Should Exterior Crawl Space Vents Be Closed In Winter?


FAQ: Should I close my crawl space vents during winter? In short the answer is generally yes, they should be closed up during the winter months. If you follow our Monthly Maintenance Schedule, we recommend the month of October as a good time to do this.

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Crawl space vents; open or closed?

Frequently Asked Questions

When should I close my crawl space vents for winter?

These vents allow outside air to circulate under the floor in summer to prevent the moisture buildup that encourages mildew and rot. In winter, when the air is drier, the vents are closed to reduce the chance that the pipes in the crawl space might freeze.

Is it better to have crawl space vents open or closed?

Your crawl space vents should always be closed and sealed off from the outside elements. ... First and foremost, open vents allow moisture to enter your crawl space. This creates the perfect environment for mold growth and mildew.

Why are vents closed in crawl space in winter?

In winter, when the air is drier, the vents are closed to reduce the chance that the pipes in the crawl space might freeze. How to Close Foundation Vents in the Winter The simplest way to close foundation vents for the winter is to plug them from the outside with foam blocks made specifically for this purpose.

What should I use to seal my crawl space vents?

Having joist bays & the rim joist air-sealed & insulated with 2-part, closed-cell spray foam will provide you with a first-class air and thermal barrier. As a bonus, your spray foam contractor can seal & insulate crawl space ductwork for a small additional charge. Option #2: Encapsulate & insulate.

When to use outside air in crawl space?

If the air is too cold, too hot, or too moist, the controller senses that and the system will not use that outside air at that time. The dew point outside the house must be lower than the dew point inside the crawlspace for the system to use the outside air.

How can I Keep my crawl space warmer in the winter?

Well, we recommend sealing the crawl space vents and controlling the humidity with a dehumidifier year round. This will keep your crawl space cooler in the summer and warmer in the winter, so you don't have to worry about freezing pipes, and you won't have to worry about remembering to open or close your vents each season.

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