to be repaired, ensuring the surface becomes rough to the touch.
The texture should be noticeable, which is particularly important when using a high-solids formulation of silicone. This type of silicone has minimal solvent, which limits the chemical bonding of repair materials, making this step crucial.
After scuffing, clean the area once again with a solvent and allow it to flash off or dry completely before proceeding with the repair.
Use Enough Silicone Coating
A common mistake is applying insufficient coating to fully cover the repair area and saturate the reinforcing fabric. For the best results, apply a 24 wet mil basecoat of silicone to the repair area. Use a wet mil gauge to ensure accuracy.
It may seem like a lot of coating, but it’s essential for a successful repair!
Reinforce
Always use reinforcing fabric in repair areas and apply it while the coating is still wet. Extend the fabric 2-4″ beyond the repair area. Install the fabric over the wet base coat similarly to paper mache. Speed tips include pre-cutting reinforcing fabric pieces to size, then dipping them into a separate container of silicone coating before application.
Topcoat the Repair
Once the fabric reinforcing is in place, apply a final coat of silicone coating at 10-16 wet mils over the reinforcing fabric. This will fully encapsulate the fabric. The fabric’s pattern should be difficult to see under the coating. If the pattern is still visible, add a bit more coating to that area.
Meet SMARTCOAT™: CertainTeed’s Comprehensive Line of Low-Slope Roof Restoration
SmartCoat™ roof coatings restore instead of replacing, saving money, time, and environmental impact. Designed to work over nearly any existing substrate, the system eliminates unnecessary tear-offs and factory-made replacements.
Most Commonly Treated Surface Types
Roof coatings can be applied to most membrane or metal roofing systems, whether new or existing. The suitability for restoration depends on the roof’s condition. Some surfaces require additional preparation to ensure optimal adhesion.
Common candidates include:
- EPDM
- TPO
- Modified Bitumen
Conclusion
Maintaining your silicone roof coating is essential for ensuring longevity and preventing costly repairs. Regular cleaning, inspection, and timely repairs can extend the lifespan of your roof while preserving its effectiveness in withstanding UV rays and standing water. By following the steps outlined such as using the correct materials, applying sufficient coating, and reinforcing the repair areas you can maintain a high-performing roof. In addition, leveraging quality products like SmartCoat™ for restoration can help preserve your investment and enhance the sustainability of your roofing system. Stay proactive with your roof maintenance and reap the benefits of a durable, long-lasting solution.
FAQs
How often should I inspect my silicone roof coating?
Inspect your silicone roof coating at least twice a year, preferably in spring and fall, for any damage.
Can I use a different material for silicone roof repairs?
No, only silicone will adhere properly to silicone roof coatings. Always use silicone-based products for repairs.
What is the best way to clean a silicone roof before applying a new coating?
Clean the roof with a commercial cleaner and water, followed by a solvent and a clean cloth to remove debris.
How thick should I apply the silicone coating during repairs?
Apply a 24 wet mil basecoat to the repair area for the best results, ensuring proper coverage and adhesion.
What is the role of reinforcing fabric in silicone roof repairs?
Reinforcing fabric helps strengthen the repair area and ensures the silicone coating bonds securely, preventing further damage.
