Tarps vary mainly by fabric and weight, and the right one depends on how long it stays outside and what it covers. Light woven polyethylene tarps are cheap and fine for short jobs, mid weight tarps suit covering firewood or equipment for a season, and heavy duty tarps, often with a thicker coating, suit long term covers, truck loads and roofs. Canvas and vinyl tarps are other options for specific uses. The first decision is how long the tarp needs to last outdoors.
Thickness and weave are the next choice. Thickness on this page is given in mils, and a higher number usually means a tougher tarp, but weave density and coating matter as much. Ultraviolet protection decides how long a tarp lasts in full sun, so look for that wording if it will stay out for months. Waterproof tarps are coated to keep rain out, while water resistant ones shed light rain but may let water through at seams over time. Among the 11 products that list item weight, most fall between 0.5 and 9.9 pounds, and 1.8 pounds is typical.
Size and grommets come next. Listed sizes are often cut sizes, and the finished tarp can be smaller after hemming, so buy a little larger than the area you cover. Grommet spacing decides how well the tarp can be tied down; reinforced corners and closely spaced grommets resist tearing in wind.
Before buying, check the finished size, the thickness, the coating and ultraviolet treatment, and the grommet material and spacing. Tie tarps with enough slope for rain to run off, since pooling water stretches and tears even heavy covers, and use bungee cords rather than tight rope in windy places. Brown and green tarps blend in for garden use, while white or clear tarps let light through for greenhouses and temporary shelters. Silver backed tarps reflect sun and are popular for shade.
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