Is the 30-mil worth the extra $82?

Yes if your enclosure faces freezing winters or strong wind, where the thicker vinyl resists cold cracking better. For mild climates the 20-mil does the same job for $115.97 at MyTarp as of November 3, 2026.

Which is better for a cold winter porch?

The 30-mil. Sigman states its thicker vinyl gives stronger cold-crack performance, and buyers report it holds up in extreme cold without cracking.

The 30-mil should last longer in cold or high-stress use because the vinyl is 50% thicker. In mild conditions the difference is smaller, and both share the same folding-crease weakness.

Can either be used on a roof?

No. Sigman says the 20-mil is for vertical use only, not horizontal load-bearing coverage where water or snow collects. Treat the 30-mil the same way.

Do they come in the same size?

Yes. Both are 8' x 10' with grommets about every 2 ft on all sides and webbing-reinforced hems. The only real differences are thickness, weight and price.

Why do buyers complain about creases?

Both ship folded, and buyers report the folds leave creases that can crack the vinyl. Ask the seller about rolled shipping before you order.

Sigman 8' x 10' Clear Tarp, 20-MIL Clear Vinyl vs Sigman 8' x 10' Clear Tarp, 30-MIL Clear Vinyl

Both are 8' x 10' clear vinyl Sigman tarps with the same grommet spacing, reinforced hems and 4.8 rating. The 30-mil costs $197.97 at MyTarp as of November 3, 2026, versus $115.97 for the 20-mil at MyTarp. Buy the 20-mil for mild-climate porch and patio curtains; pay the extra $82 for the 30-mil if you face hard freezes or heavy wind.

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