Tecnatorch SBS capsheets are high performance torch-on SBS elastomeric membranes with Grooves technology developed for use in high performance built-up systems on flat, pitched or curved roofs. Features of andersons roofing felt Unique patented grooves system. 30% faster application than traditional torch-on membranes. Technically advanced low heat-reactive bitumen. BBA Tested and Approved - Cert No. 07/4409. Lap security gives maximum resistance to wind uplift. Polyester reinforced. 15 year guarantee.