The Turbo Torch range of cap sheets and underlays has been specifically developed to provide the perfect combination of long term performance, ideal handling characteristics and rapid torch-on installation. The unique Turbo-Flow polymer modified bitumen coating melts faster with less gas/heat required, rapidly achieving optimum bond strength, and then cools quickly to reduce foot marking and slumping. Turbo Torch membranes are polyester based, with the specifically blended Turbo-Flow SBS polymer modified bitumen coating, ensuring high tensile strength, excellent low temperature flexibility and guaranteed long-term performance. Features High performance/rapid installation. Unique Turbo-Flow SBS modified bitumen coating. Quick Torch rapid dispersal backing film. Less heat (gas) required for installation. Reduced installation time (up to 30% faster). Ideal for detail work “ slate surfacing matches pour and roll cap sheets. Use with glass fibre based Universal Torch Underlay. Typical System Venting Layer. 2mm Underlay. 4mm Mineral Cap Sheet (Green, Blue Grey, Brown Etc). Replace Mineral Cap Sheet with 4mm Sanded if laying Promenade Tiles.