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Airtightness
Guides and articles covering airtightness in insulation systems, including membranes, tapes and detailing for high-performance buildings.
Can I use positive input ventilation with internal wall insulation? – Can I Just Ask? | Ep.45
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…
What roof covering should i use on my flat roof? – CIJA | Ep.44
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…
What retrofit details cause the most failures in practice? – CIJA? | Ep.43
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…
Can I use my parge coat as an airtightness layer? – CIJA? | Ep.37
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…
Why so many membranes? | Can I Just Ask? – Ep.36
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: How to Make It All Work Together? – CIJA? | Episode 4
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…
Suspended floor insulation – How to install wood fibre insulation
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…
How to install your wood fibre loft insulation
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…
How to insulate a pitched roof with wood fibre insulation
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…