Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
A tarp that rips in a stiff breeze or pools water in the first rain cannot keep your gear dry. The real test is not the “16 mil” on the package — it is whether the edges hold, the grommets stay put, and the material keeps animals and equipment bone-dry through a full season outside. The Pattiumo 16 Mil 12×20 Tarp is the most trusted pick because it earns a 4.6-star rating from nearly a thousand owners who call its 16 mil thickness “very thick” and report it survives months on a farm roof without tearing.
I’m Mohammad Maruf — the founder and writer behind KitchPrep. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
Below, you will find the six best options to consider when shopping for a 20 x 12 heavy-duty tarp, each assessed on the details that actually matter for outdoor coverage, from material thickness to grommet placement.
Our Picks at a Glance
How To Choose The Best 20 X 12 Heavy-Duty Tarp
Not all “heavy-duty” tarps are built for the same job. Some are meant for temporary shelter, while others are designed to stay strapped over a woodpile or a chicken coop roof through rain, snow, and high winds. The two most critical specs to check before buying are the material’s thickness in mils and the weave count, which tells you how densely the polyethylene fibers are packed. A tarp listed at 16 mil with a 15×17 weave is going to handle a lot more abuse than a 12 mil tarp with a 14×14 weave.
Finish Size vs. Cut Size
This is the most common surprise. A “12×20” tarp in one brand might measure 12×20 feet right from the start, while another could be a few inches short on each side because the product is sold as a “cut size” — a rough rectangle before hemming and heat-sealing. For a permanent installation, you want a finished size tarp so you get the full coverage you paid for. Many of the picks in this review are specifically noted for being true-to-size.
Grommet Placement
Grommets are where your tarp meets the rope or bungee cord. If they are spaced too far apart, the center of the panel will flap in the wind. The standard spacing you want for a 12×20 tarp is roughly every 23 inches. A tighter spacing — every 18 inches — gives you even more control and reduces the risk of the tarp tearing loose in a storm. You also want rustproof aluminum grommets, not brass-plated steel that can corrode after a season of rain.
Quick Comparison
| Model | Best For | Thickness | Grommet Spacing | Weight | Amazon |
|---|---|---|---|---|---|
| CSCRI 12×20 Tarp★ Best Overall | Instant outdoor kennel roof | 16 Mil | 23.6 in | 11.7 lb | Check Price |
| Pattiumo 12×20 TarpAlso Great | Long-term farm & animal shelter | 16 Mil | 23.6 in | 5 lb | Check Price |
| Kesfitt 12×20 Tarp | Bright coverage & pool covers | 16 Mil | 23.6 in | — | Check Price |
| Bluyard 12×20 Tarp | True-size boat & equipment cover | 16 Mil | 23.6 in | 9 lb | Check Price |
| RAINDEWAY 12×20 White Tarp | Shade sail & bright outdoor setups | 12 Mil | 17.7 in | 10 lb | Check Price |
| GUARD SHIELD 12×20 Tarp | Above-ground pool & extreme weather | 16 Mil | 18 in | 14.3 lb | Check Price |
In‑Depth Reviews
1. 16Mil Finished Size 12×20 Tarp Heavy Duty Waterproof, Large Outdoor Multipurpose Protective Cover (Silver/Black)
Our pick — over 4.5★ from 350+ verified ratings; the strongest balance of quality and price.
A 5.3 kg (11.7 lb) fabric weight that owners call “thick and tough like a good tarp should be” — heavier than the Pattiumo because of its 15×16 dense weave.
The standout spec here is the fabric weight: at 5.3 kilograms (about 11.7 pounds), this is one of the heavier tarps in the group, and that weight translates directly into confidence. The weave count (the number of plastic strands per square inch) is 15×16, which is a tighter, denser construction than typical budget tarps. Owners who fitted it as a replacement roof for a 10×10 outdoor dog kennel report it has survived “several storms already with no problems” and keeps the animal bone-dry inside. The material is 240 grams per square meter of HDPE (high-density polyethylene), which gives it a felt-like authority you do not get from a flimsy blue tarp.
Here is a real caveat: several buyers report that the grommets (metal ring holes) on their unit arrived slightly bent — not unusable, but you may want to flatten them with pliers before tensioning. Also, the dimensions run about 3-4 inches narrower than advertised: a 10-foot side measures 9’8″. If your installation has zero tolerance for exact fit, factor that in. That said, at 4.7 stars over a strong following of owners, the consensus is that you get “great quality” and “great price” for a tarp this sturdy.
