Compare TPO vs. Silicone Roofs: St. George Roofing Guide

When it comes to protecting your home or commercial roof in St. George, Utah, choosing the right roof coating—whether it’s TPO, silicone roof coating or acrylic roof coatings—is all about understanding your roof’s needs and the roofing industry standards. TPO (Thermoplastic Olefin) is common on commercial roofs. It’s durable, flexible and UV-reflective—potentially reducing cooling costs by up to 30%. But its seams can be prone to leaks if not installed properly and it typically lasts 15-20 years.

Silicone roof coatings are liquid applied and create a seamless, waterproof membrane for both residential and commercial roofs. These products are engineered to withstand all kinds of weather—sunny and rainy. They excel at resisting ponding water, maintaining UV reflectivity over time and reducing rooftop temperatures by up to 20°F—making them low maintenance and long lasting. But they come with a higher upfront cost ($4-7/sq ft), require specialized application and can be slippery when wet unless an anti-slip additive is used.

Acrylic roof coatings are another popular choice in the roofing industry. They offer high solar reflectivity, UV protection and are compatible with many substrates—all at a budget price. Some roof coating products come in custom colors so you can match or enhance the color of your roof. But they don’t handle ponding water well, degrade under constant moisture and have a shorter lifespan of 7-10 years, sometimes as few as 5 in harsh conditions.

What is TPO Roofing?

TPO roofing features a single-ply membrane made from a blend of rubber and synthetics. It’s a common choice for flat or low-slope roofs, celebrated for its durability, flexibility, and energy efficiency. In St. George, where temperatures can soar, TPO shines by effectively reflecting UV rays, which helps keep indoor spaces cooler and lowers energy costs. This reduction in heat absorption is key to maintaining comfortable indoor temperatures and further lowering energy expenses.

Specialized paints and coatings can be used to provide additional protection or to achieve a desired look and feel for the TPO roof surface, but proper surface preparation and the use of suitable primers and paints are essential for long-lasting results.

Pros of TPO Roofing

• Energy Efficiency: TPO can reflect up to 87% of sunlight, which leads to significantly lower cooling costs, especially during the summer. Homeowners could save anywhere from 10% to 30% on their energy bills.

• Durability: TPO is tough against tears, punctures, and impacts. This makes it a reliable option for any roofing system.

• Cost-Effective: TPO is often more affordable than other roofing options. Homeowners might spend approximately $3 to $5 per square foot for TPO installation. Additionally, TPO installation typically requires less labor compared to some other roofing systems, which can further reduce overall costs.

• Flexibility: TPO adapts well to the movement and settling of buildings, a crucial quality in regions where temperatures fluctuate frequently.

Cons of TPO Roofing

• Seams: While TPO features heat-welded seams, improper installation can lead to leaks. It’s essential to consider the installation quality carefully.

• Longevity: TPO may degrade faster under extreme UV exposure. Over time, TPO membranes may develop small defects such as pinholes due to prolonged UV exposure, which can lead to leaks if not addressed. Without protective coatings, it can last around 15 to 20 years, which is shorter than some other options. Property owners are typically expecting a TPO roof to last 15 to 20 years, but this can vary depending on maintenance and environmental exposure. If a previous coat or treatment exists on the roof, it should be carefully assessed before applying any new coating to ensure proper adhesion and compatibility.

Understanding Silicone Roof Coatings

Silicone roof coatings are liquid-applied membranes that create a seamless, flexible, and waterproof barrier over existing roofs. They are perfect for extending the life of your roof and adding extra protection against weather and UV damage. Silicone can be applied directly onto various roofing materials, including TPO, making it a versatile choice. The use of proper tools, such as rollers, brushes, or sprayers, is essential for achieving an even and effective application. It is also important to use products specifically designed for compatibility with TPO and other roofing materials. Many roof coatings, including some silicone and acrylic options, are water based, which makes them easy to apply and environmentally friendly.

Pros of Silicone Roof Coatings

• Waterproof: Silicone coatings excel at preventing leaks caused by ponding water by creating a watertight barrier that prevents water intrusion. For roofs prone to standing water, this feature is particularly beneficial.

• UV Resistance: Similar to TPO, silicone coatings reflect sunlight. Research shows that they can reduce rooftop temperatures by as much as 20 degrees Fahrenheit, improving energy efficiency.

• Seamless Application: The lack of seams means there are fewer chances for leaks, making silicone a reliable choice for long-term protection.

• Low Maintenance: Silicone coatings resist mold, mildew, and staining. This means you’d need minimal upkeep, saving time and effort.

