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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…
Solid floors are one of the more involved elements of a whole-building retrofit, and the approach taken here is designed around two principles: managing ground moisture without relying on a conventional damp proof membrane, and building a floor construction that…
Clay plaster is the preferred substrate for BTE’s internal wall insulation systems, and the reasons stack up across performance, embodied carbon, and practicality. The fundamental goal when fixing insulation boards to an existing wall is achieving full, continuous contact with…
The idea of introducing a ventilated cavity between internal wall insulation and the masonry surface is one that comes up regularly — and while it is recognised as an approach in some guidance, the strong preference here is to direct-bond…
In this episode of Can I Just Ask…, we answer a question that comes up again and again: do I need to insulate my window reveals? The short answer is yes — and here’s why. As you insulate a façade…
In this quick fire round of Can I Just Ask…, we rattle through four of the questions people ask most often about insulation. What’s the best type? How thick does it need to be? Can you install it yourself? And…
Chimneys are one of the most common yet overlooked sources of heat loss in older homes, and in a retrofit context almost every property will have at least one to deal with. Despite their cosy associations, an unaddressed chimney creates…
Mixing external and internal wall insulation on the same building is a question that comes up regularly — typically where a property has an attractive front elevation that the owner doesn’t want to clad, but plainer sides and rear that…
In this quick fire round of Can I Just Ask…, we tackle five of the most common wood fibre insulation questions in one go. Can it actually be recycled? How is it made — and what’s the difference between the…
When retrofitting older buildings, one of the big challenges is reducing heat loss through solid masonry walls without creating moisture problems. Adding internal wall insulation (IWI) helps with energy efficiency — but it can also trap moisture inside the masonry,…
The default position for OSB in a timber frame wall is on the outside of the frame — it’s simply easier for timber framers to work with during construction, giving them a continuous external surface for membranes and wall ties.…
There are two main methods of moisture analysis used in UK building projects, and choosing the wrong one for the application can lead to seriously misleading results. The simpler and more widely used method is the Glaser analysis, governed by…