The greater amount of sand particles in this substrate allows it to hold onto a greater volume of water compared to EX 1, but still allows rapid drainage when required. Due to the greater sand content, this substrate is not suitable for very lightweight applications. It 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 120-180mm. It is perfectly suited for biodiverse roofs, which require substrate to be installed at varied depths across the structure in order to increase variability.

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