16 Mil 20x40 ft Waterproof Tarp - Heavy-Duty Outdoor Cover

In this review the reviewer looks at the 16 Mil 20x40 ft tarp as a straightforward, heavy-duty cover for outdoor gear; it is best for homeowners and outdoor enthusiasts who need large, waterproof protection without custom fitting. The single biggest reason to buy is the combination of a 16-mil polyethylene body and reinforced edges that deliver dependable water and UV protection for large items like RVs, boats, or stacked firewood. The review examines real-world durability, attachment convenience, and when the tarp may be overkill or not ideal.

Key Features

• 16 Mil Thickness: A heavier polyethylene sheet provides improved load-bearing strength and resistance to punctures compared with thinner tarps for outdoor use.
• 20' x 40' Coverage: The extra-large dimensions let one tarp cover an RV, truck bed, multiple patio sets, or a campsite area without seams.
• Waterproof and UV Protection: A waterproof surface with UV resistance helps keep gear dry and slows sun-related degradation when used for long-term covers.
• Reinforced Edges: Sewn and reinforced hems reduce tearing at stress points so the tarp holds up better where ropes and bungees attach.
• Rust-Proof Grommets: Grommets spaced every 18 in make securing the tarp straightforward and help maintain stability in wind.
• All-Weather Performance: Designed to resist wind, rain, storms and sandstorms so stored items remain protected across seasons.

Who It's For

The tarp suits homeowners who need a single, large cover to protect an RV, boat, motorcycle, stacked lumber or patio furniture through wet seasons and sun exposure. Campers and tailgaters who want a roomy shelter or ground sheet will also appreciate the waterproof surface and reinforced edges.

Those who need a lightweight, ultra-compact tarp for backpacking or precise-fit indoor covers should look elsewhere, as this product prioritizes coverage and durability over minimal weight and pack size. Buyers expecting professional-grade canvas breathability should note this is polyethylene and optimized for waterproofing.

Pros & Cons

Pros

• Large 20' x 40' size covers big items without seams or multiple tarps.
• 16 x 16 weave and 16 mil thickness provide solid tear resistance for everyday outdoor use.
• Reinforced edges and rust-proof grommets every 18 in make tying down quick and reliable.
• Built-in UV and aging protection extend usable life when left outside.

Cons

• Some users report mixed impressions of thickness and long-term durability, so expectations should be realistic for heavy, repeated industrial use.
• The tarp is large and less suitable for situations requiring a compact, ultralight option.

Specifications

Material	Polyethylene
Thickness	16 Mil
Size	20 ft x 40 ft
Weave Density	16 x 16
Grommet Spacing	Every 18 in
Edge Treatment	Reinforced hems

Our Verdict

For anyone needing a large, waterproof cover that balances size, reinforced construction, and simple attachment, this 16 Mil 20x40 ft tarp is a sensible value choice. It excels at protecting vehicles, yard equipment and camp areas from rain and sun, though buyers wanting ultralight or breathable canvas should choose another material. Overall it is good value for general-purpose outdoor protection.

Frequently Asked Questions

Is this tarp waterproof?
Yes, the polyethylene surface is waterproof and designed to keep covered items dry.

How often are grommets placed?
Grommets are spaced every 18 in along the reinforced edges for secure tie-downs.

Will it resist UV and aging outdoors?
The tarp includes UV protection and aging-proofing to withstand sun exposure and seasonal weather.