Terraxx is a dimpled sheet with a geotextile layer which acts as a surface layer. Usually used as a green roof external drainage layer which also protects the primary waterproofing applied to substrate prior. Laminated on to the dimpled sheet, a layer of compression-resistant permanent filtration geotextile prevents the dimple structure from being clogged up by sludge, thus guaranteeing optimum drainage in the long run. Terraxx is an external membrane that can be used vertically and horizontally. The membrane has an adhesive tape manufactured on one side to overlap and join to the next part of membrane.