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|colspan="2" style="text-align: right;|Digested fiber || || || || || || || || || || || || || || || 10%
|colspan="2" style="text-align: right;|Digested fiber || || || || || || || || || || || || || || || 10%
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{| class="wikitable"
!colspan="3" style="background:cyan; color:black"| Table 1: Recommended green roof growing medium parameter ranges|
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| Parameter || Extensive green roofs || Intensive green roofs
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| pH || 6.5 to 7.8 || 6.5 to 7.8
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| Nitrate-N (mg/L) || 1 to 4 || 2 to 32
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| Ammonium-N (mg/L) || 0.1 to 0.8 || 0.1 to 0.8
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| Nitrogen (total) (mg/L) || 2 to 8 || 2 to 32
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| Phosphorus (total) (mg/L) || 2 to 10 || 2 to 15
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| Potassium (mg/L) || 8 to 32 || 8 to 64
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| Calcium (mg/L) || 100 to 300 || 100 to 300
|-
| Magnesium || 10 to 80 || 10 to 80
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| Iron (mg/L) || 8 to 32 || 8 to 32
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| Manganese || 1 to 8 || 1 to 8
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| Boron (mg/L) || 0.04 to 0.6 || 0.04 to 0.6
|-
| Sodium (mg/L) || <20 || <20
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| Zinc (mg/L) || 1 to 10 || 1 to 10
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| Soluble salts (mmhos/cm) || 0.4 to 1.2 || 0.4 to 1.2
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| Sodium Absorption Ratio (SAR) || <2 || <2
|}
{| class="wikitable"
! !! !! !! !! Table 2: !! Example green roof media specifications !! !! !!
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| Parameter || || || || Specification
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| Noncapillary pore space at field capacity || || || || 155 (vol.)
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| Moisture content at field capacity || || || || 12% (vol.)
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| Maximum media water retention || || || || 30% (vol)
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| Alkalinity, CaCo3 equivalents || || || || 2.50%
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| Total organic matter by wet combustion || || || || 3-15% (dry wt.)
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| pH || || || || 6.5-8.0
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| Soluble Salts || || || || 6 mmhos/cm
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| Cation exchange capacity || || || || 10 meq/100g
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| Saturated hydraulic conductivity for single media assemblles || || || || 0.05 in/min
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| Clay fraction (2 micron) || || || || 0
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| Pct. Passing US#200 sieve (i.e., silt fraction) || || || || 5%
|-
| Pct. Passing US#60 sieve || || || || 10%
|-
| Pct. Passing US#18 sieve || || || || 5%-50%
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| Pct. Passing 1/8 inch sieve || || || || 20%-70%
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| Pct. Passing 3/8 inch sieve || || || || 75%-100%
|}
|}