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Roof Garden Substrates
Intensive Subsoil

Intensive Subsoil

Lightweight Subsoil

A Lightweight Subsoil designed to compliment our Intensive Lightweight Topsoil for roof and podium planting.


Although not mentioned in the FLL guidelines, we developed a Lightweight Subsoil to aid our client looking to install subsoil on a roof or podium planting scheme. The material simply uses our standard Free Draining Subsoil, blend with Expanded Clay Aggregate to help bring the bulk density down from approx. 1,800kg per cubic metre to 1,400kg.

Technical Data

Organic Matter: <0.5% (LOI)
SHC Rate: 504 mm/hr
Bulk Density: 1.36 g/cm³
Total Porosity: 40%


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