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NatureWall is now HolzCore – see the HolzCore system page After over 6 years of developing and honing the specification and the components within the HolzCore internal wall insulation system and 18 months of to-and-fro with KIWA, we are really…
We scour the markets looking for new and innovative products and whilst we find some in the UK, quite often they lack the testing and technical documentation required for us to incorporate them in to our specifications. Thankfully, that has…
It’s a question that keeps coming up, and understandably so. When you start talking about internal wall insulation (IWI), moisture risk is never far behind. Somewhere along the line, the idea has taken hold that introducing a ventilated cavity between…
Retrofit projects often throw up variable specifications — sometimes something’s already been installed and you’re working around it, or there’s pressure to reduce overall build-up thickness. So can wood fibre insulation be combined with PIR or other synthetic insulations? In…
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…
Flat roofs are one of the most technically demanding roof types to get right, and the membrane you choose has a bigger impact on long-term performance than most people realise. In this episode of Can I Just Ask?, Chris and…
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…
Overheating in well-insulated homes is a growing issue in the UK, and one that catches many homeowners and builders off guard. As the climate shifts and sharp heat events become more frequent, the assumption that good insulation equals a comfortable…
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…
In this episode of Can I Just Ask…, we take on a question we hear a lot from people using natural materials: does wood fibre internal wall insulation improve indoor air quality? The honest answer is indirectly, yes — but…