![]() ![]() Opposite to what one might expect, capillary action prefers small holes or pores, rather than larger ones. Although not as serious as bulk water movement, capillary forces are both powerful and rather secretive, since they often work in theĭark of a crawlspace, causing significant damage to a building without the occupant’s knowledge. One common example of this action is water “wicking” up through a paper towel, following the direction of the paper fibers. Capillary ActionĬapillary action refers to the ability of water to travel up against the pull of gravity through a porous material. Proper sealing is done by meticulous attention to flashing and caulking details, and door and window installation. The keys to controlling that water are to direct it away from the home and to seal any holes that water might come through.ĭirecting water away from the home is accomplished by proper grading, drainage, gutters, and downspouts. In most locations, there will be water present during at least part of the year. A driving force such as gravity or air pressure.Three conditions are required to allow bulk moisture flow into a building: Typically thought of as rain or snow, bulk moisture movement also includes flowing groundwater. Bulk water movement (rain, snow, or groundwater)īulk moisture movement (or liquid flow) has the potential to be the most damaging moisture transport mechanism confronted by a building.It will also discuss how geographic location and house type can affect choices of moisture control strategies.Īpplied building science is concerned with four different moisture transport mechanisms and the effects of that moisture flow: ![]() This section will cover the basics of moisture and its effects on the house system. Moisture FlowĬontrolling moisture flow in a building has significant impacts on occupant health and safety, comfort, building durability and energy efficiency. This introduction defines many of the theories behind the ENERGY STAR New Homes requirements. This introduction focuses on three particular areas:įor each of these issues, the introduction explores causes, control measures, and effects on both buildings and occupants. Many aspects of building design, construction, and operation can affect the health and comfort of the people in the building. ![]()
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