U6 – Building Physics / Sustainability

U6 – Session 5:
Humidity Transfer

U6 – Building Physics and SustainabilityObjectives:

  • humidity transfer (capillary, convective, liquid) and methods to prevent problems caused by excess humidity
  • influence of wind and air tightness on humidity transfer
  • the influence of physical characteristics and their succession of materials (λ [Lambda], ρ [Rho], μ [My], w, w₂₄)
  • the conditions for mould growth (temperature, moisture, time of exposition)
  • humidity input by driving rain / driving snow on surfaces (w1, w₂₄)
  • flooding inside (leakages) or outside (surface water on slopes at excessive rainfalls or rivers and lakes overflowing)
  • input of humidity by building materials like green wood, pavements, plasters, concrete basement, …
  • input of water by plaster/rendering or pavements and walls per m² which has to be dried out during building process
  • w1, w₂₄ as to bad storage conditions straw might drop into water on ground (better sort that bales out)


  • lectures, exercises, workshop, group work


  • lectures, charts, presentations …


  • explain protection measures of building site with straw from storage to rising walls until rendering is finished and dried
  • measuring humidity in straw bales with different tools
  • know about drying out (desiccating) time of different materials for plastering on straw per cm layer in average summer climate

Materials/Documents: U6 S5 – Session Plan

Training Time: 3–4 hours