Building physicist in Helsinki. Notes on insulation, moisture and heating that actually survive a Finnish winter.
Three winters of blower-door data from the same row of 1970s houses in Vantaa. The leaks cluster almost entirely around ceiling penetrations — and the usual advice about wall detailing turns out to matter far less than anyone tells you. Read →
I logged one system for 22 months before and after a second borehole was drilled. The seasonal COP moved from 3.1 to 3.4 — real, but nowhere near the payback the installer projected. Read →
Eight humidity sensors, a bag of silicone and about €140 — enough to see moisture moving through a wall assembly in real time instead of guessing from a single indoor reading. Read →
What changed for renovations specifically, and which of the new U-value targets are genuinely reachable in an old brick building without gutting it. Read →