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Crawlspaces and Moisture Control
Left untreated, crawlspace moisture can wreak havoc on a house. Crawlspace construction is a popular practice in many areas of the country. However, one of the inherent problems with crawlspace construction is the control of moisture under the house. Moisture can contribute to conditions that can lead to a number of problems - some with more serious and expensive consequences, including:
- Warped wood that can cause floors to buckle and squeak
- Mold and Mildew
- Wet insulation that loses it's R-value
- An irritating musty smell
- The growth of spores and fungus
- Creating an environment attractive to termites
Kirkland’s offers two of the most effective solutions for controlling moisture in your home.
A moisture meter should be used to measure the moisture content of the wood in the crawlspace. When high moisture exists in crawlspaces, it can support the growth of fungus and mold. A reading of 20% or higher can support the growth of wood decay fungi, which deteriorates and weakens the wood. A reading at of this level signals that there is a moisture problem and corrective action should be taken.
Option # 1 - Proper Ventilation & Moisture Barrier
a) Ventilation
b) Moisture Barrier
Option # 2 - Encapsulation
When moisture levels cannot be controlled by ventilation only, (example: due to construction of home) encapsulations are recommended. Studies have shown that as much as 50% of the air in your home comes up from your basement or crawlspace. This air is often higher in moisture content and carries with it various allergens and musty odors. When conditions linger above 60% relative humidity for extended periods of time, mold, mildew and bacteria growth is stimulated.
Option # 1 - Proper Ventilation & Moisture Barrier
a) Ventilation
b) Moisture Barrier
Option # 2 - Encapsulation
When moisture levels cannot be controlled by ventilation only, (example: due to construction of home) encapsulations are recommended. Studies have shown that as much as 50% of the air in your home comes up from your basement or crawlspace. This air is often higher in moisture content and carries with it various allergens and musty odors. When conditions linger above 60% relative humidity for extended periods of time, mold, mildew and bacteria growth is stimulated.
Measuring and Monitoring Moisture Levels
A moisture meter should be used to measure the moisture content of the wood in the crawlspace. When the wood reaches the fiber saturation point -approximately 20% - it can support the growth of fungus and mold. A reading at or above 20% signals that there is a moisture problem and corrective action should be taken.