BRINGING OLD-WORLD EUROPEAN CRAFTSMANSHIPO TO MORDERN DAY AMERICA LEGACY METHOD Patios, Drives, and Pool Decks
Aspect
Concrete Slab Base
Crushed Rock Base
HPO’s Trass System
~5,000 psi ; bonded, permeable slab-like Up to 40-ton rating ; handles heavy traffic
3,000–4,000 psi; rigid but cracks under stress Strong initially; brittle failure if cracked Impermeable; water trapped beneath Vulnerable; cracks common Mirrors soil movement; cracks Difficult; cutting and patching
Relies on compaction; no true beam strength Adequate for patios; thick base for vehicles Semi-permeable; dense base holds water Moderate; dense base freezes and heaves Requires extra prep and geogrid Moderate; re-sand, re- level
Structural Strength
Load Capacity
Highly permeable ; rapid drainage through layer Excellent ; tested through 50 cycles with zero Bridges minor soil shifts; keeps clay dry
Handling of Water
Freeze-Thaw Resilience
Clay Soil Adaptability
Minimal ; stays level, joints sealed
Maintenance
Built-in lime neutralization
Efflorescence Control
Low
Low
30–50+ years , warranty- backed
Expected Lifespan
10–20 years
10–15 years
BENEFITS OF THE LEGACY METHOD BY HIGH PRAIRIE
Ultra-Durable- Withstands traffic up to 40 tons. More durable than concrete or aggregate. Permeable- No standing water, ugly drains, and total water management Frost Resistant- Doesn’t crack or heave due to our clay soils and frost Low Thermal Shock- Does not expand or contract due to our KC temperature fluctuations Pozzolanic Properties: Trass is a natural pozzolan, meaning it reacts with calcium hydroxide in the presence of moisture to form a binding material. This reaction can improve the longevity and stability of the bedding over time, almost like a “self-healing” effect for small cracks or gaps. Efflorescence Resistance: Trass is naturally resistant to efflorescence, the chalky white deposits that can appear on concrete due to water drawing minerals to the surface. This helps maintain a clean, even appearance over time.
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