Industrial Tarps

Heavy duty truck tarps should be constructed of the strongest poly material.
Commercial operations often require heavy duty, long lasting tarp
covers, capable of withstanding Arctic cold or blazing tropical sun, and able to
resist abrasion or chafing from wind and penetration by rain or snow. If
you are looking for truck tarp covers, machinery or lumber tarpaulins, hay tarps, or any other kind of durable, heavy duty tarp cover, you need to learn which one is the right tarp for you.
Truck Tarps
Heavy duty poly truck tarps should be constructed of the strongest
polyethylene material — 6 oz per square yard or more, with at least 1200
denier and a high mesh count. They should be treated with UV coating, and
doubled or triple layered at the seams and attachment points. Edges should
have a bolt rope for added strength. The attachments should be sewn nylon
straps with heavy D-rings, or extra heavy duty grommets. Straps tend to last
longer without stressing the surrounding poly tarp fabric.
Canvas can also be used to construct truck tarps, and again it should be
heavy duty canvas – #4 duck would be adequate for a super heavy duty truck
tarp. The most wear occurs around the edges and at attachment points, so
those should be double or triple reinforced with heavy duty nylon straps
stitched on with strong, corrosion resistant D-rings. Grommets can be used
on heavy duty truck tarpaulins, but will pull out easier and deform the
canvas material more than strap attachments.
Lumber tarps for trucking are specially designed to cover stacks of lumber up to 8 feet high on a truck bed. Lumber tarps generally come in 2 or 3 pieces; a single large tarp would be quite heavy and difficult to apply. Lumber tarps are important for trucking to protect the lumber from rain and the damaging UV rays of the sun.

Machinery tarp covers that don't travel can use a lighter weight canvas or poly tarp.

Hay tarps protect hay from moisture and UV rays.
Lumber and Machinery Tarp Covers
Commercial operations needing to cover lumber or machinery that is not
in transit can use lighter weight canvas or poly tarp covers. Canvas or
polytarp machinery covers are made with medium weight material
with UV coating on both sides. Lumber tarps need to be particularly
resistant to tearing and abrasion, and are made of heavy canvas or 1200
denier 6.5 ounce per square yard polyethylene tarpoulin material.
Hay Tarps
Hay tarp covers can protect hay from soaking up large amounts of rain or melting
snow or ice. Water can cause hay to rot, or to grow bacteria and fungi which
can be harmful to livestock or humans. Heavy duty UV protected hay tarps
also protect hay from excessive drying in the sun, which causes hay to
become brittle and difficult to handle.
Because they need to sit out in the elements for months on end, enduring sun, wind, and precipitation, hay tarps must be extra thick, water resistant, and must have a quality UV coating to
protect them from degrading in the sunlight. Heavy poly tarp material of
1400 denier weighing 8.5 oz per sq yard is used for super heavy duty hay
tarps.