Home / Games / Detail Master: Cold Bridge
🧊 Detail Master: Cold Bridge
Same materials, same thicknesses, same U-value — and yet one stacking order gives you a dry roof and the other rots the structure from inside. Reorder the layers and watch where the temperature gradient actually falls. The goal is not a better U-value; it's keeping the concrete deck on the warm side of the insulation.
Layers (inside → outside)
Use ↑ / ↓ to reorder. Interior 20°C, exterior −5°C.
Live Result
—
U-value (W/m²K)
—
Concrete Deck Temp (°C)
🎯 Goal: keep the concrete deck above 10°C — comfortably clear of dew-point condensation risk.
This game runs the exact ISO 6946 calculation
(engine/envelope-thermal.js), verified before publishing —
including the counterintuitive result the game is built around: reordering the
layers leaves the U-value bit-for-bit identical (series resistances
commute) while swinging the deck temperature from 18.7°C to −3.8°C. The
10°C target here is a deliberately simplified stand-in for a proper dew-point
check (which needs interior humidity, not just temperature) — the real
Glaser-method condensation analysis is out of scope for this game.
Method
ISO 6946U = 1/(Rsi + Σ(t/λ) + Rse); Rsi=0.10, Rse=0.04 for upward heat flow (roofs), Table 7.
GradientΔT across each layer = (R_layer/R_total)·(T_in − T_out) — the reason layer order governs condensation risk.