![]() ![]() ![]() And when the crawl space is flooded, the air that travels up through your house is overly humid, forcing attic vents to manage more moisture than they were designed to manage. In fact, 40% of the air we breathe on the first floor of our homes comes from our crawl spaces. Through a phenomenon known as the “stack effect,” the air from your crawl space moves up through the house and escapes through the vents in your attic. ![]() The impact of water in a crawl space doesn’t just stop beneath your house, however it can actually cause issues throughout the home, even all the way up to the attic. Why prevent flooding? Well, standing water in your crawl space can lead to the growth of mold, mildew, and foundational wood rot - all things that impact the structural integrity of your home and/or the health of its occupants. Improper Crawl Space Ventilation & the Stack Effect With that, crawl space ventilation exists primarily to prevent moisture buildup in your crawl space. While it may seem intuitive to close vents in the winter to keep your floors warm, closing your vents will more than likely only trap water in your crawl space, resulting in too much moisture and an increased risk of issues.Įspecially in wetter areas like Seattle and Portland, the main purpose for having crawl space ventilation is the same reason we have crawl spaces in the first place: to regulate moisture levels in our home. If everything in your crawl space is properly insulated, including the above floors of your home and all of the piping, then your crawl space vents should be able to do their job effectively, mitigating water buildup in your home. That said, our recommendation really depends on how well your space is insulated. We almost never recommend closing or sealing your crawl space vents the architect and engineers who designed your crawl space ventilation system designed it that way for a reason. The short answer to whether or not you should seal your crawl space vents? Don’t do it. Unvented Crawl Space: Should I Seal My Crawl Space Vents? If you have any additional questions after reading, don’t hesitate to contact us by calling (866) 673-9626 or submitting the form at the bottom of this page for a free estimate. In this blog post, the Crawl Pros team answers all of your top crawl space ventilation questions, even confronting the age-old vented vs. And depending on when and where your home was built, your crawl space could be ill-equipped to regulate its moisture levels. Having too much moisture in your crawl space can lead to a whole mess of issues - from mold to pests to structural damage. Do you know how moisture escapes your crawl space, or if it does at all? Chances are you’ve never really thought about it … but when it comes to the energy efficiency and health of your home, it’s important to understand the crawl space ventilation beneath your feet. ![]()
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