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The short answer to whether wood fibre insulation can be applied to wet walls is no — and understanding why matters as much as the answer itself. Wood fibre does genuinely useful things with moisture: it buffers it, redistributes it,…
In this episode of Can I Just Ask…, we tackle a question we hear almost daily from people planning internal wall insulation: can I use my parge coat as my airtightness layer? A parge coat or levelling plaster can be…
The range of membranes available for building fabric applications can look bewildering from the outside, but each one exists because a specific set of conditions demands something that the others can’t reliably provide. At the most fundamental level, membranes divide…
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…
Decrement delay describes the way a building’s fabric slows and reduces the transfer of heat from the outside to the inside — and it’s becoming an increasingly important concept as summer overheating replaces winter heat loss as the more pressing…
Roof U-value targets sit in a slightly different context to wall targets, for a couple of reasons. The regulatory starting point for an existing roof being improved without changing the rafters is 0.35 W/m²K — a threshold that’s achievable with…
Psi values — written as the Greek letter ψ — are a measure of linear heat loss at junctions: the additional heat that escapes specifically at the edges and corners of a building, around window apertures, at floor-wall connections, and…