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Boughton Biodiverse Green Roof Substrate

Verified by manufacturer 3 months ago

Boughton Loam

Biodiverse green roof substrate for projects which require a substrate that can support a wide range of plants at a relatively shallow depth.

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Application

Suitable for semi-intensive green roof installations requiring a substrate that can support a wide range of plants at a relatively shallow depth.

Description

The greater amount of sand particles in this substrate allows it to hold onto a greater volume of water compared to EX1, but still allow rapid drainage when required. Due to the greater sand content, this substrate is not suitable for very lightweight applications and is more suited for green roofs which are designed to support a more in-depth plant community such as wildflower meadows or intentionally sporadic biodiverse planting.


Designed specifically for semi-intensive green roofs, this substrate should be installed at a depth of 120–180 mm. It is perfectly suited for biodiverse roofs, which require substrate to be installed at varied depths across the structure in order to increase variability. 


Due to its relatively free draining nature, temporary irrigation may be required to assist plant establishment. However, permanent irrigation systems are generally not installed on semi-intensive roofs as this will cause excessive plant growth and encourage weed development in the long term.


Features and benefits:

  • Substrate density:
  • Bulk density when oven dried: 0.99 g/cm³.
  • Bulk density at 10% VMC: 1.08 g/cm³.
  • Bulk density at field capacity: 1.4 g/cm³.
  • Particle density: 1.38 g/cm³.
  • Water and air:
  • Field capacity: 40.0% v/v.
  • Total porosity: 71.9%.
  • Porosity at field capacity: 39.5%.
  • Effective porosity: 32.3%.
  • Saturated hydraulic conductivity: 151 mm/min.
  • Chemical:
  • Organic matter: 3.7%.
  • pH value: 8.2.
  • EC: 2.8 mS/cm.
  • Plant available nutrients:
  • Nitrogen: 12.3 mg/L.
  • Phosphate: >165 mg/L.
  • Potassium: >241 mg/L.
  • Particle size distribution:
  • Stones (>8 mm): 1.7%.
  • Coarse gravel (84 mm): 16%.
  • Fine gravel (42 mm): 2.6%.
  • Very coarse sand (21 mm): 7.4%.
  • Coarse sand (1.00.5 mm): 21.0%.
  • Medium sand (0.50.25 mm): 33.9%.
  • Fine sand (0.2500.125 mm): 13.2%.
  • Very fine sand (0.1250.050 mm): 0.6%.
  • Silt (0.0500.002 mm): 2.3%.
  • Clay (<0.002 mm): 1.4%.

General information

Color

Brown

Finish

Natural

Material

Soil

Shape

Formless

Uniclass

Pr_45_31_89_35 Green roof substratesPrimary
Pr_45_31_89_41 Imported growing media
Pr_45_31_89_50 Manufactured growing media

CAWS

Q28/125 Green roof growing media system

Q37/120 Simple intensive green roof

Specification data - Green roof substrates

General requirements

Topsoil, growing medium, subsoil and preparation materials generally.

Supplier

Boughton Loam.

Source

Manufacturer's standard.

pH (range)

8.2.

Organic matter content

2–5%.

Percentage of material smaller than 0.063 mm in size (by mass)

82.3%.

Percentage of material greater than 4.0 mm in size (by mass)

16%.

Percentage of material greater than 8.0 mm in size (by mass)

1.7%.

Maximum water holding capacity (by volume)

≥40%.

Water permeability

151 mm/min.

Sustainability data

Contains Red List materials

No

Country of material origin

Europe

Country of product manufacture

United Kingdom

Material

Soil

Manufacturing plant location

Recyclability

Fully Recyclable

Expected Life

Lifetime

Literature

Boughton Landscape Product Brochure

Boughton Landscape Product Brochure

Boughton Biodiverse Green Roof Substrate Spec Sheet

Boughton Biodiverse Green Roof Substrate Spec Sheet

Case studies

Wandsworth Riverside

Wandsworth Riverside

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