Are Crawl Space Vents Safe?

Crawl space vents were initially installed in properties to increase airflow and prevent issues like dampness and humidity. This has turned out to be a mistake. 

The Reasoning for Crawl Space Vents 

Initially, crawl space vents became incredibly popular for homes because people actually believed that it kept the crawl space healthy. The reasoning was that when crawl spaces seemed “musty” or “stale,” it was simply due to the fact that the crawl space didn’t have fresh air coming in from the outside. Therefore, people reasoned that the answer was to allow air from the outside to circulate into the crawl space. 

However, over recent years, people have come to realize that crawl space vents actually make these problems worse overall. As a matter of fact, you can fix problems like musty and stale crawl space air by focusing on total crawl space encapsulation and air circulation from other parts of the house, rather than allowing untreated outside air into the crawl space. 

The Drawbacks 

Unfortunately, the drawbacks and weaknesses associated with crawl space ventilation are just too numerous for this benefit to carry much weight. Uncovered crawl space vents are a perfect gateway for rain, snow, and even mud during storms. They also make it easier for pests to get into your home. 

Even during relatively good periods of weather, crawl space ventilation that relies on bringing in air from outside can cause real problems. This is because of the humidity in the air, particularly in summer. As the warm, humid air enters a crawl space, it will quickly cool and lose its ability to hold moisture. This will lead to condensation forming in the crawl space and cause dampness to take root.