needlepunch wool felt for the Green Roof industry are produced from 100% recycled fibers, affordable with high performance for protection and separation. A Green Roof is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproof membrane. It may also include additional layers such a as a root barrier, drainage and irrigation systems. BIT offers two styles for the Green Roof industry: Protective needlepunch felt: used for cushioning waterproofing membranes. 8oz. or 12 oz. felts are used as an underlayment for other protective layers such as drainage panels. 16 oz. felts are used when gravel or soil will be placed on top.