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Guides and articles covering internal wall insulation systems, including installation, moisture management and detailing for IWI projects.
In this video we look at what happens to internal wall insulation when a property floods. The real problem isn’t the water itself, it’s what the water brings in with it, and that changes what has to happen to the…
In this episode, Chris and Andy look at why positive input ventilation (PIV), despite being widely used in retrofit projects, generally isn’t recommended alongside internal wall insulation (IWI). Andy explains that PIV works by pressurising the indoor space to push…
Internal wall insulation is one of the most common retrofit interventions in the UK, but it’s also one of the most frequently misapplied. A November report from DESNZ highlighted a failure rate of around 30% in IWI installed under government…
PAS 2035 is the government-backed framework that sets out how retrofit projects in the UK should be planned, delivered, and overseen. Introduced to address the well-documented failures of earlier retrofit programmes, it establishes a structured process that runs from the…
The single most important principle when preparing a wall for internal wall insulation is achieving continuous contact between the back face of the insulation and the wall surface — no voids, no bridged gaps, no variable depths that leave sections…
Interstitial condensation is one of the most frequently raised concerns around internal wall insulation, and understanding what it actually is — and how it behaves differently depending on the materials used — is fundamental to designing a system that works…
One of the more practical concerns people have about internal wall insulation is what they can do with the surface afterwards — and the answer is more flexible than most expect. For both direct-plastered wood fibre systems and NatureWall, the…
NatureWall was developed to bring the performance benefits of wood fibre internal wall insulation into contexts where conventional wet-trade systems are impractical — larger schemes, commercial projects, or any situation where the priority is speed, mainstream contractor compatibility, and dry…
Fixing into internal wall insulation is something that’s best thought about before the installation goes in, not after. The ideal approach wherever possible is to reroute services and fixings away from external walls altogether — the less metal penetrating through…