Excavated earth and fill materials

BS8601 free-draining subsoil with a sand content of 95%.

Extensive Substrate (A20703/1) is a lightweight, well-draining growing medium designed for green roof applications. It has a high total porosity of 54.2%, ensuring effective moisture retention and aeration while preventing waterlogging.The bulk density ranges from 0.88 g/cc when oven-dried to 1.25 g/cc at field capacity, indicating a lightweight structure that reduces roof load. Its saturated hydraulic conductivity of 18.1 mm/min supports efficient drainage, while a field capacity of 36.8% ensures water availability for plant growth. The pH of 8.1 is slightly alkaline, making it suitable for drought-tolerant vegetation.With a C:N ratio of 8.10 and adequate macronutrient levels of phosphorus and potassium, this substrate provides a stable and nutrient-balanced environment for extensive green roofs.Stones (>8 mm): 61.8%.

Washed sand subsoil.

BS 8601 Subsoil.

Bioretention soild for use within Sustainable Drainage Systems (SuDS).

SuDS sand subsoil.

Free draining subsoil.

Intensive lightweight subsoil.

Intensive lightweight washed sand subsoil.