Our substrate is a blend of lightweight manufactured topsoil and lightweight aggregate.
The topsoil is manufactured from reclaimed sand and PAS 100 green waste compost and is certified to BS3882:2015 standards. The specially matured and graded recycled green waste compost provides optimal stability and minimal leaching for organic matter and nutrients. The topsoil is blended with carefully selected and graded lightweight expanded clay aggregate, sourced from the UK.
Our substrate provides good aeration and water holding properties and controlled fertility levels. It is simple to work with, lightweight, and offers guaranteed consistency throughout the green roof installation.