Earthlite™ Green Roof Media

 

Earthlite™ Extensive Growing media

Earthlite™ extensive is an engineered growing media designed for extensive green roof applications. Extensive green roofs have a typical depth of 3 to 6 inches with a saturated weight of 15 to 30 pounds per square foot.  Earthlite™ extensive roof media is an ideal growing media for drought-tolerant plants in a low/no maintenance setting. This mixture will provide an attractive natural environment that will function without the need for supplemental irrigation. Earthlite™ extensive provides a protective cover for the building by using the natural elements of sun, wind and rain to sustain itself.

While 2”-4” depth will support hardy succulents like Sedum and Delosperma species, a depth of 5” or more will also support other hardy perennials and grasses.

Earthlite™ Extensive Specifications

This media is a mixture of Earthliteexpanded lightweight aggregate, Axis® calcined diatomaceous earth, and an STA approved organic content complying with the following requirements:

Granulometric distribution

–         passing  US # 100     (d=0.15 mm)                                < 20 mass %
–         passing  US #  50      (d=0.30 mm)                            5 –  30 mass %
–         passing  US #  30      (d=0.60 mm)                          20 –  45 mass %
–         passing  US #  16      (d=1.18 mm)                          30 –  60 mass %
–         passing  US #   8       (d=2.36 mm)                          50 –  80 mass %
–         passing  US #   4       (d=4.75 mm)                          65 –  95 mass %
–         passing  US    3/8      (d=9.50 mm)                         95 – 100 mass %
–          proportion of slurry-forming components                       < 15 mass %

(d < 0.063 mm)

Apparent density (volume weight)

–          when dry                                                                   (46 lb/ft3)**
–          at maximum water capacity                                        (60 lb/ft3)**

Water and air management

–    maximum water-holding capacity                                  > 35% Vol.%
–    air content at maximum water capacity                         > 10% Vol.%
–    water permeability (saturated hydraulic conductivity)> 0.0236 in/min

pH value, salt content

–          pH value (in CaCl2)                                                     6.5 – 8.0
–          salt content (water extract)                                        < 3.5 g/l
–          salt content (gypsum extract)                                    < 2.5 g/l

Organic substances

–     organic content                                                              < 8.0 mass %

 

Nutrients

–          Nutrients available to plants
–          Nitrogen /N) (in CaCl2)                                              < 80 mg/l
–          Phosphorus (P2O5) (in CAL)                                      < 200 mg/l
–          Potash (K2O) (in KAL)                                              < 700 mg/l
–          Magnesium (Mg) (in CaCl2)                                       < 160 mg/l

Additional requirements

–          absence of any phytotoxic substances
–          absence of foreign substances
–          fire resistance
–          frost resistance

**  Values may vary depending on regional availability of components


 

 

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