What is UNDERGROUND CRAWL SPACE? What does UNDERGROUND CRAWL SPACE mean?
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What is UNDERGROUND CRAWL SPACE? What does UNDERGROUND CRAWL SPACE mean? UNDERGROUND CRAWL SPACE meaning - UNDERGROUND CRAWL SPACE definition - UNDERGROUND CRAWL SPACE explanation.
Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license.
An underground crawl space (as the name implies) is a type of basement in which one cannot stand up â the height may be as little as one foot (30 cm), and the surface is often soil. Crawl spaces offer a convenient access to pipes, substructures and a variety of other areas that may be difficult or expensive to access otherwise. While a crawl space cannot be used as living space, it can be used as storage, often for infrequently used items. Care must be taken in doing so, however, as water from the damp ground, water vapour (entering from crawl space vents), and moisture seeping through porous concrete can create a perfect environment for mould/mildew to form on any surface in the crawl space, especially cardboard boxes, wood floors and surfaces, drywall and some types of insulation.
Health and safety issues must be considered when installing a crawl space. As air warms in a home, it rises and leaves through the upper regions of the house, much in the same way that air moves through a chimney. This phenomenon, called the "stack effect," causes the home to suck air up from the crawl space into the main area of the home. Mould spores, decomposition odours, and fecal material from dust mites in the crawl space can come up with the air, aggravating asthma and other breathing problems, and creating a variety of health concerns.
It is usually desirable to finish a crawl space with a plastic vapour barrier that will not support mould growth or allow humidity from the earth into the crawl space. This helps insulate the crawl space and discourages the habitation of insects and vermin by breaking the ecological chain in which insects feed off the mould and vermin feed on the insects, as well as creating a physical inorganic barrier that deters entrance into the space. Vapour barriers can end at the wall or be run up the wall and fastened to provide even more protection against moisture infiltration. Some pest control agencies recommend against covering the walls, as it complicates their job of inspection and spraying. Almost unheard of as late as the 1990s, vapour barriers are becoming increasingly popular in recent years. In fact, the more general area of conditioned vs. unconditioned crawl spaces has seen much research over the last decade.
Alternatively, some find it desirable to create a "breathing home" with ample air flow, rather than "finish" a crawl space. There are contrary opinions as to what is healthier with many suggesting that vapor barriers simply create a new space where mould and mildew can flourish, trapping moisture below it and still creating a problem inside the home.
These are also sometimes known as 'Couchies' in England.