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Foundation Vents & Accessories

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Set Up Proper Crawlspace Ventilation

Depending on where you live, you may need to consider proper crawlspace ventilation when acquiring renovation or building supplies for your home’s foundation. When open, vents allow air to circulate underneath your house. This helps to prevent mold and mildew from developing in warm weather. In cold climates or during the winter, you might consider closing or covering crawlspace vents to prevent wet, cold air from causing issues.


Many crawlspace vents have metal grating — or you can fit them with grating — to prevent debris, dust and pests from entering your home. Some grates are nonflammable and ember-resistant and are, therefore, good for areas where forest fires are a possibility. If you live in an area prone to hurricanes or flooding, consider flood vents that allow water to flow in and out to prevent foundation damage due to hydrostatic pressure.


Many homeowners choose to open crawlspace vents in warm weather and close them in cold weather. To enable this, you can select vents offering manual operation or vents that open and close automatically, depending on the temperature. If your vents are older, be sure to check out our guide on how to replace a foundation vent.


Frequently Asked Questions


Q: Are foundation vents necessary?

A: Whether or not your home requires foundation vents will depend on the building codes in your area. Look into local regulations when building or renovating this part of your home.


Q: When should you open foundation vents?

A: Opening your foundation vents when the temperature and humidity levels rise allows air to circulate under your house, reducing the risk of moisture problems in the crawlspace. In the winter, it's often a good idea to close the vents to reduce the risk of frozen pipes. Some homeowners seal crawlspaces completely to keep out moisture — the foundation vents in these homes would remain sealed year round.


Q: How many foundation vents do I need?

A: The number of foundation vents you need for proper crawlspace ventilation will depend on the size of the space. A good rule is to have one foundation vent every 8 to 10 feet.