Many soffit vents are combo units consisting of alternating solid and vented pieces which provide much less air flow than fully vented soffit does. Typical garages can get by with vented soffit and vented Since a single dairy cow can produce 11.5 pounds of water vapor per day exhaust type ventilation is necessary for control of their environment. The amount of ventilation required varies based upon the utilization of the building.įor farm buildings, ventilation helps keep odor to a minimum and removes carbonĭioxide for optimum animal health. Ventilation Ventilation is a necessary ingredient to aid in condensation control. As an example, FSK (foil/scrim/kraft) has a perm rating of 0.02 Any facing material withĪ perm greater than 1.0 is not considered a vapor barrier. The lower perm value means a better vapor barrier facing. The facing material of vapor barriers are rated using a scale called ' perm'. That is why it takes a combination of insulation, ventilation, and vaporīarriers to properly solve difficult condensation problems. (See comments about pouring your slab after your building is finished below). If vapor pressure gets too high in your barn any vaporīarrier will cease to work, regardless of the material used or how carefully you seal it up. Vapor pressure changes with temperature and humidity. Vapor pressure is what drives water vapor through a vapor barrier. Vapor barriers are really only vapor retarding materials. Some southern areas with hot humid climates install the vapor barrier on the outside surface of the insulation. In most locations this is the inside surface of the insulation. Vapor barriers are installed on the warm side of the insulation. Insulation, a vapor barrier, and proper ventilation are all crucial elements of condensation control, especially in areas where condensation problems are prevalent. If its 70° outside and the relative humidity is 50%, that means that the airĬontains 50% of the moisture it can hold (at that temperature).Ĭondensation Control Vapor barriers are used to resist vapor penetration from the moisture source. Problems are more extreme in areas where temperatures frequently drop to 35° and lower for long periods.Įveryone has heard of relative humidity. When this warmer airĬontacts cold surfaces in your pole barn, condensation forms since the air loses its ability to retain as much moisture.Ī literal example of this is that 45° air can hold 1/3 the water vapor that 75° air can. Warm air has the ability to hold more moisture than cold air. The amount of condensation depends on temperature differences and dew point. Condensation Condensation occurs when warm moist air contacts cold surfaces.
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