Okay, let’s start with the definition. I’m sure that most of us still wondering of what is crawl space vents. According to Wikipedia, a crawl space vent is a penetration in the wall of a building which allows air to circulate from the crawl space beneath the building to the exterior. Environmental condition can create enclosed spaces. Making proper ventilation can be the solution to minimalize this problem. Well, crawl space vents are openings in the wall which enable the movement of the air. In some vents, they fitted with metal which resist the movement of rodents and vermin. Based on the international building code, one usual rule to make vents is 1/150 of the floor area served.
In this modern day, using crawl space vents has been an issue that is being reconsidered. There are some issues raised due to this crawl space vents. This stuff enable outside air into the home, but sometimes not vice versa. When the humidity high, the air vented into a crawl space will be humid too. So, crawl space vent will increase the humidity and lead to condensation. In winter time, this crawls space vent should be shut entirely to block the cold air into the house. In rainy season, this crawl space vents also bring wet air into the house. Based on these prepositions, crawls space vents may bring more harm than good to your house. It also create stack effect, which according to Wikipedia again, is a phenomenon by which warm air rises in the home and exits from the upper levels. Well, maybe the best way is to shut off all crawl space so that the outside air cannot enter the house and vice versa. Many people agree that the best way is to close the crawl space vents soil with heavy ‘6-mil polyethylene vapor diffusion retarder.
Crawl Space Vents Installation