Warmer drier healthier #1: Retrofitting insulation in weatherboard walls with linings on: Effective water management (2020)

Around half of all New Zealand houses have no insulation in their walls. Linings-on retrofits are possible by blowing insulation into the wall space, but in some cases, there will be no existing wall underlay. This poses a potential risk of water ingress. BRANZ has developed a proposed evaluation method to provide a level of confidence that this will not happen when retrofitting insulation into timber-framed walls.