TRASS BEDDING High Prairie’s Signature Hardscapes High Prairie’s Signature Hardscapes A SMARTER FOUNDATION FOR MODERN HARDSCAPES: EUROPEAN-STYLE TRASS BEDDING
Criteria
Concrete Slab Base
Aggregate Base
HPO’s Trass System
~5,000 psi , permeable bonded matrix Rated for 40-ton vehicular loads High – integrated drainage layer with ~50% void space Excellent – 50-cycle freeze-thaw lab test: zero damage
3,000–4,000 psi; rigid but brittle under stress
None; relies on compaction
Structural Strength
Handles vehicles if thick/reinforced
Adequate for patios; deeper base for cars
Load Capacity
None; impervious slab traps water
Limited; sand bedding often clogs
Permeability
Poor; cracks common if water infiltrates
Moderate; dense bases heave when saturated
Freeze-Thaw Resistance
Bridges minor shifts; drains moisture to stabilize clay
Rigid; cracks when soil shifts
Flexible but prone to rutting
Behavior on Clay Soils
Permanent bonded joints – no washout or weeds
Mortar joints crack over time
Joint Stability
Sand joints wash out
Trass mineral binds lime → efflorescence eliminated
High; lime migration common
Efflorescence Risk
Moderate
High; formwork, curing, mortar-set
Moderate; compaction needed
Moderate-high; wet-on- wet bonded system
Installation Complexity
30–50+ years; 10-year system warranty ~30% less cement; reduces carbon footprint
10–20 years (freeze-thaw zones) High CO₂ (cement-heavy slab) Limited; impervious surface adds runoff & heat
10–15 years (settlement common)
Expected Lifespan
Environmental Impact
Neutral
Minor if designed as permeable
LEED & Sustainability
Supports LEED Credits:
www.highprairieoutdoors.com.com
6116 Johnson Dr. Mission, Ks. 66202
+816-398-2901
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