Ethan Clarke
Vented crawl spaces have traditionally been the norm, with the belief that they help control moisture and prevent damage to your home's foundation. However, recent studies have challenged this notion, suggesting that sealed crawl spaces may be more effective in certain climates for moisture control and energy efficiency. Whether you decide to keep your crawl space vented or sealed, installing a plastic vapour barrier is crucial for controlling moisture. This involves measuring your crawl space, purchasing the appropriate amount of plastic sheeting, and laying it down with overlapping seams. The plastic sheeting helps create a barrier against moisture and vapour, minimizing the risk of mould or mildew and providing a suitable storage space.
Explore related products
What You'll Learn
Measure the crawl space
Measuring a crawl space for a vapour barrier is a straightforward process. First, grab a tape measure and head into the crawl space. Be careful not to bump your head! Once inside, measure the length, width, and height of the walls. If your crawl space has an odd-shaped foundation, measure by sections or rooms, and be sure to measure around any columns or piers as they will need to be covered for optimum energy efficiency.
After taking these measurements, you can calculate the square footage needed for the walls. Add the length and width of the space, then multiply that number by two. Take that number and multiply it by the height of the crawl space. This will give you the square footage needed for the walls.
For the floor, you will need to calculate the square footage separately. Multiply the length and width of the floor.
Now that you have the measurements for both the walls and the floor, you can determine how much material you will need to cover both surfaces. It is recommended to use a four- or six-foot-wide roll of vapour barrier material, which should give you enough length to overlap the wall and floor.
Additionally, you can use a crawl space vapour barrier calculator to help with determining the amount of material needed. This tool will take your measurements and calculate the required amount of material for your project.
Flipshelf Folding Shelves: Plastic Connectors for Easy Assembly
You may want to see also
Explore related products
Choose the right plastic sheeting
Plastic sheeting in your crawl space can serve many useful purposes. It can help control moisture, create a barrier against vapour, protect your home and occupants from radon infiltration, and create a suitable storage space.
When choosing the right plastic sheeting, it is important to consider the thickness of the plastic. While some sources recommend a thickness of 6-mil, a thicker grade of material is preferable. Thinner sheeting may be more pliable but is generally insufficient as a barrier against vapour or moisture. It can also be easily damaged during other crawl space work, such as pouring concrete or reinforcing supports. This can create larger holes in the plastic that allow moisture to seep through. Instead, experts recommend sheeting that's either 10-mil or 20-mil for enhanced durability and moisture resistance.
In addition to thickness, it is important to consider the type of plastic sheeting. Recycled polyethylene sheeting, for example, can become brittle and weaken over time, providing little long-term utility and potentially requiring additional costs to satisfy local building codes. It is also important to ensure that the plastic sheeting is installed correctly, as improper installation can lead to moisture issues and health implications.
Finally, when choosing plastic sheeting, it is essential to consider the specific needs and characteristics of your crawl space. For example, the minimum thickness of 6-mil is inadequate if the floor of the crawl space has rocks, roots, or concrete chunks. Additionally, if your crawl space has existing insulation, there may not be much advantage to using a plastic vapour barrier, as it could hold moisture or dampness in the floor insulation.
Sanitizing Vintage Plastic Pitchers: A Step-by-Step Guide
You may want to see also
Explore related products
Overlap seams
When laying vented crawlspace plastic, it is important to ensure that the seams between plastic sheets are overlapped. The recommended overlap for seams is typically around one to two feet. This allows for a nice lay-down of the plastic and helps to prevent ripping or puncturing.
It is also advised to tape down the overlapped seams for added security. While taping is not always necessary, it can provide a stronger seal and reduce the risk of tripping. The tape used should be duct tape or a waterproof seam tape specifically designed for crawl space vapor barriers.
In addition to taping, landscape fabric stakes can be used to secure the overlapped seams. These stakes are hammered into the soil around the edges of the plastic sheeting to hold it in place.
Overlapping seams by a sufficient amount and securing them with tape or stakes helps to create a more durable and effective vapor barrier in your crawlspace. This will enhance the moisture control and protection offered by the plastic sheeting.
