Maya Ellison
Crawl spaces can be a source of issues such as moisture, pests, and poor air quality. Crawl space encapsulation is a solution to these problems, which involves sealing the crawl space with a vapor barrier and other materials to prevent moisture, pests, and outside air from entering the space. This can be done using plastic sheeting, such as Visqueen plastic, to cover the crawl space floor and attaching it to the foundation walls, piers, and equipment. The vapor barrier helps to keep moisture out of the crawl space and can be attached to the walls using construction adhesive or duct tape. This process can help to improve indoor air quality and create healthier living conditions.
| Characteristics | Values |
|---|---|
| Purpose | To prevent moisture, pests, and outside air from entering the crawl space |
| Materials | Plastic sheeting, vapor barrier, adhesive seam tape, caulk, duct tape, concrete, foam board, spray foam, mechanical fasteners, double-sided tape, termination bars, masonry screws |
| Preparation | Clean and clear the crawl space, fix any damaged or loose fixtures, replace rusty pipes, replace torn insulation |
| Process | Seal all openings, vents, gaps, and cracks with appropriate materials, attach the vapor barrier to the walls, piers, foundation, and equipment, seal off the outdoors |
| Benefits | Improved indoor air quality, reduced pests, energy savings, extended HVAC equipment lifespan, additional storage space |
| Challenges | Mold, moisture, pests, standing water, inadequate drainage, structural damage, carbon monoxide |
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What You'll Learn
Prepare the crawl space
Preparing the crawl space for encapsulation is a critical step in the sealing process. Here are the key steps to follow:
Clear and Clean the Crawl Space
Start by clearing out any debris, junk, and old equipment that may be stored in the crawl space. This step may involve discovering hidden treasures or dealing with unwanted guests like insects and rodents. It is also important to check for standing water to prevent any risk of electrocution when bringing power or lighting into the area.
Assess and Treat Moisture Issues
Before encapsulation, address any moisture issues in the crawl space. Check for signs of water damage, such as standing water or moisture accumulation. Inspect the walls, floors, and other surfaces for any water stains or leaks. If there are issues with humidity or damp soil, consider installing a water drainage system to direct water away from the crawl space.
Deal with Mold and Mildew
Inspect the crawl space for mold and mildew growth. If there is existing mold, treat it with a mold killer product or bleach. Apply mold-resistant products to ensure it doesn't reappear. If there are only old stains, spraying them with bleach can ensure that the mold is inactive.
Fix and Replace Fixtures
Ensure that all fixtures are in good condition. Fix any damaged or loose fixtures, and replace rusty pipes. Check the insulation for any tears or damage, and replace it if necessary. This step is crucial to creating a healthy and safe environment in the crawl space.
Inspect for Pests
Seal any entrances that may allow pests such as rodents or insects to enter the crawl space. Look for gaps, cracks, or openings that could provide entry points for these unwanted guests. You may need to seal vents, pipes, floors, walls, siding, and any other areas where pests could gain access.
Engage a Professional
Consider hiring a professional contractor to inspect the crawl space thoroughly. They can check for issues such as water damage, mold growth, pest infestations, or structural damage. A professional can provide guidance on the best course of action and help ensure the encapsulation is done correctly to create a healthy and dry environment.
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Seal vents and openings
Sealing vents and openings is an essential step in crawl space encapsulation. This process prevents moisture from seeping into the crawl space and creating an environment conducive to mould and pests. It also helps to improve indoor air quality and reduce structural damage caused by moisture.
To seal vents and openings, you will need to use materials such as foam board, spray foam, and caulk. Start by sealing off any vents using foam board and spray foam. This will create a barrier that prevents humid outdoor air from entering the crawl space. Make sure to also attach foam board to the crawl space door to further seal off the area.
Next, move on to sealing any remaining gaps, cracks, and openings. Use spray foam to seal band joists, AC drain line runs, plumbing penetrations, wiring, and any other openings. Pay close attention to sealing all gaps between the crawl space and the floor of your home. This will help to ensure that moisture and pests cannot enter your living space.
In addition to foam board and spray foam, you may also need to use construction adhesive or duct tape to seal certain areas. For example, when laying down plastic sheeting, you will need to overlap the seams and seal them with duct tape. You can also use construction adhesive to seal the plastic sheeting to the foundation wall, creating a tight seal that prevents moisture from entering.
It is important to note that sealing vents and openings is just one part of the crawl space encapsulation process. To effectively encapsulate a crawl space, you will also need to install a vapor barrier, address drainage issues, and ensure that the space is clean and free of any mould or pests. Working with a professional can help ensure that the encapsulation is done correctly and that your crawl space is properly protected.
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Install a vapor barrier
Installing a vapor barrier in a crawl space is a great way to keep your home healthy by preventing moisture, mould, and mildew from seeping through the soil and creating dampness, musty odours, and structural issues. It is not a complicated or expensive project, but it can be hard work. Here is a step-by-step guide on how to install a vapor barrier:
First, ensure your crawl space is cleaned and cleared of any debris, especially anything sharp that might puncture the plastic sheeting. Construction workers often toss discarded building materials in this space, so it is important to remove all unwanted items. Use a garden rake to level out the ground as much as possible.
