Sika Thorolastic®-850
Short Description
Sika Thorolastic®-850 is a silicone-modified, elastomeric waterproof coating designed for above-grade exterior surfaces. With superior crack-bridging ability (700% elongation), CO₂ diffusion resistance, and wind-driven rain protection, it ensures long-term durability and weather resistance. Ideal for stucco, brick, concrete, CMU, EIFS, and existing coatings.
Sika Thorolastic®-850 is a high-performance, water-based elastomeric coating formulated with silicone-modified acrylic technology for exceptional waterproofing and anti-carbonation protection. Designed for above-grade exterior surfaces, it offers unparalleled flexibility, allowing it to bridge dynamic cracks while maintaining superior adhesion and durability.
With a total elongation of 700%, Sika Thorolastic®-850 provides long-lasting protection against water penetration, wind-driven rain, and environmental exposure. It also serves as an effective CO₂ diffusion barrier, preventing carbonation-induced corrosion of embedded steel in concrete structures.
Key Benefits of Sika Thorolastic®-850:
- High elongation (784%) for crack bridging and superior flexibility
- Silicone-modified for enhanced waterproofing and weather resistance
- Breathable design prevents moisture entrapment while allowing vapor transmission
- Wind-driven rain resistance up to 98 mph (TT-C-555B certified)
- Effective CO₂ diffusion barrier to protect embedded steel from corrosion
- UV-resistant for excellent color retention and long-lasting aesthetics
- Excellent adhesion to stucco, brick, concrete, CMU, EIFS, and existing coatings
- Low-VOC and environmentally compliant
Common Applications:
- Building facades and exterior walls
- Concrete and stucco waterproofing
- EIFS and CMU protection
- Commercial and industrial exterior wall coatings
- Above-grade vertical surfaces
💡 Available in 5-gallon (18.93 L) pails, with an 18-month shelf life when stored properly.
