https://www.aquaguard.net | 1-888-479-1203 In this video, Tom DiGregorio, a local expert in crawl space and basement environments, explains why vented dirt crawl spaces are always so humid and moldy in Georgia. Tom explains that between 60 and 80 years ago, when many crawl space type foundations were being built, builders understood that ground water evaporation was the main source of moisture problems in these spaces. They assumed that by lining the ground with plastic to keep the water from evaporating into the crawl, the problem would be solved – and as an additional moisture control measure, they provided vents assuming that the air would thus circulate and help dry any residual moisture in the crawl. That was probably one of the worst assumptions ever made in the history of residential construction. Thanks to a better understanding of building science and of the laws of physics that govern the air flow inside an enclosed structure, we now know that the crawl space vents are not only ineffective to control crawl space humidity, but they actually aggravate the problem, especially during the hot and humid summers in Georgia. On a hot, muggy day, all the moisture present in the air is being carried into the crawl space through the vents. Once inside, the humid air will cool down and the relative humidity will increase by 2.2% per degree of change. A ten degree difference between the outside and the crawl space will cause a 22% increase in relative humidity, often reaching levels way above the 60% mark, the level at which mold starts to grow. The wooden structures will soak up the water and turn into a food source for mold and dry rot. Because the air in a home always moves upwards, the crawl space air will be sucked into the living areas, along with all the mold, foul odors and pollutants found in the nasty crawl space. Ducts running to the crawl will begin to drip with condensation, and the cold air within them will heat up as it passes through this hostile environment before it makes into the rooms it is supposed to cool. Your air conditioner will work much harder to keep you comfortable. During the winter, the cold air will get pulled into your home through the crawl space vents, and the air that you paid to heat will lose temperature as it passes through the freezing cold crawl – making your heating system burn more fuel to keep up. To learn more about crawl space problems and our four step solution, watch out crawl space videos, visit our website of contact us to schedule a free estimate.
What causes mold and moisture problems in crawl spaces?
by aquaguard | May 16, 2014 |