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When using tarpaulin to cover outdoor cargo, the size should not be determined simply by purchasing a tarp based on the cargo’s length, width, and height. If the tarpaulin is too small, the top or sides of the cargo may remain exposed, allowing rainwater, dust, and sunlight to come into direct contact with the cargo. If the tarpaulin is too large, excessive overhang may occur, making it difficult to tighten and causing water to accumulate. During transportation, the increased wind exposure may also lead to greater movement. Therefore, when determining the size of tarpaulin for covering outdoor cargo, it is necessary to first measure the actual length, width, and height of the cargo, and then calculate the required size based on the covering method, overhang length, fixing positions, and cargo shape.
For regular cargo such as boxes, equipment, timber, and steel materials, size calculation is relatively simple. In addition to the area occupied by the cargo itself, sufficient length must be reserved to cover the sides, as well as extra material for tightening, tying, and securing. If the cargo has protruding components, sharp corners, or irregular structures, an appropriate amount of additional material should be added, and the contact points should be protected. Outdoor use also requires consideration of local weather and transportation conditions. The covering requirements for stationary storage differ from those for road transportation, and short-term covering differs from long-term outdoor storage. Especially in strong winds and heavy rain, the tarpaulin cannot rely solely on its own weight for fixation. It must be securely fastened with ropes, straps, hooks, or other methods. Therefore, the appropriate tarpaulin size should meet several basic requirements: “complete coverage, convenient fastening, no obvious exposed areas, and no excessive excess material.”
When measuring outdoor cargo, the actual length, width, and height should be determined first.
For a regular rectangular cargo unit, the measurements can be taken as follows:
Length L: The distance between the front and rear ends of the cargo.
Width W: The distance between the left and right sides of the cargo.
Height H: The vertical distance from the bottom of the cargo to its highest point.
If the top of the cargo includes pallets, packaging, supports, or other raised structures, their heights should also be included in the measurement rather than measuring only the main body of the cargo. For example, if a batch of cargo is 5 meters long, 2 meters wide, and 1.8 meters high, and a tarpaulin is used to cover the top with both sides hanging down, extra covering allowance must be added to both the length and width of the tarpaulin.
When covering outdoor cargo, the tarpaulin usually does not only cover the top. It also needs to extend down the sides of the cargo.
If the tarpaulin is expected to hang down 0.5 meters on each side, the width of the tarpaulin can be estimated using:
Tarpaulin width ≈ Cargo width + 2 × Cargo height + 2 × Overhang allowance
Similarly, if the front and rear ends also need to be covered, the length can be calculated using:
Tarpaulin length ≈ Cargo length + 2 × Cargo height + 2 × End allowance
For example, if the cargo measures 5 m × 2 m × 1.8 m, and all four sides need to be covered with a 0.5 m overhang reserved on each side:
Tarpaulin width ≈ 2 + 1.8 × 2 + 0.5 × 2 = 6.6 meters.
Tarpaulin length ≈ 5 + 1.8 × 2 + 0.5 × 2 = 8.6 meters.
When purchasing, the actual specification should also be selected according to standard fabric widths, joining methods, and fastening requirements. It is not necessary to manufacture a tarpaulin with exactly the calculated dimensions of 6.6 m × 8.6 m.
For cargo with relatively regular shapes, such as packing boxes, machinery, steel stacks, and timber piles, it is convenient to calculate the tarpaulin size based on length, width, and height. If the tarpaulin is only intended to protect the top from rain, the side coverage length can be reduced. If the cargo needs to be fully enclosed, more overhang and end allowance will be required. If the tarpaulin needs to be secured near the bottom of the cargo, the overhang length should also be determined according to the tying position. If it is too short, the tarpaulin cannot be properly secured. If it is too long, it may drag on the ground and cause friction during transportation.
For cargo such as construction machinery, equipment, and irregular components, the tarpaulin size cannot be calculated only according to the maximum length and width. During measurement, the highest point, widest position, and obvious protruding components should be identified. The tarpaulin needs to cover the cargo along its contours. Therefore, the maximum overall dimensions can be used for an initial calculation, followed by the addition of an appropriate allowance. If the top of the cargo has sharp metal edges, protective padding should be installed first. Even if the tarpaulin is the correct size, pressing it directly against sharp corners may damage the PVC coating under transportation vibrations and wind pressure.
If multiple cargo units are stacked together, the tarpaulin size should be calculated based on the external dimensions of the entire cargo stack rather than measuring each individual item separately. For example, if several pallets are arranged to form an overall cargo stack measuring 6 meters long, 2.5 meters wide, and 2 meters high, the tarpaulin should be sized according to these overall dimensions. If there are large gaps between different cargo units, attention should also be paid to whether water may accumulate on the top. When necessary, the stacking arrangement can be adjusted to create a slight slope on the top, allowing rainwater to drain away naturally.
The tarpaulin needs to be secured, so the size should not be calculated based on just enough coverage. A certain amount of material should be reserved along the edges for pressing down, tying, and connecting fastening components. The actual allowance should be determined according to the cargo height, fastening method, and transportation conditions. For example, when ropes are used to secure the tarpaulin edges to a rack or vehicle body, enough edge material must be left for operation. If hooks, buckles, or other fastening methods are used, it is also necessary to ensure that the fastening points do not come into contact with sharp corners of the cargo. If the tarpaulin is only used for temporary outdoor covering near a warehouse, the allowance can be adjusted according to the available fastening conditions. If it is used for truck transportation, greater attention should be paid to edge fastening and wind exposure.
A tarpaulin is not necessarily better simply because it is larger. If the excess material is too long, the edges may drag on the ground and come into contact with the road surface, tires, or other vehicle components during driving. An excessively large tarpaulin may also create a greater wind-exposed area, increasing the tension placed on the fastening points. Therefore, the tarpaulin should completely cover the cargo while retaining sufficient allowance for fastening, rather than increasing the dimensions without limitation.
Usually, no. Length × width only calculates the top surface area of the cargo. If the sides also need to be covered, the cargo height and overhang length must be included.
There is no fixed dimension suitable for all cargo. It should be determined according to the cargo height and fastening method. Generally, the tarpaulin should cover the sides and have edges that can be secured conveniently. During cargo transportation, the overhang should also be prevented from becoming so long that it drags on the ground.
An appropriate allowance should be considered, but protecting the sharp corners is even more important. Corner guards or soft protective materials can be installed at sharp points to prevent damage caused by long-term pressure and friction.
An appropriate amount of extra material should be reserved for coverage and fastening, but bigger is not always better. For long-term outdoor use, drainage, ventilation, fastening, and the weight of the tarpaulin itself must also be considered. An excessively large tarpaulin may cause water accumulation and increase the pressure on fastening points during strong winds.
Determining the size of tarpaulin for covering outdoor cargo requires using the actual shape of the cargo as the basis while reserving sufficient space for coverage and fastening. During measurement, it is not enough to record only the length and width of the cargo. The cargo height, raised sections on the top, side overhang, and front and rear coverage areas must also be included in the calculation. For regular cargo, the size can be estimated based on length, width, and height. For irregular cargo such as machinery, steel stacks, and timber piles, the overall maximum external dimensions should be measured. After determining the tarpaulin size, it is also necessary to check whether the edges can be conveniently secured with ropes, straps, buckles, or other fastening components. This helps prevent insufficient coverage, edges dragging on the ground, or excessive excess material. Through accurate measurement, reasonable calculation, and proper installation, problems such as rainwater penetration, tarpaulin wear, and loosening in strong winds can be reduced, making PVC tarpaulin more suitable for the actual covering needs of outdoor cargo.