Cons of Silicone Roof Coatings

• Cost: Silicone coatings can be pricier upfront, typically costing $4 to $7 per square foot.

• Slippery When Wet: These roofs can become slippery during rain, which may require granules to be added for safety.

Can You Apply Silicone on TPO Roofing?

Yes, silicone can be applied directly onto TPO roofing. Coating TPO roofs is a suitable method for extending their lifespan and improving energy efficiency. This compatibility is beneficial for property owners wanting to boost the TPO’s lifespan and performance. However, adequate preparation is essential for the best results. The TPO surface must be clean and free of debris prior to coating application. Following the correct order of preparation steps—including cleaning, thoroughly rinsing the surface, and applying primer prior to coating—is crucial to ensure optimal adhesion and long-term performance.

The Application Process

1. Surface Cleaning: Start by cleaning the TPO thoroughly to remove dirt and oils. All roof surfaces should be thoroughly cleaned and prepared before coating. Using a power washer or a specialized cleaning solution can improve adhesion and performance.

2. Priming: A primer is typically recommended to enhance the bond between the silicone and the TPO. This step is critical for ensuring the coating lasts as long as possible, as the primer helps the silicone adhere properly to the TPO surface.

3. Application of Silicone: After cleaning and priming, begin applying the silicone as a coat using a roller or sprayer to ensure an even layer across the roof. A brush can be used to apply coating to seams, edges, and hard-to-reach areas for even coverage. Multiple coats may be necessary for optimal protection.

   *After applying the first coat, allow it to dry completely before applying the second coat. Applying two coats at right angles is recommended for maximum durability and coverage.

4. Curing: Allow the coating to dry and cure according to the manufacturer’s instructions. High humidity can extend curing times and may affect the final performance of the coating. Ensuring the coating dries to the recommended thickness is essential for optimal performance, durability, and UV protection. Proper curing is necessary for achieving optimal waterproofing.

   
   

Advantages of Combining Silicone with TPO

Adding a silicone coating over TPO provides several benefits:

• Extended Lifespan: A silicone layer protects the TPO from UV rays and water damage, helping it last longer. The silicone coating is resistant to weathering and provides durable protection against environmental factors, ensuring the roof maintains its performance over time.

• Improved Energy Efficiency: The reflective properties of silicone can further reduce cooling costs. Even coverage of the silicone coating ensures the entire TPO surface is properly coated for maximum benefit and long-lasting results.

• Seamless Protection: The elimination of seams means fewer risks for leaks, an essential feature in roof durability.

Making the Right Choice for Your Roof

Deciding between TPO roofing and silicone roof coatings can be tricky. Having the right knowledge about roof coatings and understanding the details of each option is crucial for a successful project. Here are some factors to guide you:

Climate Considerations

St. George experiences intense sun and heat. Both TPO and silicone offer UV resistance, but TPO can especially lower cooling costs due to its high reflectivity.

Roof Condition and Existing Roofing Material

If you are starting fresh, TPO roofing may be the best choice. TPO, EPDM, and metal roofs each have unique coating requirements, and coatings are also commonly used on trailers and RVs. If you have an existing roof needing upgrades, silicone coatings bring new life without a complete tear-off.

Budget

Cost matters. TPO roofing systems are often the cheaper choice initially. However, silicone coatings can save you money on long-term maintenance and energy costs. Weigh your budget against potential long-term savings. Customers should carefully consider both upfront and long-term costs when choosing a roofing solution.

Maintenance and Longevity

For those who want a roof that requires little upkeep, silicone coatings win. They resist mold and algae, allowing you to focus on other property needs.

Roofing Membrane Like Liquid Rubber: Final Thoughts

Both TPO roofs and silicone roof coatings offer unique advantages to protect your property in St. George, Utah. When deciding between these options, consider factors such as energy efficiency, local weather conditions, roof type, existing previous coat or membrane, budget constraints, and maintenance requirements.

TPO roofs are known for their durability and cost-effectiveness, while silicone roof coatings provide a seamless, flexible barrier that excels in resisting ponding water and UV damage. Applying two coats—a durable first coat followed by a protective second coat—ensures optimal performance and longevity.

In areas of high humidity or where extreme temperature swings are common, both roofing options perform well but require proper application and regular upkeep. Additionally, silicone coatings can be selected in a color of your choosing to enhance your building’s aesthetics while protecting it from harsh sun exposure.

By carefully evaluating your roofing options, including your roof’s current condition and whether it has an existing previous coat, you can choose the best roof coating solution that fits your property’s needs and maximizes protection for years to come.

For a free consultation https://www.stgeorgeroofcoatings.com.