Best Heavy Duty Plastic Greenhouse Covers for Gardens and Hoop Houses
The best heavy duty plastic greenhouse cover depends on the frame size, desired sheet thickness, and whether you need a cut-to-length roll or a finished tarp. The 20-mil 16-by-20-foot cover is best for buyers prioritizing thickness, while the VEVOR 6-mil, 12-by-100-foot roll suits large projects that need flexible coverage. For extra-large frames, the 30-by-40-foot tarp offers the broadest listed dimensions. Compare the product measurements with your structure before ordering.
| Product | Listed size | Thickness | Best for |
|---|---|---|---|
| 20-mil clear tarp | 16 × 20 ft | 20 mil | Buyers prioritizing thickness |
| VEVOR poly sheeting | 12 × 100 ft | 6 mil | Long runs and custom cuts |
| 16-mil large tarp | 30 × 40 ft | 16 mil | Large structures |
| 16-mil clear tarp | 14 × 18 ft | 16 mil | Smaller framed projects |
| 16-mil clear tarp | 16 × 20 ft | 16 mil | Medium-size greenhouse frames |
20-Mil 16-by-20-Foot Greenhouse Cover
This clear tarp measures 16 by 20 feet and is listed as 20 mil thick. Its product title also identifies it as waterproof, UV-resistant, and anti-tear, with grommets for securing it. It is presented for garden, farm, and chicken-coop use.
Best for: Buyers who want a thicker finished cover in a common medium-to-large size. It was selected for its stated 20-mil thickness and combination of clear sheeting and grommets. Limitation: The listed dimensions may not match every frame; allow for the structure’s roof curve and attachment points when measuring.
VEVOR 12-by-100-Foot Greenhouse Sheeting
This clear polyethylene film comes in a 12-by-100-foot roll and is listed as 6 mil thick. The product description identifies it for farms, gardens, and outdoor plants, and names resistance to water, sun, frost, wind, and dust.
Best for: Buyers covering long hoop-house runs or needing to cut sheeting to project dimensions. The roll format offers more length than the finished tarps in this selection. Limitation: At 6 mil, it is thinner than the listed 16- and 20-mil options, and the provided features do not specify grommets.
16-Mil 30-by-40-Foot Greenhouse Tarp
This clear covering is listed as 30 by 40 feet and 16 mil thick, with a product title indicating use as greenhouse plastic and a chicken-coop cover. Its size makes it the largest finished tarp listed here.
Best for: Buyers who need broad coverage for a large greenhouse frame or outdoor enclosure. It was selected for its large dimensions and specified thickness. Limitation: A sheet this large can be difficult to position and secure; confirm the frame dimensions and plan the attachment method before purchase.
16-Mil 14-by-18-Foot Clear Tarp
This 14-by-18-foot clear plastic tarp is described as 16 mil thick, waterproof, and UV resistant. The title also specifies grommets and uses for gardening, farming, and nursery applications.
Best for: Buyers with a smaller greenhouse or hoop-house frame who want a finished cover with attachment points. Its dimensions and listed grommets make it a practical size-specific option. Limitation: It covers less area than the 16-by-20-foot and 30-by-40-foot tarps, so measure carefully if the roof and sides need one continuous sheet.
16-Mil 16-by-20-Foot Clear Greenhouse Tarp
This 16-by-20-foot cover is described as a heavy-duty, waterproof, UV-resistant clear tarp with grommets. The listing identifies gardening, farming, and nursery uses.
Best for: Buyers who need more width and length than the 14-by-18-foot option but do not need the 30-by-40-foot sheet. It was selected as a middle-size finished tarp with stated UV resistance and grommets. Limitation: This is 16 mil rather than the 20-mil option in the same 16-by-20-foot size.
Buying Guide: How to Choose Greenhouse Plastic
What thickness should you choose?
Compare the listed mil thickness, but do not treat it as the only measure of suitability. These options range from 6 mil sheeting to 20 mil tarps. The 6-mil roll is easier to cut for custom coverage, while the thicker finished tarps may better fit buyers who prioritize heavier material. The product information does not establish a specific service life for any option.
Should you buy a roll or a tarp?
A roll is useful when you need a long continuous strip or want to cut material to fit. A finished tarp offers fixed dimensions and, on some listed products, grommets for securing the cover. Check whether the roll’s width can span your roof and sides before choosing it.
How do you measure a greenhouse for plastic?
Measure the full path over the roof curve, not only the straight-line width. Include the sides or end panels if the same sheet will cover them, and allow material for fastening. Compare those measurements with the listed sheet dimensions before ordering.
Which features matter outdoors?
Look for product details that match your exposure and installation needs, such as UV resistance, waterproofing, tear resistance, or grommets. Feature claims vary by listing. Secure the cover to the frame appropriately, since sheet thickness alone does not describe how it will perform in local wind or weather.
Frequently Asked Questions
Is 6-mil plastic suitable for a greenhouse?
The VEVOR option is listed as 6 mil and intended for greenhouse and outdoor plant use. Buyers seeking thicker material can compare it with the listed 16- and 20-mil tarps.
What does a greenhouse tarp with grommets offer?
Grommets provide listed attachment points for securing a tarp. Their presence does not determine whether the tarp fits a particular frame; confirm the size and fastening layout.
Is thicker greenhouse plastic always better?
Not necessarily. Thickness is one comparison point, but dimensions, roll-versus-tarp format, stated features, and installation needs also matter.
Can a 30-by-40-foot tarp fit a small greenhouse?
It may be larger than needed. Measure the frame and coverage path first; an oversized sheet can require extra handling and secure attachment.
Does UV-resistant plastic block all sunlight?
The listed 14-by-18-foot tarp is described as UV resistant, but the product information does not state that it blocks all sunlight or specify a light-transmission percentage.