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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…
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 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…