Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
권호 표지

Hygroscopic Properties of Light-Frame Wall with Different Assemblies

  • Kim, Se-Jong (Major in Environmental Materials Science, College of Agriculture & Life Science, Seoul National University) ;
  • Park, Chun-Young (Major in Environmental Materials Science, College of Agriculture & Life Science, Seoul National University) ;
  • Lee, Jun-Jae (Major in Environmental Materials Science, College of Agriculture & Life Science, Seoul National University)
  • Received : 2005.07.18
  • Accepted : 2005.11.01
  • Published : 2006.03.25
Download PDF
⟨ Previous Next ⟩

Abstract

On purpose to reduce accumulated moisture and to prevent moisture condensation in a light-frame wall, thermal characteristics and moisture behaviors were investigated for four different wall assemblies; a) typical wall, b) addition of vapor retarder between the insulation and the gypsum board, c) addition of air gap for natural ventilation behind the siding, d) composition with b) and c). Each wall was tested under two climate conditions; 1) $20^{\circ}C$, 50% RH (indoor) and $30^{\circ}C$, 85% RH (outdoor), 2) $30^{\circ}C$, 85% RH (indoor) and $20^{\circ}C$, 50% RH (outdoor).The results showed that the typical wall assembly had poor resistance against moisture intrusion from the inside of building. Outdoor and indoor humidity caused the moisture condensations on the inside of the siding and the back surface of the sheathing respectively. The addition of a vapor retarder did not give significant improvement in preventing the moisture intrusion.

Keywords

Acknowledgement

Supported by : Seoul National University

References

  1. Cornick, S. and M. Z. Rousseau. 2003. Understanding the severity of climate loads for moisture- related design of walls. Building Science Insight 2003 Proceedings. National Research Council Canada. NRCC 46775: 1- 13
  2. Hyland, R. W. and A. Wexler. 1983b. Formulations for the thermodynamic properties of the saturated phases of H20 from 173.15 K to 473.15 K. ASHRAE Transactions 89(2A): 500 - 519
  3. Rousseau, M. Z. 2003. Heat, air and moisture control strategies for managing condensation in walls. Building Science Insight 2003 Proceedings. National Research Council Canada. NRCC 46734: 1-11
  4. Sherwood, G. E. 1985. Condensation potential in high thermal performance walls-hot, humid summer climate. Res. Pap. FPL 455. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 21p
  5. TenWolde, A., C. G. Carll, and V. Malinauskas. 1998. Air pressures in wood frame walls. Proceedings of Thermal Performance of the Exterior Envelopes of Buildings VII. Fl, USA. pp. 665-675