Earthkweek makes modules from expanded cork, as an alternative to plastic trays. Made from the waste material of cork stopper production. This application of the cork green roof is a test set-up in which Dutch wool, currently a waste product, is tested as an aggregate of the earth mixture (substrate). Sheep’s wool can keep the other ingredients (compost and tiling) airy. The wool can also buffer water and slowly decays, releasing nutrients for the plants growing in the substrate.
