Blok-Lok: Redondo Union High School

Schools face constant exposure to the elements, and over time, water damage, staining, and deterioration can take a toll on their buildings. That’s why Redondo Union High School in Redondo Beach, CA took a proactive approach to preserving the integrity of its campus by applying Blok-Lok to its split-faced block exterior.

To ensure long-term durability and protection, contractor McMillin Painting Inc. chose Blok-Lok, a high-performance water repellent that helps prevent moisture intrusion, efflorescence, and surface deterioration while allowing the masonry to breathe naturally.

With its location near the coast, moisture, salt, and humidity pose a constant threat to the school’s buildings. Split-faced Block is especially vulnerable to water absorption, which can lead to staining, mold growth, efflorescence, and structural damage over time. Without the right protection, water can seep deep into the material, weakening it and accelerating deterioration.

• Deep-penetrating water repellent – Forms a breathable barrier to prevent water intrusion
• Prevents efflorescence & staining – Reduces salt deposits and unsightly white streaks
• UV & weather-resistant – Protects against sun exposure, rain, and coastal conditions
• Extends the life of masonry – Keeps split-faced block strong and durable
• Clear, natural finish – Preserves the original look of the building without altering color or texture

By applying Blok-Lok, Redondo Union High School has ensured that its historic campus remains well-protected for years to come. With enhanced durability and long-term moisture control, students and faculty can focus on learning—without worrying about the damaging effects of water and environmental exposure on their school’s buildings.