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Guides and articles covering airtightness in insulation systems, including membranes, tapes and detailing for high-performance buildings.
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…
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…
Airtightness, breathability, and vapour control are three concepts that get conflated and confused in equal measure, and understanding how they interact is fundamental to designing a building fabric that performs well and doesn’t accumulate moisture damage over time. Airtightness means…
In this guide we look at suspended floor insulation using wood fibre insulation and how to correctly detail it so that you can be sure you will not get moisture or air leakage causing issues or damage. Before you start…
In this guide we look at how to install wood fibre loft insulation, whilst maintaining storage space above. We run through the steps to create an airtight, well insulated loft space that you can still use for storage. It is…
Here, using some simple 3d models, we look at how to insulate a pitched roof with wood fibre insulation. We start with installation from the exterior, which is our recommendation if possible, and move on to installation from the interior…
Find out more about how we approach this building scenario. What is air tightness? Air tightness essentially is a measure of how much air leaks out from the interior of a building when there is a pressure difference between the…