Next, use a dehumidifier, fans, or a pump to remove any remaining moisture or standing water. You may need several days to dry out the crawl space before installing the vapor barrier.
Then, lay down 6-mil or thicker polyethylene plastic over the entire crawl space, cutting the sheets to size. Allow 6 inches or more along the walls, and overlap the seams by no less than 12 inches. Secure the seams with poly PVC tape.
After that, cover any exposed foundation walls with 1-1/2 inches of rigid, moisture-proof insulation. Then, unroll the vapor barrier along the vertical wall and apply it to the exposed, double-sided tape. Make sure the vapor barrier extends higher than the tape. Once the vapor barrier is stuck to the walls, secure it to the concrete with a mechanical fastener like termination bars, using masonry screws.
Finally, seal off all vents and openings to the outdoors with foam board and spray foam. Seal off all remaining gaps and cracks with spray foam, including band joists, AC drain line runs, plumbing penetrations, and wiring.
Remember, a vapor barrier alone may not be enough to fully protect your crawl space. For the most efficient protection, consider installing a dehumidifier, crawl space drains, a sump pump, and insulation alongside your vapor barrier to create a comprehensive encapsulation system.
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Seal the barrier to the walls
Sealing the crawl space with a vapor barrier is an effective way to prevent moisture, pests, and outside air from entering the space. The vapor barrier should be sealed tightly to the walls to ensure that the crawl space is completely encapsulated.
To seal the barrier to the walls, start by unrolling the vapor barrier along the vertical wall, applying it to the exposed double-sided tape. Ensure that the tape is pressed firmly and evenly around the walls, creating a seal that will block harmful moisture and odors. It is important that the vapor barrier extends higher than the double-sided tape.
Once the vapor barrier is attached to the walls, secure it with mechanical fasteners such as termination bars. For masonry walls, you may need to pre-drill holes into the concrete wall before attaching the termination bars. Drilling through masonry can be challenging, so consider using a powder-actuated gun to speed up the process.
In addition to sealing the walls, pay attention to any pipes, columns, or other penetrations. Cut slits in the vapor barrier to fit tightly around these areas, and then tape them securely with seam tape. This will ensure that the entire crawl space is sealed off from vapor and soil gases.
Finally, if you are using plastic sheeting to cover the crawl space floor, extend the sheeting up the foundation wall by at least six inches and seal it with construction adhesive or a pressure-treated nailing strip. This will create a continuous barrier that prevents moisture from seeping in from the ground.
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Add a drainage system
Adding a drainage system to your crawl space is crucial to prevent water damage and issues such as mould and mildew growth, structural damage, and poor air quality. Here are the steps and considerations for installing a drainage system in your crawl space:
Identify the Right Drainage System
Before installing a drainage system, it is essential to determine the right type for your specific needs. Consult with a professional who can assess your crawl space and recommend the most suitable system. Depending on your location and local regulations, you may be required to install a specific type of drainage system. For example, Canadian building codes mandate that the lowest level of a house has a floor drain connected to either the storm or sanitary system.
Exterior French Drain Systems
Exterior French drain systems are installed outdoors around the perimeter of your home. These systems collect water as it drains into a trench, and then direct it away from your foundation or crawl space through an underground pipe. This type of system is particularly effective in preventing moisture from reaching your crawl space and keeping your home's structure dry.
Interior Drain Systems
Interior drain systems, such as sump pumps or French drains, are installed inside the crawl space. Sump pumps are effective in removing water intrusion and preventing water damage. French drains, on the other hand, can be installed in the centre of the crawl space and attached to the perimeter. They are especially useful in areas close to large bodies of water, as they can manage high water tables and prevent the crawl space from flooding.
Combine with Other Moisture Prevention Measures
To ensure the effectiveness of your drainage system, combine it with other moisture prevention measures. Seal any openings, vents, pipes, and cracks in your crawl space to prevent moisture from seeping in. Additionally, consider encapsulating your crawl space with a plastic vapour barrier to further protect against moisture and potential flooding.
Regular Maintenance
Regularly inspect and maintain your drainage system to ensure its effectiveness. Keep an eye out for any signs of water intrusion or flooding in your crawl space, and address any issues promptly. By staying vigilant and proactive, you can prevent costly water damage and maintain a healthy and dry home environment.
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Frequently asked questions
Sealing your crawl space with plastic prevents moisture, pests, and outside air from entering the space. This can lead to structural damage over time as the vapour can rot your home's wooden frames and flooring.
Before encapsulating the crawl space, ensure the crawl space is cleaned and any mould is treated. Conduct a safety inspection to ensure your combustion appliances are not emitting carbon monoxide. Check for any issues such as water damage, mould growth, pest infestations, or structural damage.
You will need a plastic vapour barrier, adhesive seam tape, caulk, construction adhesive, duct tape, concrete, and a sump pump or drainage system.
Cover the entire crawl space floor with plastic sheeting, using a wide roll to cut one large piece. Seal the plastic to the foundation wall with construction adhesive and tape the seams together. Attach the vapour barrier to the foundation walls, piers, and equipment, and seal off all vents and openings to the outdoors.
