What a Thermal Image Proves — and What It Doesn’t
A thermal image gives you a ranking, not a measured value. Why it doesn't yield a U-value, how emissivity and colour scale distort results — and the four questions to ask of every image…
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Building physics, application and practice
Articles on insulating coatings, component cross-sections, substrate testing and cost-effectiveness – for businesses applying the product.
GEG Is Now GModG: What Applies to the Facade from 29 July 2026
Since 29 July 2026, Germany's Buildings Energy Act (GEG) is called the Buildings Renovation Act (GModG). Which sections were renumbered, what stays the same…
Read articleReading the Data Sheet: What V and W Classes Really Mean
DIN EN 1062-1 only classifies; the actual requirement sits in DIN 4108-3. Why V1 is good and W1 is bad, why the three limit…
Read articleSummer Thermal Performance: What DIN 4108-2 Requires
The solar gain index, the ranking of measures, and why west-facing windows are more critical than south-facing ones. A compliance issue, not a comfort…
Read articleInternal Insulation in Existing Buildings: What WTA Requires
With internal insulation, the wall sits on the cold side. Why that makes moisture verification to WTA 6-4 and 6-5 compulsory — and where…
Read articleWhat Emissivity Really Describes
Stefan-Boltzmann, Kirchhoff and the fourth power: what ε means, where a low emissivity demonstrably matters — and why colour tells you nothing about it.
Read articleThe Degree-Day Method: What the Calculation Can Do, and Where It Stops
Q = U · A · Gt · 24 / 1000 — the method behind every rough savings estimate, its five blind spots, and…
Read articleChecking the Substrate: What the Contractor Owes — and What They Don’t
Substrate testing is a VOB obligation, not an optional extra. Which checks are standard on site, which should be charged separately — and how…
Read articleWhy Mould Is Not Just a Heating Problem
It isn't room temperature that decides mould growth — it's the wall's surface temperature. Why the DIN 4108-2 threshold sits at 12.6 °C —…
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