CRAWLSPACE CONSTRUCTION PERFORMANCE AND CODES
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CONDITIONED CRAWLSPACES ARE MORE EFFICIENT THAN VENTED CRAWLSPACES According to building science consulting firms such as the Building Science Corporation, conditioned crawlspaces are more efficient than vented crawlspaces “in terms of safety, health, comfort, durability, and energy consumption.” In the same line, conditioned crawlspaces are not more expensive than vented crawlspaces, and current model codes do not allow the construction of unvented crawlspaces, except under some specific conditions.
Despite the said above, in the United States, crawl space foundations are still built with permanent vents to the outdoors to ensure cross-ventilation to prevent moisture, but it can contribute to long-term structural damage caused by outdoors humid air and other issues coming from the ground and dirt floors. Likewise, research has shown that vented crawlspaces located in humid climates are vulnerable to the moisture level, and this increases moisture and condensation on wooden floor framings and promotes mold growth and structural damage.
INSULATION
Traditionally, some contractors use foam plastic insulation, and this practice is sometimes questionable because these foam insulations have the potential to release toxic or flammable gases when heated and accelerate the spread of flames in the case of a fire. However, there are other and better insulation products that can reduce or eliminate those risks.
VAPOR BARRIERS Vapor Barriers vapor barriers or vapor retarders are usually installed when it comes to performing crawl space encapsulation methods. These elements protect your crawl space against groundwater entry and other contaminants caused by exposing the earth in unvented crawl space foundations. Also, professionals must secure vapor barriers on ground floors to insulate the rest of the home from exposed dirt.
MECHANICAL DRYING
Even if you have installed a vapor retarder on the ground, it is necessary to keep dry your crawlspace by using continuously operated mechanical exhaust ventilation such as mechanical drying, dehumidifiers, fans, supply air from the HVAC, or conditioned air from the living space above.
Following the building codes is essential to condition your crawl space. For example, it is crucial to check with local authorities before insulating the area to ensure that the insulation products meet all code requirements. Besides, professionals recommend that thermal insulation must be attached to the walls, and it must be done with a Class I vapor retarder.
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