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Vents below ground level
an absolute crawl space (usually dirt-covered plastic vapor barrier and foundation vents open), the home inspector did not want to see the vents below the level of the soil. If during the vents grades, rain and drain water is probably the crawl space – which attract wood destroying organisms or fungal lead to issues such as rot and mold.
If openings are far enough below ground level, the dirt blocking the vents, so that air can not circulate. The vents are not ventilated! When home inspectors see this condition when slots can not be fixed by removing or grading soil, the inspector is likely to recommend that the customer has ventilation holes. The easiest ventilation holes framework is made of pressure-treated wood. However, the metal or plastic vent holes, specially made for this purpose, can be purchased at building stores. A well dug in the ground in front of the hole, and deeper than the holes, so there is an opening in front of and below the vent. I personally love to see a well dug a few inches deeper than the opening, the space filled with pea gravel to about 2 “below the vent.
and the other issue is that people often block the openings of a absolute crawl space. While this is sometimes justified in the winter when there is a danger that the pipes severe temperatures, blocked ports in Washington state defined by the Washington State Department of Agriculture an absolute crawl space as conducive to attractive wood destroying organisms. is a state-licensed structural pest inspector, in most cases, sites blocked fan slots in a favorable condition. Pacific Northwest, where pipes are wrapped, openings foundation can be left open all year round in most years. This is the basic information that does not apply to severe climates or partially heated or “conditioned” crawl spaces.
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Source by Steven L. Smith