Influence of wind pressures on joint performance

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ConferenceSymposium on Weathertight Joints for Walls: 1967-09, Oslo, Norway
Pages13; # of pages: 3
Subjectrain penetration; weatherproof joints; wind loads; interior water distribution; Air flow/Wind pressure
AbstractRain penetration through the joints of a building can be prevented by controlling the forces which act to cause it. The main force causing rain penetration is an inward air pressure drop. It can be controlled by maintaining the air pressure of the space behind the wetted outside wall at a level equal to that outside. wind pressure, however, varies considerably from point to point on wall surfaces. In addition, experience seems to show that there are abrupt local pressure variations from side to side of projections and recesses in a wall. The equalization of pressure cannot be achieved in a space open in more than one location if wind overloads vary from location to location. If the cavity is closed at strategic locations, we can succeed (or almost succeed) in equalizing the pressures. Despite shortcomings in our knowledge of pressure differences on building surfaces, there are some practical means of reducing the risk of rain penetration. There is great need, however, for serious research on pressure magnitudes and the influence of height and spacing of projections and recesses.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number9873
NPARC number20375065
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Record identifier0a29a9fc-f294-4d3b-96bb-327ce1d466fb
Record created2012-07-23
Record modified2016-05-09
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