DS EN 14318-1:2013 Thermal Insulating Products For Buildings - In-Situ Formed Dispensed Rigid Polyurethane (Pur) And Polyisocyanurate (Pir) Foam Products - Part 1: Specification For The Rigid Foam Dispensed System Before Installation Defines requirements for in-situ formed dispensed rigid polyurethane (PUR) and rigid polyisocyanurate (PIR) foam products when installed into cavity walls.