Hygrothermal Performance of EIFS-Clad Walls: Effect of Vapor Diffusion and Air Leakage on the Drying of Construction Moisture

2009 ◽  
pp. 32-32-20 ◽  
Author(s):  
AN Karagiozis ◽  
MH Salonvaara
Keyword(s):  
Air Leakage ◽  
Vapor Diffusion ◽  
Hygrothermal Performance

scholarly journals Highly Insulated Wall Systems with Exterior Insulation of Polyisocyanurate under Different Facer Materials: Material Characterization and Long-Term Hygrothermal Performance Assessment

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3373 ◽  
Author(s):  
Emishaw Iffa ◽  
Fitsum Tariku ◽  
Wendy Ying Simpson
Keyword(s):  
Performance Assessment ◽  
Control Strategy ◽  
Energy Efficient ◽  
Material Characterization ◽  
Air Leakage ◽  
Material Development ◽  
Hygrothermal Performance ◽  
New Construction ◽  
Wood Frame

The application of exterior insulation in both new construction and retrofits is a common practice to enhance the energy efficiency of buildings. In addition to increased thermal performance, the rigid insulation can serve to keep the sheathing board warm and serve as a water-resistive barrier to keep moisture-related problems due to condensation and wind-driven rain. Polyisocyanurate (PIR) rigid boards have a higher thermal resistance in comparison to other commonly used exterior insulation boards. However, because of its perceived lower permeance, its use as exterior insulation is not very common. In this study, the hygrothermal property of PIR boards with different facer types and thicknesses is characterized. The material data obtained through experimental test and extrapolation is used in a long term hygrothermal performance assessment of a wood frame wall with PIR boards as exterior insulation. Results show that PIR with no facer has the smallest accumulated moisture on the sheathing board in comparison to other insulation boards. Walls with a bigger thickness of exterior insulation perform better when no vapor barrier is used. The PIR exterior insulation supports the moisture control strategy well in colder climates in perfect wall scenarios, where there is no air leakage and moisture intrusion. In cases where there is trapped moisture, the sheathing board has a higher moisture content with PIR boards with both aluminum or fiberglass type facers. An innovative facer material development for PIR boards can help efforts targeting improved energy-efficient and durable wall systems.

scholarly journals Hygrothermal performance of highly insulated wood frame walls with air leakage: field measurements and simulations.

2021 ◽  
Author(s):  
Michael J Fox
Keyword(s):  
Simulation Models ◽  
Field Measurements ◽  
Test Facility ◽  
Air Leakage ◽  
Predictive Capacity ◽  
Leakage Field ◽  
Hygrothermal Performance ◽  
Wood Frame ◽  
The University ◽  
Building Engineering

The thesis examines the hygrothermal performance of six types of high thermal resistance (High RSI) wall assemblies during environmental exposure and an air leakage (exfiltration) simulation test. These walls were installed in the Building Engineering Group's test facility (BEG Hut) located at the University of Waterloo. The High-RSI wood-frame walls were assessed by analyzing condensation, mould, and decay risks using the moisture content, temperature, relative humidity and heat flux data collected during the field test. These field-measured data were also used to calibrate one-dimensional WUFI® simulation models for each of the High-RSI assembly for use in future durability assessments using a range of North American climates. Methods were investigated to improve the predictive capacity of these simulation models as well as to increase their utility as a research tool. The design, construction and instrumentation details of the High-RSI study were also documented.

scholarly journals Hygrothermal performance of highly insulated wood frame walls with air leakage: field measurements and simulations.

2021 ◽  
Author(s):  
Michael J Fox
Keyword(s):  
Simulation Models ◽  
Field Measurements ◽  
Test Facility ◽  
Air Leakage ◽  
Predictive Capacity ◽  
Leakage Field ◽  
Hygrothermal Performance ◽  
Wood Frame ◽  
The University ◽  
Building Engineering

The thesis examines the hygrothermal performance of six types of high thermal resistance (High RSI) wall assemblies during environmental exposure and an air leakage (exfiltration) simulation test. These walls were installed in the Building Engineering Group's test facility (BEG Hut) located at the University of Waterloo. The High-RSI wood-frame walls were assessed by analyzing condensation, mould, and decay risks using the moisture content, temperature, relative humidity and heat flux data collected during the field test. These field-measured data were also used to calibrate one-dimensional WUFI® simulation models for each of the High-RSI assembly for use in future durability assessments using a range of North American climates. Methods were investigated to improve the predictive capacity of these simulation models as well as to increase their utility as a research tool. The design, construction and instrumentation details of the High-RSI study were also documented.

Field study of hygrothermal performance of highly insulated wood-frame walls under simulated air leakage

2019 ◽  
Vol 160 ◽  
pp. 106202 ◽  
Author(s):  
Hua Ge ◽  
John Straube ◽  
Lin Wang ◽  
Michael John Fox
Keyword(s):  
Field Study ◽  
Air Leakage ◽  
Hygrothermal Performance ◽  
Wood Frame

Brief-Measurements of Vapor Diffusion Coefficient

1954 ◽  
Vol 46 (11) ◽  
pp. 47-49 ◽  
Author(s):  
C.Y. Lee ◽  
C.R. Wilke
Keyword(s):  
Diffusion Coefficient ◽  
Vapor Diffusion
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