20 by 40 ft Heavy Duty 20 Mil Tarp Cover - Waterproof UV Resistant

In this review the reviewer evaluates the Core Tarps Extreme Heavy Duty 20 Mil tarp in the 40 x 60 green/black finish and concludes it is a practical, heavy-duty cover for outdoor protection; the single biggest reason to consider it is the combination of thick, 100% virgin polyethylene construction and reinforced edges that make it suitable for roof patches, boats, patio furniture or camping shelters. The review is aimed at homeowners and outdoor users who want a dependable waterproof and UV resistant tarp without surprises in finished size.

Key Features

• Finished size: The tarp is sold at its full stated dimensions so buyers receive the full 40 x 60 coverage rather than a smaller finished piece.
• 100% virgin polyethylene: Made from non-recycled material for a thicker, more tear-resistant sheet that resists rot and breakdown in wet conditions.
• Reinforced edges: Strong hems around the perimeter reduce fraying and help the tarp maintain shape under tension when tied down.
• Metal grommets every 18 in: Metal eyelets spaced regularly make it easy to secure the tarp with rope or bungee cords for reliable tie-downs.
• Weatherproof performance: The material is waterproof and UV resistant so it can be used year-round in sun, rain or snow without immediate degradation.

Who It's For

This tarp is best for homeowners, DIYers and outdoor enthusiasts who need a robust, multiuse cover for short-term or seasonal protection. It works well for roof patching, covering boats or pools, protecting patio furniture, or creating a makeshift shelter when camping, where thicker material and reinforced edges matter.

Those who need a permanent roofing membrane, a custom-fitted cover, or ultra-heavy industrial tarpaulins with specialized coatings should look elsewhere; similarly, buyers who expect grommets to never fail under extreme, constant stress should consider hard-mounted solutions.

Pros & Cons

Pros

• Very thick, heavy feel from 100% virgin polyethylene gives strong water and tear resistance for general outdoor use.
• Reinforced edges and a 16 x 16 weave count help the tarp resist fraying and hold up under tension.
• Grommets every 18 in make securing the tarp straightforward for many common tie-down needs.
• UV resistant and waterproof construction allows year-round outdoor use in varied weather.

Cons

• Some customers report grommets can tear out under very heavy loads or prolonged wind stress, so additional reinforcement may be needed for extreme conditions.
• The actual thickness can vary slightly between batches, so exact feel may differ from one tarp to another.

Specifications

Brand	Core Tarps
Finished size	40 x 60 ft
Material	100% virgin polyethylene
Thickness	20 mil (may vary slightly)
Weave count	16 x 16
Grommet spacing	Every 18 in with metal grommets
Color	Green/black

Our Verdict

The Core Tarps 20 mil 40 x 60 tarp is a solid value for anyone needing heavy, multipurpose outdoor protection; its virgin polyethylene and reinforced edges make it a reliable temporary cover for roofs, boats and patio furniture, though buyers should plan to inspect and reinforce grommets if it will face continuous heavy wind or load. For the price it delivers durable weatherproof and UV resistant protection for seasonal or emergency use.

Frequently Asked Questions

Is the size the finished dimension?
Yes, the tarp is sold at its finished size so the 40 x 60 measurement is the actual coverage you receive.

Will the grommets hold in high wind?
Grommets are metal and spaced every 18 in, but some users report tearing under sustained heavy loads, so adding reinforcement at tie points is recommended for extreme conditions.

Can this tarp be left outside year-round?
The tarp is waterproof and UV resistant and can be used year-round, though prolonged exposure and severe conditions will eventually cause wear.