Sta-Kool 770 Cool Roof Elastomeric Coating is a durable, white reflective coating designed to extend roof life, reduce energy costs, and provide a weather-tight seal for low-slope roofs. This 5-gallon product is formulated to form a flexible membrane that resists cracking and UV damage while maintaining color and performance in hot climates. It is suitable for various roofing substrates, including built-up roofs, modified bitumen, and single-ply systems, making it a popular choice for homeowners and contractors seeking a cost-effective cool roof solution.
Product Overview
Sta-Kool 770 is an elastomeric coating that dries to a highly flexible film, enabling it to bridge small cracks and accommodate roof movement. The coating is designed to reflect infrared radiation, helping to lower attic temperatures and reduce cooling loads. The 5-gallon container provides ample coverage for typical residential roofs, with coverage rates influenced by surface texture and porosity. A key feature is its compatibility with common roofing materials without aggressive odor or harsh solvents.
Coverage, Yield, And Material Compatibility
Typical coverage ranges from 40 to 80 square feet per gallon, depending on surface condition and desired thickness. Most homeowners achieve optimal results by applying two coats, which increases durability and reflective performance. Sta-Kool 770 adheres well to concrete, masonry, metal, built-up roofs, and some single-ply membranes, though it is essential to verify substrate compatibility before application. Proper surface preparation enhances adhesion and longevity of the coating.
Surface Preparation
Effective surface prep is critical for long-lasting performance. Steps include removing loose gravel from built-up roofs, cleaning debris, and repairing any noticeable damage. Surfaces should be clean, dry, and free of dirt, oil, or dust. For porous substrates, a light cleaning and dust-free surface is necessary. In some cases, priming or flood coats may be recommended to ensure consistent film formation and adhesion. Always follow the manufacturer’s technical data sheet for substrate-specific instructions.
Application Process
Apply Sta-Kool 770 with a brush, roller, or airless spray equipment suitable for elastomeric coatings. For best results, use a two-coat method with adequate wet-on-wet timing to prevent lap marks. Maintain even thickness to avoid pooling, which can lead to drainage issues and longer cure times. Temperature and humidity influence application and curing; perform coating during mild weather and avoid applying in extreme heat or imminent rain. Use protective equipment as recommended by the product data sheet.
Drying And Curing Times
Initial tack time typically occurs within a few hours, with full cure taking several days depending on ambient conditions. Cooler temperatures and higher humidity can extend curing times, while direct sun and warm conditions may accelerate drying. Avoid foot traffic or traffic on the coated surface until the film reaches sufficient hardness. The coating’s reflective properties develop as it cures, contributing to energy-saving benefits over the coated roof.
Don’t Overpay for Roofing Services – Call 877-801-4315 Now to Compare Local Quotes!
Benefits And Limitations
- Energy Savings: High reflectivity reduces heat transfer into the building, lowering cooling costs.
- Durability: Elastomeric film resists cracking and weathering, extending roof life.
- Versatility: Suitable for multiple roofing substrates with good adhesion.
- Ease of Use: Available in 5-gallon containers, compatible with standard applicators.
- Limitations: Requires proper surface prep and multiple coats; performance may vary with extreme climates or highly textured surfaces.
Safety, Storage, And Maintenance
Store in a cool, dry place away from direct sunlight and sources of heat. Use appropriate personal protective equipment when applying, including gloves and eye protection. Ensure adequate ventilation during application and curing. Regular roof inspections after severe weather help identify any coating wear or damage that may require touch-ups or re-coating to maintain performance.
Cost Considerations And Value
Pricing varies by supplier, location, and quantity, but a 5-gallon pail generally offers a cost-effective solution for medium-sized roofs. When calculating value, consider the extended roof life, potential energy savings, and reduced maintenance expenses over time. Compare Sta-Kool 770 with other elastomeric coatings to determine the best match for climate, roof type, and budget.
Frequently Asked Questions
- Can Sta-Kool 770 be applied to metal roofs? Yes, with proper surface preparation and adhesion tests.
- Is two coats recommended? Yes, applying two coats typically yields better durability and reflectivity.
- What temperatures are suitable for application? Mild temperatures within the product’s specified range are advised; avoid extreme heat or cold.
- Does it require a primer? Primers are not always required, but consult the technical data sheet for substrate-specific guidance.