What stands out
- Heavy 5.3 kg fabric with a 15×16 weave count — the densest weave among the 16 mil picks, meaning more tear resistance
- Double-hemmed, heat-sealed edges with plastic corner caps for extra tear resistance
- Rated for both backpacking and emergency preparedness, not just light camping
The fit note
- Grommets sometimes arrive bent — a small tool fix before installation is wise
- Actual dimensions are roughly 3-4 inches short on each side, so measure your space first
Best suited for: permanent or semi-permanent installations like a kennel roof, hay storage, or a job-site cover where the extra fabric weight is an asset.
Not for you if: your project requires an exact 12×20 fit down to the inch, or you don’t want to wrestle with heavy material for a temporary cover.
2. Pattiumo Tarp Waterproof 12 X 20 FT 16 Mil Heavy Duty Tarp
The 4.6-star crowd favorite that earns trust by surviving six months on a farm roof without tearing.
What wins people over is that this tarp does not fail when the weather turns. The 16 mil thickness and the HDPE (high-density polyethylene, a strong plastic weave) make it feel “very well made” and “thick material,” according to owners. Buyers have held it as a roof for farm animals for six months straight and report coming away “totally impressed” — no tears, no sagging, no letting the rain in. The reinforced edges are double-hemmed (folded twice) and heat-sealed, with a PP nylon rope running through the hem so the entire border resists pulling out under tension.
The grommets (metal ring holes for ropes) are rustproof aluminum, placed every 23.6 inches. This spacing is generous enough to work with most ropes and bungee hooks. One honest trade-off: at 5 pounds, this is not an ultralight tarp you drape over a picnic table in ten seconds — it has heft, and owners note it feels “slightly heavy,” which is exactly what you want when the job is covering a carport or a pile of hay. The dual-sided design lets you face the silver side up in summer to reflect heat (so things underneath stay cooler) and the black side up in winter for insulation.
By the numbers, this is the most positively reviewed option in the group, with owners consistently singling out durability (57 mentions) and quality (46 mentions) as its strongest traits. Across nearly a thousand ratings, it holds a 4.6-star average, making it the safest bet if you just need one tarp that will work.
Why owners trust it
- 16 mil thickness that owners call “very thick” — handles heavy rain and high tension without tearing
- Double-stitched, rope-reinforced hems so the tarp does not rip at the edges when tied tight
- Rustproof aluminum grommets every 23.6 inches for easy, secure tie-downs
The honest trade-off
- The material is heavy — carrying a folded 12×20 up a ladder takes two people
- Some owners note that long-term UV exposure will eventually cause brittleness, which is normal for any polyethylene tarp
Reach for this if: you need a tarp that can handle daily weather exposure on a barn, a carport roof, or animal shelter — the consensus is this one holds up.
Think twice if: you only need a light cover for a weekend campout; the 16 mil weight is overkill for one-time use.
3. Kesfitt 16 Mil Heavy Duty Waterproof White Tarp, 12×20 ft, 100% Virgin Polyethylene
A white 16 mil tarp that reflects sunlight to keep things cooler underneath, with a tighter 15×17 weave than the Pattiumo CSCRI tarp.
This tarp goes toe-to-toe with the 16 mil crowd on durability but adds an unusual benefit: it is white. That white surface reflects sunlight to reduce heat buildup underneath, making it a smart choice for covering a chicken run, a pool, or outdoor furniture you do not want roasting. The weave (plastic strand density) is 15×17 — a slightly tighter weave than the first pick’s 15×16 — and the fabric weighs 6.5 oz per square yard. Owners who used it as a composting pile cover for a horse paddock report it showed “minimal wear” after nearly a year, even though horses walked on it without damage. Another owner swapped out a cheap tarp on a chicken run and says the Kesfitt “fits perfectly” across the full roof.
On the mixed side, “size” appears frequently in the feedback — not because the tarp is smaller than advertised (the finished size is confirmed at 12×20 ft), but because some buyers expected the dimensions to orient differently between width and length. Check your own installation: the item dimensions run 192″L x 144″W, meaning the 12-foot side is the width. If your setup expects the tarp to lay a different orientation, measure twice. The grommets (metal ring holes) are rust-resistant metal every 23.6 inches, with reinforced plastic corners, and owners consistently praise the quality (108 mentions) and heavy-duty feel (74 mentions) as the top talking points.
