Sigman 30' x 40' Heavy Duty White Tarp - 10 mil Woven Poly

Sigman 30' x 40' Heavy Duty White Tarp - 10 mil Woven Poly

Name: Sigman 30' x 40' Heavy Duty White Tarp - 10 mil Woven Poly
Brand: Sigman
SKU: WPF030040
Price: 206.77 USD
Availability: InStock
Rating: 5.0 (12 reviews)

The 30' x 40' (about 1200 sq ft) white tarp. An extra-large white tarp for buildings, roofs, agricultural, and commercial jobs that need maximum waterproof coverage.

Brand: Sigman

Type: 10-Mil Woven Poly Tarp

SKU: WPF030040

$206.77

Shipping calculated at checkout.

True 10-mil thickness with a 14x14 weave - heavier and tougher than most white poly tarps sold online
100% waterproof woven polyethylene with UV-resistant coating on both sides
Rust-resistant grommets about every 18 in. and plastic-bar reinforced corners for secure, tear-resistant tie-downs
Big, bright white coverage for building and roof cover that still ties down and drains easily
Lead Time: 1 - 2 business days + transit time

30' x 40' | Woven reinforced polyethylene (PE) | true 10-mil | white | grommets about every 1.5 feet. The Sigman 30' x 40' white tarp is a heavy-duty 10-mil poly tarp built for building and roof cover, large event tents, and equipment and machinery. Sigman builds it from woven, reinforced polyethylene and coats both sides against UV, so it is tougher and more dimensionally honest than the typical bargain white tarp.

The white finish is the difference-maker. Unlike heat-reflective silver or light-blocking silver/black, white lets daylight through and keeps the space over buildings, roofs, and large outdoor spans noticeably brighter. On top of that the coated, woven polyethylene is waterproof, so building and roof cover stay dry while the dual-sided UV coating fights fading.

The 30' x 40' hangs and ties off easily thanks to evenly spaced grommets and plastic-bar corners, so it stays put over building and roof cover. Plan tension and drainage to avoid puddles. As a heavy-duty poly it is a smart seasonal-to-medium-term choice - step up to vinyl only for the harshest, years-long exposure.

Size: 30' x 40' (finished size; approx. 1200 sq ft coverage)
Material: Woven reinforced polyethylene (PE)
Thickness: True 10-mil (heavy duty)
Weave count: 14 x 14
Fabric weight: True 5.5 oz/yd² (ounces per square yard)
UV coating: Both sides
Grommets: Rust-resistant metal, spaced about every 1.5 ft (18 in.)
Corner reinforcement: Plastic bar
Waterproof: Yes - sheds rain and water with proper slope and tension

Applications

Overview

The 30' x 40' (1200 sq ft) white tarp. An extra-large white tarp for buildings, roofs, agricultural, and commercial jobs that need maximum waterproof coverage.

Best for

Building and roof cover; large event tents; equipment and machinery; agricultural and hay cover; lumber yards.

Not ideal for

Permanent multi-year full-sun installations in high UV areas and heavy abrasion or dragging over rough surfaces, which favor heavier 18 oz vinyl tarps.

Comparison

Vs silver tarps: white passes more light and looks cleaner, while silver reflects more heat.
Vs silver/black tarps: silver/black blocks light for shade or blackout, while white brightens the space underneath.
Vs vinyl tarps: vinyl is heavier and lasts longer in harsh UV climates, while this true 10-mil woven poly balances cost, weight, and waterproof protection for seasonal to medium-term use.
Vs standard white poly tarps: many are only 8-mil with a looser 12x12 weave and sold at cut size, while this is a true 10-mil, 14x14 weave at 5.5 oz/yd² measured to finished size — thicker material and dimensional accuracy for longer life.

Warnings

WARNING: Tarp size is finished size. A finished size tarp's actual dimensions are usually within -/+ 1 to 3 inches of its nominal dimensions.

Fast shipping
30-Day Return Period (exclude custom / special items)

Frequently Asked Questions

Is the Sigman 30' x 40' white tarp waterproof?

Yes, this 30' x 40' tarp is waterproof. As with any tarp, give it enough slope so water runs off rather than pooling.

How thick is the 30' x 40' white tarp?

This is a true 10-mil tarp with a 14x14 weave count - heavier and tougher than many white poly tarps, which are often thinner than their label suggests.

Is the 30' x 40' tarp big enough for building or roof cover?

Yes. At this size it works as a building, roof, agricultural, or large-event cover. For long-term use, support it with proper framing and keep it tensioned so it sheds water and resists wind.

Why choose a white tarp instead of silver or silver/black?

White passes more light, so it is noticeably brighter underneath and gives carports, canopies, and patios a cleaner, more finished look. Silver reflects more heat, and silver/black blocks light for shade or blackout.

Is 30' x 40' the exact finished size?

Yes, 30' x 40' is the finished size. Finished-size tarps typically measure within about 1 to 3 inches of the stated dimensions, so plan a little overlap for grommets and tie-downs.

Why does this 30' x 40' white tarp cost slightly more than some other white tarps?

This is a true 10-mil tarp with a tight 14x14 weave (about 5.5 ounces per square yard), measured to finished size. Many cheaper white poly tarps are only 8-mil with a looser 12x12 weave and sold at cut size, so they are thinner, lighter, and a few percent smaller than labeled. You are paying for thicker material and dimensional accuracy, which means better quality.

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Sigman 30' x 40' Heavy Duty White Tarp - 10 mil Woven Poly

$206.77

Available sizes

Size	Coverage	Approx. weight	Price	Link
5' × 7'	35 sq ft	1.5 lb	$7.91	View
6' × 8'	48 sq ft	2.0 lb	$10.71	View
8' × 10'	80 sq ft	3.3 lb	$16.16	View
8' × 20'	160 sq ft	6.7 lb	$29.78	View
10' × 10'	100 sq ft	4.2 lb	$19.77	View
10' × 12'	120 sq ft	5.0 lb	$23.07	View
10' × 20'	200 sq ft	8.3 lb	$36.82	View
12' × 12'	144 sq ft	6.0 lb	$27.05	View
12' × 16'	192 sq ft	8.0 lb	$37.53	View
12' × 20'	240 sq ft	10 lb	$47.29	View
12' × 25'	300 sq ft	13 lb	$56.75	View
15' × 30'	450 sq ft	19 lb	$82.12	View
16' × 20'	320 sq ft	13 lb	$57.17	View
18' × 24'	432 sq ft	18 lb	$76.97	View
20' × 20'	400 sq ft	17 lb	$72.99	View
20' × 25'	500 sq ft	21 lb	$91.23	View
20' × 30'	600 sq ft	26 lb	$104.47	View
20' × 40'	800 sq ft	33 lb	$138.57	View
24' × 24'	576 sq ft	26 lb	$101.17	View
24' × 30'	720 sq ft	30 lb	$125.37	View
30' × 30'	900 sq ft	38 lb	$156.17	View
30' × 40'	1200 sq ft	50 lb	$206.77	This size
30' × 50'	1500 sq ft	63 lb	$257.37	View
40' × 40'	1600 sq ft	67 lb	$274.97	View
40' × 60'	2400 sq ft	100 lb	$371.21	View

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Sigman 30' x 40' Heavy Duty White Tarp - 10 mil Woven Poly

Applications

Warnings

Frequently Asked Questions

Available sizes

Customer Reviews