Watch our step-by-step guide on how to install Eternit FarmTec two-piece close fitting and vented ridges Eternit FarmTec sheeting is specifically designed for British farmers and our unique climate. Building a new shed roof is a long-term investment in the productivity and health of your business. We work side-by-side with our farmers and are committed to growing and investing in their potential — equipping them with ever smarter solutions to grow their farms, and meet the needs of their future. Fibre cement profiled sheeting, Corrugated roofing sheets. Agricultural roofing.