Risk assessment: Retrofitting wall insulation

The research assessed risks of moisture ingress into retrofitted wall insulation when the underlay is either absent or compromised by installation holes drilled through cladding. The project provided guidance for councils, installers and homeowners on a building’s suitability for retrofit and the best method to use.
Lead organisation
BRANZ Limited
Focus area
Quality
Start date
Status
Complete
Last updated 23 Apr 2026
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SR436 Linings-on retrofit insulation in weatherboard walls: Ensuring effective water management research report SR436 Linings-on retrofit insulation in weatherboard walls: Ensuring effective water management pdf / 1.2 MB download

About this programme

The research assessed risks of moisture ingress into retrofitted wall insulation when the underlay is either absent or compromised by installation holes drilled through cladding. The project provided guidance for councils, installers and homeowners on a building’s suitability for retrofit and the best method to use.