Decorative resin bound aggregate is a hard wearing, attractive porous tree pit surface. Loose stones are a nuisance in pedestrian environments - tarmacadam or conventional paving has the effect of creating an impervious cap over the tree pit. With DekorGrip Tree, the stone is bound together using a very high strength resin which prevents the gravel migrating beyond the tree pit. The nature of the resin bond results in a highly porous tree friendly surface immediately adjacent to the tree.