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Crawl Space Vents: Open or Closed?

crew covering crawl space vents

Let’s face it: no one dreams of spending their hard-earned money or precious time dealing with a crawl space. But here we are, confronting the reality of home maintenance.

The crawl space is a critical part of your home’s foundation and air quality. One of the biggest questions homeowners face is whether to keep crawl space vents open or closed.

Here’s a look at the pros and cons of both options.

Pros and Cons of Open Vents

Failing old crawl space vent


  • Air Circulation: Open vents allow for air to enter the crawl space.
  • Cost: Keeping vents open can save on the initial costs of sealing and encapsulating the space.


  • Pest Intrusion: Open vents are an easy entry point for pests such as rodents and insects.
  • Moisture Problems: In humid or wet climates, open vents can let in moisture, leading to mold growth, wood rot, and structural damage.
  • Energy Efficiency: Open vents can cause heat loss in winter and increase cooling costs in summer, making your home less energy efficient.

Pros and Cons of Closed Vents

Sealing crawl space vents before encapsulation


  • Moisture Control: Closed vents significantly reduce moisture entry, preventing mold growth and wood rot.
  • Energy Efficiency: Sealing vents can improve your home’s energy efficiency by preventing heat loss in the winter and keeping cool air in during the summer.
  • Pest Prevention: Closed vents deter pests from entering your crawl space, protecting your home from infestations.


  • Initial Cost: Sealing vents and encapsulating the crawl space can require an upfront investment.
  • Professional Installation: Proper sealing and encapsulation often require professional installation to ensure effectiveness.

Why Sealing Vents is the Better Option

Given the pros and cons, sealing crawl space vents is clearly the better option for homeowners. The benefits far outweigh the drawbacks, providing long-term protection and savings.

How Encapsulation Seals Vents and Your Entire Space

Encapsulation involves sealing your crawl space vents and the entire area, transforming it into a dry, usable space.

Here are the steps involved:

Trust Groundworks for Expert Crawl Space Vent Sealing

Groundworks employee working to install encapsulation

When it comes to protecting your home, sealing crawl space vents and encapsulating the area is the best choice.

Groundworks, with decades of experience working with various climates across Northern and Southern Alberta, is the premier choice for this essential service. Our team of experts will provide a free inspection to assess your crawl space and recommend the best solutions for your home.

Trust Groundworks to keep your crawl space dry, healthy, and efficient. Contact us today to schedule your free inspection and start protecting your home.

    Schedule Your Free Inspection

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    The process typically takes a day to a few days, depending on the size and condition of the crawl space.

    While some homeowners may attempt it, proper encapsulation requires professional installation to ensure the vapor barrier is correctly sealed and the insulation is properly installed.

    The cost varies depending on the size of the crawl space and the materials used. Groundworks offers free inspections to provide the most accurate estimate.

    Leah Leitow

    Leah Leitow

    Content Writer

    Leah is a Content Writer for Groundworks with nearly ten years of experience working in the foundation repair industry. Her experience ranges from working with homeowners to find the right solution to training inspectors and staff. In her background as a Michigan journalist, she gained invaluable insight into people's lives throughout our state. Leah lives in metro Detroit with her husband and two sons.