Maya Ellison
When it comes to protecting wood, there are various types of plastic sheeting that can be used, each with its own advantages and disadvantages. The thickness of plastic sheeting is typically measured in mils, and different applications require different thicknesses. For instance, a 6 mil reinforced film can be considered heavy-duty when used to cover a desk to protect it from dust, but the same sheet would not be strong enough for other applications such as lining a landfill. In the context of wood protection, factors such as the type of wood, environmental conditions, and desired level of protection will determine the appropriate thickness and type of plastic sheeting to use.
| Characteristics | Values |
|---|---|
| Use | Covering wood to protect it from rain and snow |
| Type of plastic | Polyethylene, Polycarbonate, Polyvinyl carbonate, Woven plastic film |
| Thickness | 6-12 mil |
| Rigidity | Rigid enough to not drape over the wood |
| Transparency | Clear |
| Durability | 2-10 years |
| Additives | UV protection |
| Ventilation | Ends left open to allow airflow |
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What You'll Learn
Using clear plastic to cover wood
When using clear plastic to cover wood, it is important to consider the thickness, strength, and composition of the plastic. A 6 mil reinforced film can be considered "heavy-duty" and suitable for covering wood to protect it from moisture and dust. However, the same plastic sheet may not be strong enough for other applications such as lining a landfill.
Additionally, if the plastic will be exposed to sunlight, it is important to choose a material with UV protection additives to maintain its strength. Polyethylene, for example, is a common plastic used for greenhouses as it is thin (6- to 12-mil), durable, and inexpensive. However, it cannot be used to cover PVC frames as it will destroy them. On the other hand, polycarbonate is more expensive and rigid, making it suitable for end walls and creating rooms within a greenhouse.
When covering wood with clear plastic, it is also important to ensure proper airflow to prevent condensation and mould. One way to achieve this is by building a frame and draping it with clear plastic, leaving the ends open for airflow while covering the sides and top to protect from ground moisture. Alternatively, corrugated plastic panels can be used to cover the top of the woodpile, allowing moisture to evaporate from the ends.
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Pros and cons of using tarps vs plastic
Tarps and plastic sheets are both commonly used to cover wood, with each offering distinct advantages and disadvantages.
Tarps
Tarps are a reliable choice for protecting materials and structures from the elements, including rain, snow, and wind. They are versatile and suitable for temporary roof protection, covering lumber and equipment, and providing weather protection on construction sites and farms. Tarps are typically made from woven polyethylene ribbons, with variations in thickness and density, and they come in various sizes and colours. They are also incredibly versatile and can be used in a multitude of scenarios, including covering equipment, creating makeshift shelters, and protecting construction sites. Tarps made from materials like polyethylene (PE), polyvinyl chloride (PVC), and canvas are known for their exceptional durability and strength. For example, PE tarps are lightweight yet strong, offering excellent resistance to tearing and abrasion, while PVC tarps can withstand harsh environmental conditions, including extreme temperatures and UV exposure. However, tarps may not be suitable for long-term use as they can break down quickly and may need to be replaced yearly. Additionally, tarps may not provide adequate protection against liquid water coming into contact with the wood.
Plastic Sheets
Plastic sheets offer robust protection against the elements and are commonly used to cover wood piles to keep them dry. They are available in various thicknesses, with a 6-mil reinforced film considered "heavy-duty" for certain applications. Plastic sheets can be specifically designed to meet specific requirements and can include additives like UV protection, fire retardation, fire resistance, bee compatibility, and infrared resistance. While plastic sheets may be more expensive than tarps, they offer greater durability and are less prone to tearing and puncturing. Plastic sheets are also more manageable and aesthetically pleasing, especially when used with clear heavy-duty plastic. However, it is important to ensure good airflow when using plastic sheets to prevent condensation, mould, and rot.
In conclusion, both tarps and plastic sheets have their advantages and disadvantages, and the best option depends on specific needs and budget. Tarps are versatile, durable, and provide good weather resistance, while plastic sheets offer robust protection, durability, and customisability at a potentially higher cost.
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Mil thickness and plastic sheeting
When it comes to plastic sheeting, "mil" is a unit of measurement equivalent to one-thousandth of an inch. To convert the thickness of plastic sheeting from mil to inches, divide the mil value by 1000. For example, a 6-mil plastic sheet is 0.006 inches thick (6 ÷ 1000). The thickness of a plastic sheet is typically measured using a micrometer, which is designed to measure small distances accurately.
