IKO T-O Venting Layer is a glass fibre based perforated venting underlay, finished with sand surfacing on the topside and a polyethylene film on the reverse.  IKO T-O Venting Layer is specifically designed for use with torch applied roofing membranes and when used as the first layer of a torch applied built up felt roofing system, will provide a positive partial bond to prepared non-combustible substrates. Manufactured with an oxidised bitumen coating, IKO T-O Venting Layer can be used in conjunction with both SBS and APP modified torch-on roofing Application Torch-on roofing membranes should be installed in accordance with BS 8217: 2005, Code of Practice for Reinforced bitumen membranes for roofing, and to IKO recommendations. The application should follow the recommended good practices for torch-applied membranes. Care must be taken when applying torch-on in close proximity to combustible materials,  decorative coatings and heat sensitive materials. Apply torch-on roofing by melting the heat dispersible backing and coating to create a molten flow in front of the roll. The flame of the torch should be applied at the low point where the roll meets the underlay. As the film and bitumen melts, roll the roofing forward. NB. A bead of bitumen must exude from all lap joints to ensure a seal. Features Polyester or glass fibre base options. High softening point bitumen coating. Durable performance. Strong and flexible. Torch application. Easily detailed. 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.