Why it stands apart
- White surface reflects light — keeps covered areas cooler and looks cleaner than standard silver/black tarps
- 15×17 weave count is the tightest of any pick here, meaning better resistance to punctures
- Described by owners as “super heavy duty thickness” that held up under horses for a year
The orientation note
- The 12-foot side runs 144 inches wide — verify your installation’s orientation before ordering
- A few owners note the white surface shows dirt more quickly than silver or green tarps
Choose this for: projects where you want bright, clean coverage — a white pergola top, a pool cover that does not heat the water, or a visible animal shelter.
Pick something else if: you need camouflage or a ground tarp that hides mud splatter.
4. Bluyard Tarp Waterproof 12×20 Ft Heavy Duty Tarp Thicker 16 Mil Large Tarps
The one that actually measures 12×20 when you unroll it — a finished-size specialist with brass grommets, unlike the CSCRI which runs 3-4 inches short.
If you have been burned by a “12×20″ tarp that was actually 11’8” on one side, this Bluyard model is built to solve exactly that pain. The brand explicitly markets it as a “finished size” tarp, and owners confirm the full dimensions are accurate. The construction uses a 15×17 weave count and weighs in at 8 oz per square yard with 1000 denier yarn (a thick, strong thread) — a strong specification that explains why owners call it “heavy-duty material” that is “light but tough.” One buyer covered a 16-foot boat with it and reported it held up “like new” after half a year, while another noted that it handles “direct sun daily without deterioration.”
The tough spot in the feedback is durability: some owners mention that the tarp can tear on the edges if over-tensioned. The material is thick (16 mil) but HDPE (high-density polyethylene) is not elastic under extreme strain — so you should avoid cranking it drum-tight against sharp corners. The grommets (metal ring holes) are brass (not steel), spaced every 23.6 inches, and the edges are double-hemmed with heat sealing and a poly rope inside for reinforcement. The brand also backs it with a 12-month after-sales service, which is a stronger guarantee than most tarps carry.
What it does best
- True finished size — you get a full 12×20 ft, no surprises on length or width
- Brass grommets at 23.6-inch spacing and reinforced plastic corners for secure tie-downs
- 100% virgin polyethylene with a UV-resistant layer, holding up to constant sun exposure
The handling note
- HDPE edges can tear if overtightened against sharp metal or wood — install with gentle tension
- At 9 lb, it is moderately heavy to lift into place alone on a tall structure
Ideal if: you need exact coverage dimensions for a boat, camper, or construction pile and cannot afford a few inches of shortage.
Consider another if: you need to pull the tarp very tight across a sharp ridge and need maximum edge tear resistance.
5. RAINDEWAY 12 Mil Heavy Duty White Tarp 12×20 Feet
A 12 mil tarp with grommets every 17.7 inches — the tightest spacing of any pick here, beating even the GUARD SHIELD’s 18 inches, so you get more tie-down points in windy spots.
If you do not need the full 16 mil mass but still want a tarp that will not let you down, the RAINDEWAY white tarp offers a smart middle ground. It is 12 mil thick (0.012 inches) with a 14×14 weave count and weighs 6 oz per square yard — less fabric than the 16 mil picks, but still far tougher than the cheap blue tarps that often tear at the grommets. Owners use it as a pergola cover by the pool and report it “kept my mower dry in heavy rain” with no moisture seepage through the material. The tightly-woven polyethylene has a UV-resistant coating, so it holds up in direct sun without turning brittle quickly.
The unique spec here is the grommet spacing: every 17.7 inches. That is tighter than any other pick in this review (the closest competing spacing is 18 inches on the GUARD SHIELD tarp). Closer grommets (metal ring holes for ropes) mean you have more tie-down points to spread the tension evenly across the tarp, which is a real advantage if you are using it as a shade sail or covering a camper in a windy area. At 4.56 kilograms (roughly 10 pounds), it is also a bit easier to handle than the heavier 16 mil options — not lightweight, but manageable for one person. The trade-off is straightforward: you lose some brute-force puncture resistance compared to a 16 mil tarp, but for everyday coverage — firewood, tents, patio furniture — this is more than enough.
The smart surprise
- Grommets every 17.7 inches — the tightest spacing of any tarp reviewed, giving you superior wind control
- White material is UV-treated and reflects heat, ideal for shade sails and pool-side covers
- Owners praise its “sturdy grommets” and note it has no chemical smell right out of the package
The honest difference
- At 12 mil, it is 4 mil thinner than the top picks — less resistant to heavy puncture threats like sharp wood or metal debris
- Not recommended for permanent high-tension roof replacement where a 16 mil tarp would be safer
Best for: a shade cover, firewood protection, or a camper wrap where you want plenty of tie-down points without the heaviest fabric weight.
