Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Measurement of Through-Assembly Air Leakage and Its Impact on Moisture Performance of Wood-Frame Walls
https://orcid.org/http://orcid.org/0000-0002-7102-7345
https://orcid.org/http://orcid.org/0000-0002-9571-5601
https://orcid.org/http://orcid.org/0000-0002-5451-1864
https://orcid.org/http://orcid.org/0000-0002-1348-7730
Air leakage is one of the critical moisture sources that may compromise the structural integrity and air quality of wood-frame buildings. The present study investigates air leakage through typical North American oriented strand board (OSB) sheathing using a one-of-a-kind analytical chamber, the CARWASh, which is designed to generate temperature- and humidity-controlled outdoor and indoor conditions for the evaluation of water management performance and moisture dynamics of exterior wall assemblies. We establish a baseline estimate for air leakage through OSB sheathing in full-scale wood-frame walls by combining moisture content, temperature, and relative humidity measurements and a one-dimensional transient hygrothermal model. The results show large variations in air leakage between the different OSB panels tested and demonstrate that complete airtightness commonly assumed for wall assemblies in hygrothermal simulations as a computational convenience may not be justifiable. We therefore use the measured data to specify a default air change rate (ACH) value for the average air leakage and assess its impact on the moisture performance of several wood-frame wall assemblies across multiple climate zones. The modeling results imply that a typical through-assembly air leakage likely leads to sizable moisture risk for wood-frame walls under elevated moisture load conditions. This work overall contributes to ongoing efforts in developing a quantitative basis for the evaluation of moisture problems in wood-frame buildings.
Measurement of Through-Assembly Air Leakage and Its Impact on Moisture Performance of Wood-Frame Walls
https://orcid.org/http://orcid.org/0000-0002-7102-7345
https://orcid.org/http://orcid.org/0000-0002-9571-5601
https://orcid.org/http://orcid.org/0000-0002-5451-1864
https://orcid.org/http://orcid.org/0000-0002-1348-7730
Air leakage is one of the critical moisture sources that may compromise the structural integrity and air quality of wood-frame buildings. The present study investigates air leakage through typical North American oriented strand board (OSB) sheathing using a one-of-a-kind analytical chamber, the CARWASh, which is designed to generate temperature- and humidity-controlled outdoor and indoor conditions for the evaluation of water management performance and moisture dynamics of exterior wall assemblies. We establish a baseline estimate for air leakage through OSB sheathing in full-scale wood-frame walls by combining moisture content, temperature, and relative humidity measurements and a one-dimensional transient hygrothermal model. The results show large variations in air leakage between the different OSB panels tested and demonstrate that complete airtightness commonly assumed for wall assemblies in hygrothermal simulations as a computational convenience may not be justifiable. We therefore use the measured data to specify a default air change rate (ACH) value for the average air leakage and assess its impact on the moisture performance of several wood-frame wall assemblies across multiple climate zones. The modeling results imply that a typical through-assembly air leakage likely leads to sizable moisture risk for wood-frame walls under elevated moisture load conditions. This work overall contributes to ongoing efforts in developing a quantitative basis for the evaluation of moisture problems in wood-frame buildings.
Measurement of Through-Assembly Air Leakage and Its Impact on Moisture Performance of Wood-Frame Walls
https://orcid.org/http://orcid.org/0000-0002-7102-7345
https://orcid.org/http://orcid.org/0000-0002-9571-5601
https://orcid.org/http://orcid.org/0000-0002-5451-1864
https://orcid.org/http://orcid.org/0000-0002-1348-7730
Air leakage is one of the critical moisture sources that may compromise the structural integrity and air quality of wood-frame buildings. The present study investigates air leakage through typical North American oriented strand board (OSB) sheathing using a one-of-a-kind analytical chamber, the CARWASh, which is designed to generate temperature- and humidity-controlled outdoor and indoor conditions for the evaluation of water management performance and moisture dynamics of exterior wall assemblies. We establish a baseline estimate for air leakage through OSB sheathing in full-scale wood-frame walls by combining moisture content, temperature, and relative humidity measurements and a one-dimensional transient hygrothermal model. The results show large variations in air leakage between the different OSB panels tested and demonstrate that complete airtightness commonly assumed for wall assemblies in hygrothermal simulations as a computational convenience may not be justifiable. We therefore use the measured data to specify a default air change rate (ACH) value for the average air leakage and assess its impact on the moisture performance of several wood-frame wall assemblies across multiple climate zones. The modeling results imply that a typical through-assembly air leakage likely leads to sizable moisture risk for wood-frame walls under elevated moisture load conditions. This work overall contributes to ongoing efforts in developing a quantitative basis for the evaluation of moisture problems in wood-frame buildings.
Measurement of Through-Assembly Air Leakage and Its Impact on Moisture Performance of Wood-Frame Walls
Lecture Notes in Civil Engineering
Berardi, Umberto (Herausgeber:in) / Farkas, Natalia (Autor:in) / Boardman, Charles R. (Autor:in) / Glass, Samuel V. (Autor:in) / Zelinka, Samuel L. (Autor:in)
International Association of Building Physics ; 2024 ; Toronto, ON, Canada
14.12.2024
6 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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