Are Crawl Space Vent Covers A Bad Idea?
What’s The Purpose Of Crawl Space Vents?
- Waste of energy – Once hot air fills the space below your home, it has nowhere else to go but up. If your air conditioning is constantly battling the increase in humidity below your home, your energy bills could soar in the hotter seasons.
- Bad air quality – In case you didn’t know, you actually breathe the air from the floor below you. If your crawl space is humid or musty, you could start to smell and breathe in strange odors or mold.
Should You Close Crawl Space Vents?
Most professionals recommend closing any crawl space vents with covers. Each city has different building codes, but experts always recommend closing any open crawl space vents. If you’re unsure if your crawl space is affected by outside moisture, here are a few notable signs.
- Musty odors – Once your crawl space starts to smell, odors can rise into the rest of your home, making your living space feel damp and musty.
- Condensation – Look for any condensation on your crawl space walls, floors, beams, and pipes.
- Mold – Standing water can lead to mold growth and health issues.
- Rodents or insects – Raccoons, mice, rats, and other small creatures love to make dark and damp environments their home.
- Efflorescence – When water seeps into your crawl space walls, it can leave behind a white, powdery substance called efflorescence. This is a good indication your crawl space has moisture problems.
- Rust on pipes, wiring, or ductwork – The plumbing, wiring, and ductwork underneath your home shouldn’t be exposed to any moisture or frost.
- Rotten wood – Wood rot can grow on the wooden beams and joists beneath your home if they’re exposed to moisture. This can lead to serious structural issues.
If Your Crawl Space Has Moisture
- Crawl space encapsulation – Encapsulation involves sealing your crawl space walls and floors with a thin layer of impermeable polyethylene sheeting. This 10 to 20 mil thick barrier keeps moisture from seeping through your walls and prevents your crawl space from becoming too humid. Many studies have shown that an encapsulated or sealed crawl space creates a healthier and more energy-efficient home.
- Drain tile system with a sump pump – If groundwater is building up around your crawl space, experts recommend installing a drain tile system and a sump pump. If water seeps through your crawl space walls, the vapor barrier will catch the moisture, allowing it to drop down into a perforated pipe at the base of your walls. This pipe (the drain tile) will channel any collected water to a sump pit where it will build up. Once the water reaches a certain level inside the sump pit, the sump pump activates and ejects the water away from your home. This waterproofing system is one of the most effective solutions on the market.
- Dehumidifier – A dehumidifier is perfect for circulating clean and dry air inside your encapsulated crawl space. Experts will choose the most optimum position so that it can keep humidity levels down in your entire crawl space. Note: If you decide not to close your crawl space vents, a dehumidifier will have a harder time filtering intruding outside air.