Lightweight, single size stone used in some Bauder drainage products to increase the compressive strength of the drainage layer build up.

This simple substrate provides a natural drainage method for green roof systems. In some systems the mineral drain product can be used without a plastic drainage layer. Additionally, it provides aeration qualities with some inherent water retention. Typically used as an infill with BauderGREEN DSE 40 and BauderGREEN DSE 60 products. The compressive strength of DSE 40 and DSE 60 are significantly increased when filled with SUB-MD UK.