High Moisture Content in crawl spaces can lead to Mold, Mildew, Fungus, Bacteria, and damage to the structure. Moisture in a crawl space has been known to cause many issues under homes.
Once it is found, then comes the decision on what to do about it. Wood rot can almost always be attributed to some sort of overwhelming moisture in your crawl space. 3 Reasons Your Crawl Space Has High Humidity & Grows Stuff. When high moisture is found it usually is associated with molds, mildews, wood rot, termites, standing water, etc. Wood Moisture Content (WMC) is a measurement of how much water your wood is holding. What else can moisture do to your crawl space? The ideal WMC is 10% -12%. Moisture contents in wood floor joists in houses with moisture problems are exceeding the 20% maximum level for air dried lumber. Moisture will be condensing out constantly during summer and parts of spring and fall. ... as soon as it was brought to the site—I found no evidence of checking to see if the new flooring was at a compatible moisture content with the house or the subfloor. Closed crawl spaces consistently out perform vented crawl spaces in terms of moisture control and energy use. Moisture Sources The main sources of water in the liquid or vapor phase are ground water or rain water intrusion, evaporation from the soil, and water vapor carried in with ventilation air. equation: moisture entering and leaving the crawl space.
... the determining factor for mold growth on wood depends on the temperature and moisture content of the wood. Vented crawl spaces rarely get any kind of damp-proofing or perimeter drains on the exterior. A Dixon Pest Services Moisture Control Specialist will perform a thorough inspection, measure wood moisture content, look for moisture intrusion areas, and identify drainage and ventilation problems.
Moisture in a crawl space can cause mold to grow and create health risks in a home. Moisture can also come from the ground outside the house by migrating through the foundation walls. Posted by Allison Bailes on May 10, 2011. Here we discuss how to prevent the sources of moisture from creating an environment where mold can grow and affect the health of the home. 16-20 - Readings indicate a possible elevated level of wood moisture. If you’re experiencing too much moisture in your crawl space, you can run into problems that stretch far past just wood rot. When the wood moisture content goes above 15% the wood begins to deteriorate and when it goes above 20% it begins to rot. Crawl Space Moisture Wreaks Havoc on a Solid Wood Floor. The excess moisture Crawl Space Moisture Problems? This is a very common one. Ideally the crawl space will be around 50% RH or less, anything above 60-70% RH brings problems with mold, termites, etc. High Moisture in Crawlspaces Finding high moisture in a crawlspace can lead to a homeowner's worst nightmare. As a result, wet soil outside the crawl space can come right through, as you see below. Sealing the crawl space floor better isn’t going to mitigate high moisture and neither is clearing vents and drains because relative humidity is too high for much of summer. Wood rot only occurs when the moisture content is above the fiber saturation point, about 27% to 28% wood moisture content. Crawlspace moisture issues as I define them are wood moisture content levels above 19%. Kiln-dried wood has seven to 10% wood moisture content. MOISTURE CONTENT IN WOOD STRUCTURAL MEMBERS IN RESIDENCES WITH DECAY DAMAGE: RESULTS OF FIELD STUDIES R.A. Spray ABSTRACT Moisture and decay problems are occurring in South Carolina. Remember to be aware of what is going on in the spaces of … In general, condensation forms when the relative humidity in your crawl space reaches 100%.
Such readings should alert the homeowner to look for a source of excess moisture in the crawl space, and to be sure that foundation vents are opened for continuous year round ventilation. This home had no Vapor Barrier so the moisture …
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