It is worth noting that while a completely drum-tight installation may seem ideal, having a little "slack" in the vapor barrier can be beneficial. This reduces the chances of the taped seams ripping or puncturing when someone walks on them or when other work is being done in the crawlspace.
Heat Pressing Vinyl on Plastic: A Quick Guide
You may want to see also
Explore related products
Tape and seal
Plastic sheeting in a crawl space is an effective way to control moisture and create a barrier against vapour. This can be achieved by taping and sealing the plastic sheeting.
To begin taping and sealing the plastic sheeting, first, ensure that the crawl space floor is made of dirt or soil. Then, spread 6-millimetre plastic sheeting or thicker over it. Overlap the seams between the plastic sheets by a foot or two and tape them down. Use duct tape or waterproof crawl space liner tape to seal the seams. This will ensure that the crawl space is protected from moisture and vapour.
Next, seal around any foundation support columns or pillars with masonry or drywall. Use a masonry drill, mallet, and Christmas tree ratchet fasteners designed to be installed through the butyl tape to create an airtight seal. This will prevent pests, moisture, and vapour from migrating into your living space.
Additionally, if your crawl space includes pipes or other penetrations, seal the vapour barrier tightly around them with seam tape. This will ensure that no moisture or vapour can enter through these openings.
Finally, at the edges of your crawl space where the soil meets the walls, leave several inches of sheeting allowance. Secure the sheeting to the soil using landscape fabric stakes and a hammer. This will create a complete seal around your crawl space, effectively blocking moisture, vapour, and pests.
Fastening Plastics to Steel Studs: Best Practices
You may want to see also
Explore related products
Install an exhaust fan
Installing an exhaust fan is an effective way to improve crawl space ventilation and prevent moisture-related issues. Here is a step-by-step guide on how to install an exhaust fan as part of your vented crawl space setup:
Step 1: Assess Your Crawl Space
Before installing an exhaust fan, it is crucial to assess your crawl space layout and dimensions, current moisture problems, and environmental conditions. This information will guide you in selecting the appropriate fan size and model, as well as determining the best placement for optimal air circulation.
Step 2: Choose the Right Exhaust Fan
Not all crawl space ventilation fans are the same. Consider the square footage of your crawl space when selecting a fan; larger areas will require more powerful fans. Also, take into account the climate conditions. If you live in an area with frequent freeze conditions, choose a fan with built-in thermostatic controls to prevent operation below a certain temperature, thus avoiding frost damage.
Step 3: Prepare the Installation Area
Locate the ideal installation spot. Crawl space fans should be installed at least 3 feet away from any outside corners, behind existing crawl space vent openings. Take precise measurements of the vent dimensions (height and width) to ensure you purchase a fan with the correctly sized mounting plate.
Step 4: Install the Exhaust Fan
The installation process will vary depending on the fan model and your specific crawl space. Be sure to follow the manufacturer's instructions carefully. The process typically involves mounting the fan housing, wiring electrical connections, and installing insect mesh screening for safe and reliable operation.
Step 5: Maintain and Inspect the Exhaust Fan
After installing the exhaust fan, regular maintenance is crucial for optimal performance and longevity. Schedule routine inspections and cleaning to keep the fan blades free from debris and ensure all electrical connections are secure.
By following these steps and consulting with professionals as needed, you can effectively install and maintain an exhaust fan in your vented crawl space, improving air circulation and reducing moisture-related issues.
Why Does Your Lettuce Need Plastic Wrap?
You may want to see also
Frequently asked questions
Plastic sheeting in a crawl space helps to create a barrier against moisture or vapour. This approach minimises the risk of mould or mildew and helps create a more suitable storage space.
Polyethylene plastic sheeting is the best choice for moisture abatement and storage protection. While some sources recommend a thickness of 6-mil, a thicker grade of material is preferable for enhanced durability and moisture resistance.
First, measure your crawl space's length and width and purchase enough plastic sheeting to cover the entire space. Cut and lay down strips of plastic sheeting, ensuring that seams overlap by a foot or two. Tape down the seams and use landscape fabric stakes to secure the sheeting to the soil.
