Discusses control of condensation, and moisture transfer through walls. Various air pressure barriers are suggested to control leakage. One-, two- and three-stage joint methods of wall construction are compared.
This wind tunnel investigation studies the effects of surrounding buildings on the wind pressure distribution over a 1 1/2-storey single-family house. Pressure coefficients obtained in the tests have been used for the calculation of air change rates and associated heat losses from the house for a range of wind speeds and internal-external temperature differences. For these calculations leakage areas in the building envelope have been assumed to be uniformly distributed.
A constant concentration tracer gas system was designed and constructed to continuously measure the air infiltration rate in as many as ten zones of a building. The portable, microcomputer controlled system injects a metered amount of tracer
Describes a method to estimate differences in external pressure values between walls from known mean pressure coefficients on the facades and roof of the building in question and from the determination of wind values on the site and at the same height as the building.
The current industry standard for measuring air leakage of windows, curtain walls, and doors is ASTM E283. This test measures the ability of fenestration products to resist air leakage under ideal laboratory conditions which usually are at s
Energy efficient steel buildings with better thermal insulation to reduce transmission losses are now being built in Sweden. Examples of structural design are given to minimise the influence of thermal bridges. A method for the calculation of such heat losses is presented. Principles for airtightness to reduce air leakage of buildings are discussed, special details and material requirements are given.
A brief synopsis of recent analytic and experimental studies is given. Conclusions are that convective transfer of water vapour into an attic from the living space below often transports more moisture than diffusive transfer through the ceiling construction. Large quantities of moisture are stored in the roof sheathing during warm spring and summer periods. Solar loading during mild winter periods can produce desorption of moisture from the sheathing. This paper reviews the formulation of mathematical relationships among physical parameters governing moisture transfer within attics.
Describes the physics of moisture in the home. Suggests four basic strategies for dealing with excess moisture buildup in the home: 1) minimise the entry and release of moisture, 2) protect building components with vapour barriers, 3) remove water vapour with ventilation or dehumidifiers and 4) raise theinside surface temperature of windows.
Test structures were constructed near Madison, Wis, USA and Gulfport, Miss, USA for exposure of eight types of insulated wall panels at controlled indoor conditions and typical outdoor weather conditions. Panels were instrumented with moisture sensors and tested without and with penetrations (electrical outlets) in the indoor surface. Continuous internal vapour barriers effectively prevented cold weather condensation in all panels. Installation of an electrical outlet changed moisture patterns in both the cold winter climate and the hot, humid summer climate.
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