Dehumidification >> How To Maintain Humidity In A Home

Uncontrolled moisture indoors can cause major damage to the building structure, How To Maintain Humidity In A Home as well as to furnishings and to finish materials like floors, walls, and ceilings. Uncontrolled moisture can trigger mold growth which not only damages the school facility, but can lead to health and performance problems for students and staff. Mold is usually not a problem indoors unless there is excess moisture. 

Primary causes of indoor moisture problems in new schools include: Use of building materials that are repeatedly or How To Maintain Humidity In A Home deeply wetted before the building is fully enclosed Poor control of rain and snow resulting in roof and flashing leaks Wet or damp construction cavities Moisture-laden outdoor air entering the building. Condensation on cool surfaces 

NOTE:Controlling moisture entry into buildings and preventing condensation are critical elements of How To Maintain Humidity In A Home protecting buildings from mold and other moisture related problems such as pest infestation and damage to building components.Moisture migration in buildings is highly complex and depends on a variety of factors, including the climactic conditions where the school is being built. 

For this reason, in addition to the guidance below, designers should consult other references on How To Maintain Humidity In A Home moisture control. Building Materials Newly constructed buildings give off significant amounts of moisture during their first year as a result of moisture trapped within materials such as fresh concrete, green lumber, and "wet"-applied insulations. 

Keep building materials dry during construction. Building materials, especially those with moisture absorbing properties like wood, insulation, paper, and fabric, How To Maintain Humidity In A Home should be kept dry to prevent the growth of mold and bacteria. If moisture is present, mold will grow on any virtually any material. Some building materials such as wood may arrive at the construction site with a high moisture content or may have been wetted before arrival or during the transport process. Wet materials need to be allowed to dry as much as possible as weather permits. Cover dry materials with plastic to prevent rain damage, and if resting on the ground, use spacers to allow air to circulate between the ground and the materials. 

Dry water damaged materials as quickly as possible, preferably within 24 hours. Due to the possibility of mold and bacteria growth, How To Maintain Humidity In A Home materials that are damp or wet for more than 48 hours may need to be discarded. Precipitation Control There are four primary methods for preventing rain and snow from causing moisture problems in buildings: sloped roofs, ground slope, covered entries, and air intakes. Problems in these areas generally allow moisture to leak or be blown into the building. 

1.Sloped Roof— Over the life of a building, How To Maintain Humidity In A Home sloped roofs are less likely to cause major moisture damage from rain and snow as compared to flat roofs. The resulting space under a sloped roof can be used for HVAC equipment and ductwork, and other mechanicals and electrical. Catwalks will allow year-round access to the equipment for easier and more timely maintenance. 

2.Ground Slope— Ensure that ground next to the building slopesawayfrom the foundation. This is How To Maintain Humidity In A Home a well understood design practice, yet sometimes a newly finished building will have surface water ponding next to the building instead of quickly moving away from it. 

3.Covered Entries— Ensure that exterior entries have sufficient overhang to prevent rain or How To Maintain Humidity In A Home snow from being blown into the building, or large amounts of moisture collecting directly in front of the entry where it can be tracked into the building.

 4. Sloped Intake Plenum— Consider adding a section of sloped intake plenum that causes moisture to How To Maintain Humidity In A Home flow to the outside or to a drain if intake grilles are not designed to completely eliminate the intake of rain or snow. 

Building Envelope It is extremely important to prevent uncontrolled moisture from entering the building envelope through window and door openings, seams, footings, How To Maintain Humidity In A Home roofs or other openings. In virtually all areas of the country, provide an exterior weather barrier to prevent moisture from entering construction cavities. Wet or damp construction cavities (e.g., spaces between interior and exterior walls), attics, and plenums are major sources of mold and can contribute significantly to indoor air quality problems. In addition, moisture can damage the structure and degrade the performance of insulation, increasing energy and operating costs. 

Water also enters construction cavities through a process of moisture migration. Moisture migrates from the warm and humid side of the construction assembly to the cold dry side of How To Maintain Humidity In A Home the construction assembly. Air pressure differentials can also drive moisture into interior and exterior walls, creating mold-favorable environments, and they can do so in both heating climates and hot, humid climates. In hot, humid climates, even slight negative interior pressures can pull hot outdoor moisture into chilled wall cavities during cooling periods if the building envelope is not properly designed and constructed. 

Similarly, during heating periods, positive pressures can push warm, moist air from indoors into chilled exterior walls. In either case, How To Maintain Humidity In A Home this uncontrolled moisture can lead to mold growth that impairs indoor air quality and damages building materials. Thus, assuring the integrity of exterior walls (or interior walls where moisture migration may be a problem) is the first line of defense for preventing this problem in all climates. 

For hot, humid climates, a slightly positively pressurized building may also help, as a slightly negatively pressurized building may help in heating climates. However, How To Maintain Humidity In A Home in mixed climate areas, using positive or negative pressures can create problems as the weather changes. Ultimately, the most reliable solution is the proper construction of the building envelope. 

To prevent moisture migration, framed walls, floors, and roofs should have a vapor/air retarder on the warm, moist side of the insulation. In mixed or cooling climates, How To Maintain Humidity In A Home special care must be taken in the placement of vapor/air retarders. Vapor retarders are available as part of most insulation products.Common examples would be asphalt impregnated paper or metal foil. Care should be taken during construction to ensure that this vapor retarder is continuous, tightly secured at the framing members and not damaged.

 Special care should be taken in lockers, showers, food preparation areas, How To Maintain Humidity In A Home and other spaces that are likely to have high humidity. For floor slabs in immediate contact with the ground, consider installing a 3-6 mil continuous vapor barrier under the slab to prevent moisture entry through the slab.

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