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Vents, ventilation drying, and pressure moderation

Straube, J. F. and Burnett, E. F. P.
1995
Building Engineering Group Report for Canada Mortgage and Housing Corporation

Straube, J. F. and Burnett, E. F. P., (1995), Vents, ventilation drying, and pressure moderation, Building Engineering Group Report for Canada Mortgage and Housing Corporation.
Abstract:
"The objective of this report is to explore the influence of vents on ventilation and pressure moderation by presenting the results of some experimentation, providing a summary of related research, and attempting to theoretically model the physical phenomena involved. The emphasis is on the vents and ventilation rather than on pressure moderation... This report attempts to define the problems and potentials, develop upper and lower bounds of likely performance, and provide some theory and measurements as a precursor to future more detailed studies."--Introduction.

The orientation, size, and nature of vents in screened exterior wall systems are important to wall performance because these characteristics affect venting, ventilation and pressure moderation. The ventilation of screened wall systems has received very little attention in Canadian building research. With funding from CMHC's External Research Program, the Building Engineering Group at the University of Waterloo undertook an experimental and theoretical study of vents and venting in screened walls (see fig. 1). The objective of this study was to define the problems and potentials, develop upper and lower bounds of likely performance, and provide some theory and complementary experimental measurements as a precursor to future more detailed and directed studies. The scope of the study extended to all screened and vented exterior wall systems. Masonry veneer walls were of special interest because of their wide use and the special importance of ventilation to this type of wall.
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Author Information and Other Publications Notes
Straube, J. F.
Department of Civil Engineering, University of Waterloo, Waterloo, Ontario N2L 3T2 Canada
  1. A review of rain control and design strategies
  2. Drainage, ventilation drying and enclosure performance
  3. Driving rain and building facades
  4. Field testing of filled-cavity wall systems
  5. Indoor air quality, healthy buildings, and breathing walls
  6. Methodology and design of field experiments for monitoring the hygrothermal performance of wood frame enclosures
  7. Moisture control in enclosure wall systems
  8. Moisture fundamentals and mould
  9. Moisture in buildings
  10. Moisture movement in building enclosure wall systems
  11. Overview of hygrothermal (HAM) analysis methods
  12. Pressure moderation and rain penetration control
  13. Rain control and screened wall systems
  14. Simplified prediction of driving rain deposition
  15. The influence of low-permeance vapor barriers on roof and wall performance
  16. The role of hygrothermal modeling in practical building design: case studies  
Burnett, E. F. P.
  1. A review of rain control and design strategies
  2. Development of design strategies for rainscreen sheathing membrane performance in wood frame walls
  3. Drainage, ventilation drying and enclosure performance
  4. Driving rain and building facades
  5. Field testing of filled-cavity wall systems
  6. Moisture movement in building enclosure wall systems
  7. Overview of hygrothermal (HAM) analysis methods
  8. Rain control and screened wall systems
  9. Simplified prediction of driving rain deposition
  10. The Ontario wall drying project
  11. Uncertainty analysis for vapor pressure measurement
  12. Ventilation drying in enclosure wall systems  


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