Crawl space encapsulation is the process of sealing the crawl space from the outside. It involves installing thick, overlapping sheets of polyethylene plastic on the crawl space walls and exposed dirt floors. The purpose of crawl space encapsulation is to reduce humidity and prevent leaks, pest infestations, and mold.
Encapsulating the crawl space closes it off to vermin and eliminates the risk of harmful infestations. In fact, sealing the crawl space is one of the best ways to control some household pests such as roaches and ants because that's where they go to hide and breed.
Basic crawl space encapsulation costs between $2 and $4 per square foot, while more extensive encapsulations can total between $3 and $10 per square foot. The latter normally involves more substantial cleaning, repairs, and requested features.
As the saying goes, “It's better to have it and not need it than to need it and not have it.” That said, coverage varies widely for things like crawl space repair and encapsulation. It depends on your provider and policy, but the general rule of thumb is that if it's preventable, it's not covered.
Average Lifespan of Crawl Space Encapsulation
On average, it can last around 10 to 15 years. However, if properly installed with quality materials, it's not unusual for it to last longer.
While crawl space encapsulation aims to block moisture from entering your home, it can also trap existing moisture inside. If not adequately addressed, this trapped moisture can cause mold growth and other issues.
Encapsulation falls under the insulation and air-sealing category. Under the tax credit, you can claim 30% of the cost, up to $1,200. A crawl space that costs $4,000 to encapsulate maximizes this tax credit. If your crawl space costs less than $4,000 to encapsulate, you will not receive the full $1,200 in credit.
The cost of crawl space waterproofing ranges from $3,000 to $15,000, depending on the size of the crawl space and material used. If any repairs are required, such as crack repair or installing extra drains, pipes, and wires, plan to pay between $7,000 and $20,000.
Benefits to Encapsulating Your Crawl Space
Eliminates possible insect infestation- insects need water and moisture to survive. Crawl space encapsulations eliminate the possibility for insects to thrive without high moisture levels. Prevents mildew and mold concerns- Moisture is the root of these two issues.
Vapor barrier installation is an option for most as it's a lot cheaper than crawl space encapsulation, and as it doesn't require any other pumps or air conditioning methods, it makes sense as to why.
Why is crawlspace encapsulation so expensive? The cost of crawl space encapsulation reflects the comprehensive approach it takes to address moisture control. The process involves not just the installation of a vapor barrier, but also potentially adding insulation, sealing off vents, and installing a dehumidifier.
Before your crawl space can be insulated, the old insulation needs to be removed. A good contractor will do this because the old traditional insulation, like fiberglass, prevents the spray foam from really getting into the nooks and crannies.
If not properly installed or maintained, encapsulation can lead to trapped moisture, creating an environment conducive to mold growth and wood rot. Moreover, initial costs to seal crawl space can be high, and incorrect installation may inadvertently seal in existing pests or moisture.
The moisture can cause mold growth, rotting of wood under your house, and structural damage. A dehumidifier without encapsulation can help. It sucks out the excess moisture from the air and makes your crawl space healthier and drier.
While encapsulation addresses foundation leaks, it may not tackle thermal transfer. Achieving an air seal is crucial for insulation. Spray foam is the superior choice as it ensures both encapsulation and an effective air seal for optimal results.
Having professional contractors encapsulate your crawl space accounts for 50%–70% of the total. That means paying anywhere from $2,250–$10,500 for a 1,500-square-foot home.
Typically, a vapor barrier primarily defends against the gaseous water vapor from the soil, which may not be as protective against water pooling. Encapsulation does protect against water pooling. Unlike vapor barriers, an encapsulated crawl space requires a sump pump and dehumidifier.
Budget-Friendly: If you're watching your pennies, a crawl space might be your best bet. They're significantly less expensive to build than basements, with costs ranging from $10,000 to $20,000 on average. Energy Efficiency: Surprisingly, these low-ceilinged spaces can be more energy-efficient.
This tax credit is effective for products purchased and installed between January 1, 2023, and December 31, 2032. Claim the credits using the IRS Form 5695 .
Crawl spaces that are closed-off increase property values by making homes more energy-efficient, improving indoor air quality, and preventing water damage. Encapsulating a crawl space can also be an effective way of keeping out pests since they won't be able anywhere for them to nest.
While it seems like a lot, encapsulating a crawlspace is a relatively simple project that you can do over a long weekend. By assessing your crawlspace, cleaning it out, and laying down a vapor barrier and insulation, you'll protect your home for years to come.
The first sign that you shouldn't encapsulate a crawl space is standing water, as in the photo below. If bulk water is coming into the crawl space, covering it up with plastic is may be worse than doing nothing. That water is probably going to find ways to get on top of the plastic.
While it's not always the case, crawl spaces can create a whole set of problems for a home. They often have moisture issues, especially if they aren't properly ventilated or dehumidified. And problems with your crawl space can create issues for your entire home, including your air quality.
Even with the crawl space itself, insulated, temperatures can still get very low. You can improve the protection of your pipes by adding insulation to them. Foam insulation is fairly affordable – you just need to ensure the width matches your pipes.