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Moisture performance of an airtight, vapor-permeable building envelope in a cold climate

Simonson, C. J., Ojanen, T. and Salonvaaray, M.
2005
, Journal of THERMAL ENV. & BLDG. SCI., Vol. 28, No. 3

Simonson, C. J., Ojanen, T. and Salonvaaray, M., (2005), "Moisture performance of an airtight, vapor-permeable building envelope in a cold climate", , Journal of THERMAL ENV. & BLDG. SCI., Vol. 28, No. 3.
Abstract:
Vapor-permeable building envelopes have received renewed interest because they can moderate indoor humidity levels and improve the drying of the envelope during summer condensation conditions. In this paper, the moisture performance of a vapor-permeable building envelope is presented with field measurements and numerical simulations. The results show that the diffusion resistance of the internal surface should be greater than that of the external surface (typically recommended ratio of 3 : 1 or 5 : 1), but that the vapor resistance of the vapor retarder can be significantly below that provided by polyethylene and still result in a safe structure, even in a cold climate.

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Author Information and Other Publications Notes
Simonson, C. J.
  1. An experimental data set for benchmarking 1-D, transient heat and moisture transfer models of hygroscopic building materials. Part II: Experimental, numerical and analytical data
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  3. Heat and mass transfer between indoor air and a permeable and hygroscopic building envelope: part I -- field measurements
  4. Heat and mass transfer between indoor air and a permeable and hygroscopic building envelope: part II --verification and numerical studies
  5. Improving indoor climate and comfort with wooden structures
  6. Integration of simplified drying tests and numerical simulation in moisture performance analysis of the building envelope
  7. Measuring and modeling vapor boundary layer growth during transient diffusion heat and moisture transfer in cellulose insulation
  8. Moisture buffering capacity of hygroscopic building materials: Experimental facilities and energy impact
  9. Moisture, thermal and ventilation performance of Tapanila ecological house  
Ojanen, T.
Tiiomo Ojanen Senior research scientist VTT Building Technology, Finland.
  1. Drying capabilities of wood frame walls with wood siding
  2. Effect of exfiltration on the hygrothermal behaviour of a residential wall assembly: results from calculations and computer simulations
  3. Heat and mass transfer between indoor air and a permeable and hygroscopic building envelope: part I -- field measurements
  4. Heat and mass transfer between indoor air and a permeable and hygroscopic building envelope: part II --verification and numerical studies
  5. Improving indoor climate and comfort with wooden structures
  6. Improving the drying efficiency of timber frame walls in cold climates, by using exterior insulation
  7. Integration of simplified drying tests and numerical simulation in moisture performance analysis of the building envelope
  8. Measuring and modeling vapor boundary layer growth during transient diffusion heat and moisture transfer in cellulose insulation
  9. Modeling heat, air and moisture transport through building materials and components
  10. Moisture and bio-deterioration risk of building materials and structuresL?hdesm?ki
  11. Moisture buffer value of building materials
  12. Moisture Buffer Value of Materials in Buildings
  13. Moisture transport coefficient of pine from gamma ray absorption measurements
  14. Numerical simulation of mould growth in timber frame walls
  15. Thermal and moisture performance of a sealed cold-roof system with a vapor-permeable underlay
  16. Towards modelling of decay risk of wooden materials  
Salonvaaray, M.
     


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