Not for: covering a sharp gravel pile or a construction site where punctures are likely.
6. GUARD SHIELD Super Heavy Duty Green/Silver Poly Tarp Cover 12×20 Feet
The 14.3-pound heavyweight champion that one owner says has held up on an above-ground pool for “two years without any leaks, tears or blowing up in harsh winds” — tougher than the 5 lb Pattiumo for extreme weather.
At 6.47 kilograms (14.3 pounds), this is the heaviest tarp in the group, and owners use it for the toughest jobs. One buyer replaced two previous pool covers with this one and reports it has sat on an above-ground pool for two years “without any leaks, tears or blowing up in harsh winds.” That kind of track record is what earns this pick its spot. The 16 mil thickness is backed by a rope-in-hem construction (a rope sewn into the edge for strength), rustproof aluminum grommets (metal ring holes) every 18 inches — tighter than the 23.6-inch standard — and heat-sealed seams.
The dual-sided green/silver design lets you choose the look, but the green side is what most owners prefer for blending into yard setups. The grommet quality generates some mixed feedback: most praise it, but an occasional unit arrives with a missing or misaligned grommet (not common, but worth checking your tarp right after delivery). If you are covering a pool, a sandbox, or a boat against hurricane season winds, the tight 18-inch grommet pattern and the sheer fabric weight make this the most wind-resistant tarp in the lineup. The 4.6-star rating across a large number of owners is a strong sign that the good units far outnumber the occasional defect.
What makes it a heavyweight
- 16 mil with rope-in-hem construction and grommets every 18 inches — the tightest spacing among the 16 mil picks
- Owners mention two years of continuous outdoor use on a pool without leaks or tears
- Heat-sealed seams for waterproof integrity in rain and snow
The small quality risk
- A small number of buyers mention missing grommets on arrival — inspect your tarp promptly
- The 14.3-pound weight is the heaviest in the group; hoisting it onto a tall structure requires a helper
Grab this for: pool covers, boat covers, and any job where wind has destroyed your previous tarps — the extra weight and tight grommets make a measurable difference.
skip it if: you need a lighter tarp for easy single-person setup or temporary weekend camping.
Understanding the Specs
Mil Thickness & Weave Count
A tarp’s “mil” number tells you the thickness of the plastic sheet — 1 mil equals one-thousandth of an inch. For a 12×20 heavy-duty tarp, 16 mil is the benchmark for serious weather protection. But thickness alone is not the whole story. The weave count (like 15×17) refers to how many strands of polyethylene fiber run in each direction per square inch. A higher number like 15×17 means the fibers are packed tighter, creating a denser, more tear-resistant sheet. A 16 mil tarp with a 15×17 weave will resist punctures and UV wear better than a 16 mil tarp with a looser 14×14 weave.
Grommet Spacing
Grommets are the metal-reinforced holes along the edges where you tie your rope or hook your bungee cord. The spacing standard in this category is roughly every 23 to 24 inches. A tighter spacing — like 18 inches on the GUARD SHIELD tarp or 17.7 inches on the RAINDEWAY — gives you more anchor points. This is especially important if you live in a windy area, because each tie-down point shares the load, reducing the chance that a single grommet tears out. All tarps in this review use rustproof aluminum or brass grommets, which will not corrode after a season of rain.
FAQ
Will a 12×20 tarp fit over my 10×10 kennel or 16-foot boat?
What is the difference between a “finished size” and a “cut size” tarp?
How long will a 16 mil tarp last outdoors in full sun?
Can I use a white tarp for pool cover or will it heat the water?
Is 16 mil always better than 12 mil for heavy-duty use?
How do I store a heavy-duty tarp when not in use?
Can I use a 16 mil tarp as a permanent roof replacement?
What is the best way to tie down a large tarp in wind?
Final Thoughts: The Verdict
Across the board, the 20 x 12 heavy-duty tarp winner is the Pattiumo 16 Mil because it earns the most owner trust — it is thick, UV-resistant, and owners consistently praise its durability after months of outdoor exposure. If you want a tarp that starts with an accurate finished size and uses brass grommets, grab the Bluyard. And for the toughest wind resistance — especially over a pool or boat — the GUARD SHIELD with its tight 18-inch grommet spacing is the one to reach for.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, KitchPrep earns from qualifying purchases. This does not affect which products we feature.
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