Model a wall, roof, or floor assembly and see the steady-state temperature and vapour-pressure profile update in real time, flagging any interface where interstitial condensation risk exists.
BUILDING PHYSICS TOOL
Enter indoor and outdoor conditions, build the assembly from indoor to outdoor face, and the diagram and interface table below recalculate instantly. This is a screening tool for a single steady-state condition — not a substitute for a full hygrothermal (WUFI-style) assessment where seasonal drying, material moisture storage, or driving rain are relevant.
Indoor and outdoor temperature and relative humidity drive the whole profile.
Drag rows by the handle to reorder, or use the arrows. Enter conductivity (K) + thickness, or type an R value directly to override — the field turns olive once overridden. Same logic applies to permeability (μ) vs. permeance (M).
| Material | K (W/m·K) | Thick. (mm) | R (m²K/W) | μ (ng/s·Pa·m) | M (ng/s·Pa·m²) |
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X-axis: location through the assembly, indoor face (left) to outdoor face (right). Left axis: vapour pressure. Right axis: relative humidity — the shaded band marks where actual pressure meets or exceeds saturation.
| # | Boundary | Location (mm) | Temp (°C) | Pv (Pa) | Psat (Pa) | RH (%) | Status |
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