The “con” to a crawl space, in most cases, is that the entire area of the crawl space has only excavated soil trapped underneath it.
It is common practice for builders to lay down a polyethylene vapor barrier but some just leave it in an excavated state. The purpose of a vapor barrier is to limit any moisture infiltration that could allow your crawl space to get humid or wet. In the construction of your home, the builders will add air flow vents for your home to breathe but unfortunately they are not always effective due to the under sizing of the vents for the crawl space area.
Crawl space foundations are widely used in building construction throughout the United States, with approximately 250,000 new homes built on crawl spaces every year and an estimated 26 million such homes already in existence. They are especially common in the southeast, where they are found in over 9 million existing homes and around 70,000 new homes per year.(http://www.advancedenergy.org)
If builders and homeowners are not proactive with all the modern standards and innovations of a crawl space design today, their homes will most likely succumb to environmental moisture issues – mold, ground water infiltration with structural masonry foundation and wood rot problems. Moist crawlspace issues can also result from mechanical failures caused by what is in your crawl space such as a leaky supply or drainage pipe or condensation from HVAC unit & duct and moisture getting in through the existing foundation penetrations and vents. This undesirable moisture can create optimum conditions for molds and allergens to grow in your crawl space possibly causing unhealthy breathing, allergies and odors in your home’s living space for you and your family. Molds can grow on the structural wood in your crawl space. Wood absorbs the moisture entering into your unprotected crawl space raising your home’s wood structure moisture levels, possibly jeopardizing the structural strength and integrity of your home.
By sealing out moisture your home will be protected against many of the expensive home repairs associated with water damage. SealTech accomplishes this by sealing up any holes throughout your crawlspace, vents, pipes and separation in brick or your foundation.