20 ft x 40 ft Waterproof Tarp, Medium Duty Reversible Blue/Silver

Our review of this 20 ft x 40 ft waterproof tarp finds it best suited for homeowners and DIYers who need a large, economical protective cover for short-term outdoor or indoor use; the single biggest reason to consider it is its combination of size and practical construction that makes creating a tarp shelter or covering large items straightforward. The tarp's reversible blue/silver design, heat-sealed seams and rope-reinforced hems deliver dependable waterproofing and easy tie-down options, so it performs well as a pool cover, wood or equipment shield, or temporary car and boat cover.

Key Features

• Versatile multi-purpose use: The large cut size allows this tarp to serve as a tent cover, pool tarp, car cover, or protective sheet for furniture and building materials.
• Waterproof construction: Heat-sealed seams and an overall waterproof material keep water out and protect items beneath during rain or snow.
• Reinforced hems and grommets: Rope-reinforced hems and grommets spaced about every 3 ft make securing the tarp with rope or bungee cords straightforward and stable.
• Thick, cross-woven material: The 5 mm thickness with an 8 x 8 cross weave adds tear resistance and stiffness compared with thinner, lighter tarps.
• Arctic flexibility: The material stays more pliable in cold weather, making it easier to handle for short-term winter covers.
• Reversible color: Blue on one side and silver on the other gives options for appearance and light reflection depending on use.

Who It's For

This tarp is a good fit for backyard owners who need a large, affordable cover for seasonal tasks like protecting above-ground pools, stacking firewood, shielding a camper, or covering outdoor furniture. Contractors or campers who want a quick, temporary shelter or groundsheet will appreciate the size and the reinforced tie points.

It is not ideal for those seeking a long-term, permanent cover in high-wear environments or heavy commercial use; customers who require the absolute highest tear resistance or custom finished dimensions should look to heavy industrial-grade tarps or tailored covers instead.

Pros & Cons

Pros

• Large coverage and reversible color make it flexible for many outdoor projects.
• Heat-sealed seams and rope-reinforced hems provide dependable waterproof protection.
• Grommets approximately every 3 ft simplify secure fastening and anchoring.
• Thicker 5 mm, 8 x 8 cross-woven material offers improved tear resistance over thin tarps.

Cons

• Finished size is smaller than the cut size (about 6 in shorter per side), so measure carefully before purchase.
• Some buyers report mixed impressions of long-term sturdiness under sustained heavy wind or abrasion.

Specifications

Brand	Moose Supply
Cut size	20 ft x 40 ft
Finished size (approx.)	9 ft 6 in x 11 ft 6 in (example finished size noted)
Thickness	5 mm
Weave	8 x 8 cross weave
Grommet spacing	About every 3 ft
Features	Heat-sealed seams, rope-reinforced hems, reversible blue/silver

Our Verdict

This large waterproof tarp is a practical value option for homeowners, campers, and DIYers who need a sizable, temporary cover that is easy to secure and reasonably durable. It offers good waterproofing, reinforced tie points, and a thicker cross-woven material for better tear resistance than economy tarps; buyers who need a permanent commercial-grade solution or exact finished dimensions should consider heavier industrial alternatives.

Frequently Asked Questions

Is this tarp fully waterproof?
Yes, the tarp uses heat-sealed seams and waterproof material to keep water out for short-term protection.

How often are grommets placed?
Grommets are placed approximately every 3 ft to aid with tying down and securing the tarp.

Will the tarp stay flexible in cold weather?
The product advertises arctic flexibility, meaning the material remains pliable for handling in lower temperatures.