Official Trade Association representing installers and manufacturers/system designers of Insulation measures which include...Internal Wall Insulation (IWI), External Wall Insulation (EWI), Hybrid Solid Wall Solutions, Cavity Wall and Loft Insulation plus Draught Proofing solutions. NIA members abide by a strict Code of Professional Practice and have to meet our stringent criteria of membership offering peace of mind for consumers, specifiers, Local Authorities and industry stakeholders. Visit our website to find a list of our approved members, membership information, case studies and useful FAQ's.