The thickness of plastic sheeting can vary, with common thicknesses being 2, 3, 4, and 6 mil. 2-mil plastic sheeting is ideal for light-duty tasks such as painting and dust protection. 3-mil plastic sheeting is suitable for moderate protection in construction and DIY projects. 4-mil plastic sheeting offers more durability and is suitable for temporary weather protection. 6-mil plastic sheeting is commonly used in construction and is perfect for heavy-duty tasks like vapor barriers and crawl space encapsulation. It is considered heavy-duty when used to cover a desk to keep it clear of dust.
In construction, there are specific standards for the thickness of plastic sheeting. For example, a vapor barrier must be a minimum of 6 mil, while the EPA requires hazardous waste HDPE liners to be a minimum of 60 mils. Thicker plastic sheeting is generally more durable, but other factors contribute to durability, such as the scrim, which adds resistance to punctures and rips, and the density of the plastic. For instance, high-density polyethylene (HDPE) is more heat-resistant and performs well under direct UV exposure, but it is more rigid and susceptible to cracking during installation compared to medium or low-density polyethylene.
When covering wood, some people use tarps or clear plastic to protect it from rain and snow. While tarps are commonly used, they can break down quickly and sag under water or rough weather conditions. Clear heavy-duty plastic is a preferred alternative as it is more durable, manageable, and aesthetically pleasing. It is important to ensure good airflow when covering wood to prevent mould and rot. Leaving the wood uncovered until close to the burn season and then covering only the tops, allowing air to circulate, is recommended.
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Using plastic to cover wood for a food garden
Type of Plastic
When selecting plastic to cover wood for a food garden, it is essential to choose a food-grade option, such as food-grade polyethylene or agricultural plastic. This ensures that your plants are not exposed to potentially harmful chemicals. The thickness of the plastic, measured in mils, is also an important consideration. For example, a 6 mil plastic sheeting is commonly used and considered heavy-duty for this application. This thickness provides sufficient durability while still allowing for flexibility and ease of handling.
Benefits of Using Plastic
Plastic covering offers several advantages for your food garden. Firstly, it helps protect your plants from frost damage, which is particularly beneficial in spring and autumn. Additionally, plastic covers can shield your garden from extreme weather conditions like hail, heavy rain, and strong winds. They also act as a barrier against pests, including insects like flea beetles and cabbage worms, as well as larger animals such as deer and rabbits.
Installation and Maintenance
When installing plastic over your food garden, consider using snap clamps or weights like rocks or logs to secure the edges. For raised beds, you can create mini hoop tunnels or use row covers to support the plastic. Ensure that you allow for proper airflow to prevent condensation and mould issues. You can also combine plastic covers with other materials, such as bird netting or chicken wire, to enhance protection against pests.
Alternatives and Considerations
While plastic covers offer benefits, they may not be necessary for all food gardens. Some gardeners prefer untreated wood, which can last several years, or painted wood for their raised beds. Additionally, alternatives like tarps or corrugated plastic panels can be used to cover wood piles or structures. Consider the specific needs of your garden, the local climate, and your personal preferences when deciding whether to use plastic covers.
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Types of plastic for greenhouses
Greenhouse plastic is selected based on the needs of the plants, the local climate, and the desired lifespan of the plastic.
The type of plastic used in a greenhouse should be dictated by the plants' light requirements. Different plastics allow more light compared to others. Clear plastic, for example, lets the most light through and is the recommended choice for greenhouses. However, locations with high-intensity sunlight might require plastics that filter some of the light to prevent plant damage.
The thickness of the plastic is also important, as it needs to withstand heavy rain, snow, hail, and falling sticks. A six mil reinforced film can be considered "heavy duty" and is strong enough to withstand these elements.
The durability and lifespan of the plastic are also important factors. The manufacturer says the UV-resistant properties of the plastic last for 4 years, but some people keep them for 5-6 years before replacing them.
When attaching the plastic to a wooden base, you can use a staple gun. However, a few pieces of wood trim should be placed on top of the plastic once it’s stapled down to prevent a strong wind from ripping the plastic up from the staples.
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Frequently asked questions
The best thickness of plastic sheeting depends on the job it will be required to perform. A six mil reinforced film can be considered "heavy duty" when used to cover a desk to keep it clear of dust. However, the same "heavy-duty sheet" would not be strong enough for other applications, such as lining a landfill.
Polyethylene is the most common plastic used for greenhouses due to its low cost, durability, and ability to trap sunlight and heat. Polycarbonate is another option, offering rigidity and longer lifespan than polyethylene, but it is more expensive and cannot be used for domed or arched greenhouses.
Yes, tarps or plywood scraps can also be used to cover wood. Tarps are more susceptible to caving in with water and breaking down over time, while plywood provides more rigid protection.
Yes, it is important to ensure good airflow when covering wood with plastic to prevent condensation, mould, and rot. Additionally, if the plastic will be exposed to sunlight, it should have UV protection additives to maintain its strength.
