Rooftop Meadow Grass B - Horizon

This is a B-horizon on-slab mix to be installed in association with Specification S19 – Rooftop Meadowgrass Media.

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Description

Specification - S19a. Rooftop Meadowgrass B-horizon


Part A: “Fit-for-purpose” Performance Description

This is a B-horizon on-slab mix to be installed in association with Specification S19 – Rooftop Meadowgrass Media.

This is a highly permeable, low nutrient and very low organic matter product.


Part B: Product Specification (Technical parameters)

Analysis



Physical

B.D. (Kg/l @ 16 drops)

kg/l

1.44

 
B.D (Predicted Ksat)

kg/l

1.75

 
Sat Hyd Cond(Deff)(mm/hr)

mm/hr

337

 
Total Porosity (%v/v)

%v/v

34

 
Water-filled Porosity %v/v

%v/v

12

 
Air-filled Porosity (%v/v)

%v/v

22

 






Chemical

pH in water

pH Units

6.0-6.5

 






Particle Size Analysis

>3.35mm

%

0.1

 
2.0-3.35mm

%

0.4

 
1.0-2.0mm

%

1.2

 
0.50-1.0mm

%

12.3

 
0.25-0.50mm

%

54.7

 
0.15-0.25mm

%

17.8

 
0.106-0.15mm

%

4.2

 
0.053-0.106mm

%

2.9

 
0.02-0.053mm

%

2.1

 
0.002-0.02mm

%

1.0

 
<0.002mm

%

3.5

Performance Factors

Gradation Index (D90/D10)



7.39

 
Coefficient of Uniformity



4.86

 
Fineness Modulus



1.6

D Values

D100:



3.688

 
D90:



0.659

 
D85:



0.495

 
D60:



0.381

 
D50:



0.335

 
D35:



0.266

 
D30:



0.242

 
D25:



0.214

 
D15:



0.158

 
D10:



0.112

 
D5:



0.028



Part C: Components

This formulation requires washed and specifically graded mineral components in order to meet the D Values specified. Lack of adherence to this may result in unacceptable slumping and compaction of time.

This product may be installed to a depth of 500mm where a B-horizon installation is designed. This is not a low density soil. Consideration must be given to structural capacity to support the load.