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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 light weight subsoil to aid our client looking to install subsoil on a roof or podium planting scheme. The material is simply uses our standard free draining subsoil, blend with expanded clay pellets to help bring the density down from approx. 1,400kg per cubic metre to 1,000kg.

Technical Data

Permeability: 234 mm/hr
pH: 7.5
Bulk Density: 1.57 mg/m
Total Porosity: 38 %
Organic Matter : <0.5 %


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