Saint Louis Zoo Primate House Outdoor Expansion

April 29, 2021

St. Louis Zoo – Primate Canopy Trails: Engineering Clarity, Safety, and Immersion

On May 22, 2019, the Saint Louis Zoo debuted its plans for the creation of Primate Canopy Trails, an $11.5 million, 35,000-square-foot outdoor expansion of the Primate House. Construction for Primate Canopy Trails is underway and is scheduled to open to the public in 2021. Primate Canopy Trails will consist of eight new outdoor homes for primates — lemurs, Old World monkeys and New World monkeys — adjacent to the Primate House.

St Louis Zoo Animal Enclosure by JEI Structural Engineering

JEI Structural Engineers designed the glass on this animal enclosure. 

For a Free quote call 816-505-0987 or email Info@JEIstructural.com

When the St. Louis Zoo unveiled its award-winning Primate Canopy Trails, visitors gained a unique opportunity to step into the treetops and experience primates in motion as never before. Behind the lush landscapes and playful monkeys, however, lies a carefully engineered balance of safety, visibility, and durability — the invisible work of structural glass and glazing design.

The Challenge: Safe, Close Encounters

Primate exhibits present distinct challenges for glazing systems:

  • Dynamic Movement: Primates swing, climb, and jump with speed and strength, creating unpredictable impact loads.

  • Projectile Behavior: Rocks, sticks, and enrichment items may be thrown against glass.

  • Clarity & Experience: Visitors expect crystal-clear views without distractions from scratches or cloudy acrylic.

  • Durability: Outdoor exposure requires resistance to weather, temperature fluctuations, and long-term wear.

The zoo’s goal was to immerse visitors in the primate environment while ensuring the safety of both animals and guests.

Our Engineering Solution

JEI Structural provided specialized glazing design and drafting services tailored to the Primate Canopy Trails:

  • Glass vs. Acrylic Evaluation

    • Analyzed performance trade-offs between acrylic and laminated glass.

    • Recommended glass in key visitor areas to resist scratching and maintain clarity.

  • Impact Resistance Calculations

    • Considered primate speed, weight, and dynamic impact loads.

    • Accounted for foreign object risks, such as rocks or enrichment toys being thrown at the panels.

  • Custom Glass Makeup

    • Developed laminated glass systems using multiple plies with high-performance interlayers.

    • Optimized thickness for safety factors (SF4 vs. SF10) in line with GANA and ASTM recommendations.

  • Detailing & Drafting

    • Produced shop drawings that coordinated with enclosure architecture.

    • Addressed sealant protection and edge support conditions to prevent tampering.

The Results

  • Immersive Visitor Experience: Guests now walk through elevated pathways and experience primates up close, with clear, unobstructed views behind high-performance glass.

  • Safety First: Structural glass panels resist both direct impacts and projectiles, ensuring safety without compromising design intent.

  • Durable Design: Glass and interlayer systems withstand outdoor exposure and daily zoo operations with long-term maintainability in mind.

Key Takeaway

The St. Louis Zoo’s Primate Canopy Trails is more than an exhibit — it’s a model of how engineering, architecture, and animal science come together. By addressing the “what ifs” of primate behavior, JEI Structural delivered glazing systems that are as safe and resilient as they are transparent.

At JEI Structural, we believe behind every amazing zoo encounter is smart engineering.

📞 Contact JEI Structural to learn more about our zoo and aquarium glazing expertise: 815-505-0987 | 🌐 www.jeistructural.com

 

 

 

 

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