Why not subscribe to our newsletter to hear about upcoming news and offers and get % off your first order? The standard thickness is mm (eps) suitable for mm hydronic heating pipes and has an r value of . sheets are . x . m for a coverage of . sheets per m. Will they provide a full written quote that itemises all of the parts used and the work undertaken? Have a think about the following questions and make sure you relay the answers to your heating engineer. Answer.