Custom round tarps and heavy duty circular PVC covers, specified by finished diameter, material, perimeter reinforcement and anchoring layout. For industrial equipment, agricultural storage, mound protection, pool debris covers and wholesale programs.
DERFLEX original material photographs · round layout illustrated above
Unlike rectangular tarps, a round cover must distribute fastening points around a curved perimeter. The finished diameter, overlap, hem construction and tie-down spacing should be agreed before production—not estimated from an untrimmed fabric blank.
DERFLEX supports made-to-measure tarp fabrication in addition to its established custom tarp manufacturing program. This page focuses specifically on circular geometry and its effect on coverage, welding, hardware and purchasing decisions.
Material-system illustration: the polyester base carries tensile load while the coated surfaces provide waterproof protection. Final construction varies by grade.
Waterproofing, repeated handling and ventilation call for different tarp structures. Not every circular cover should use the same fabric.
Reinforced PVC-coated polyester is a practical direction for reusable outdoor circular covers. Discuss coating weight, welded seams, cleanability, UV exposure and abrasion where durability matters.
Best fit
Equipment tops, industrial circular platforms, long-use outdoor covers and specified OEM programs.
For base fabric structure and finish options, see DERFLEX PVC tarpaulin materials.
Woven polyethylene tarps can be economical for seasonal or light-duty coverage. Evaluate weight, UV treatment, seam construction and reinforcement rather than assuming all PE sheets are identical.
Best fit
Temporary covering, distribution programs and cost-sensitive applications with controlled handling.
Compare material families in the tarp material selection guide.
Coated mesh allows air and water to pass through. It can be useful for shade, containment or wind reduction where ventilation is essential. Mesh should not be specified as a waterproof roof.
Best fit
Ventilated agricultural uses, selected outdoor enclosures and shade-oriented projects.
The mesh openness, attachment geometry and required wind behavior must be assessed together.
The number buyers give as “size” is often the size of the object, not the required diameter of the finished circular cover. These are different dimensions.
Use this relationship for a flat circular area where the tarp extends beyond the object on both sides. Both dimensions must use the same unit.
Add the intended side drop and fastening allowance on both sides to the horizontal top span. Curved or domed shapes may require a shaped pattern or on-site measurement.
Always identify whether the dimension is the finished outside diameter after hems, not the cutting blank.
Suppose the equipment top measures 10 ft across, and the tarp needs 1 ft of perimeter allowance on every side.
For tie-downs with a target spacing no greater than 24 in (2 ft) along the perimeter, at least 19 evenly spaced grommets are required geometrically: ceil(37.7 ÷ 2) = 19. Use a practical symmetrical count (for example, 20) when the anchor positions allow. Actual spacing and reinforcement still depend on loads and anchor locations.
| Finished diameter | Radius | Approx. circular area | Approx. perimeter | Grommets for ≤24 in pitch* |
|---|---|---|---|---|
| 6 ft | 3 ft | 28.3 sq ft | 18.8 ft | 10 |
| 8 ft | 4 ft | 50.3 sq ft | 25.1 ft | 13 |
| 10 ft | 5 ft | 78.5 sq ft | 31.4 ft | 16 |
| 12 ft | 6 ft | 113.1 sq ft | 37.7 ft | 19 |
| 16 ft | 8 ft | 201.1 sq ft | 50.3 ft | 26 |
| 20 ft | 10 ft | 314.2 sq ft | 62.8 ft | 32 |
*Indicative arithmetic count = ceiling(perimeter ÷ 2 ft). Does not replace anchor mapping, load assessment, manufacturing approval or grommet pull-out testing. Use equal arc spacing, not equal straight-line distances between points.
A strong tarp can still fail where perimeter load is concentrated. Circular covers need an engineered load path all the way around the rim.
Specify the hem width and whether the edge uses folded PVC, compatible webbing, an enclosed rope or additional reinforcement strips. The purpose is to distribute tension instead of transferring it into a narrow cut edge.
On a circular perimeter, pitch should be defined as the distance along the arc. Map grommets to usable anchors; equally spaced eyelets may be inappropriate if the equipment anchor points are not symmetrical.
Large diameters may require more than one roll width. Plan panel joints and weld overlaps to keep critical tie-down zones clear wherever practical. Confirm waterproof seam details with the approved sample.
For hardware-specific construction examples, see the DERFLEX guide to tarp edge reinforcement. A standard 24-inch pitch may be a useful reference in retail listings, but it is not a universal safe spacing for every diameter or wind condition.
The shape may be the same; the service conditions are not. Buyers should match the material and fixing method to the underlying asset.
| Application | Priority | Recommended specification direction | What to confirm |
|---|---|---|---|
| Industrial round machinery / tanks | Rain protection, abrasion and fastening | Custom waterproof PVC, localized wear pads, reinforced perimeter and planned drain slope | Top span, protrusions, height, anchor map and safe clearance from hot equipment |
| Baseball pitcher's mound | Quick placement and field protection | Flexible waterproof cover with manageable weight and closely reviewed edge anchors | Mound contour, turf protection, quick-removal process and wind procedure |
| Hay bale / round agricultural storage | Outdoor UV, wind and condensation control | Weather-resistant circular top cover with adequate side drop and secure fastening | Bale diameter, stack height, ventilation, drainage and storage duration |
| Round pool debris covers | Debris exclusion and perimeter attachment | Specified waterproof cover with cable/strap layout only where appropriate for the pool system | Actual pool diameter, wall/top rail type, overlap, drain management and local safety rules |
| Circular stockpiles / open pits | Weather exposure, movement and access | Reinforced cover, load-appropriate attachment and design for slope, runoff and removal | Topography, height, drainage, wind, equipment access and project engineering requirements |
For asset-specific weather protection and moisture concerns, compare DERFLEX's outdoor storage tarp selection guidance before choosing fabric weight.
Specify the finished cover, not only a material name. The options below are project discussion directions; they are not a promise of every diameter, GSM or accessory as a stock item.
| Parameter | Configuration / quotation basis | Buyer note |
|---|---|---|
| Product type | Finished round tarp, circular PVC cover, custom cut circular panel or OEM pack | Confirm actual use and whether a flat or shaped cover is required |
| Finished diameter | Custom to approved drawing / pattern | State finished outside diameter after perimeter finishing |
| Material | PVC coated polyester, PE woven tarp or mesh subject to suitability and availability | Waterproof and breathable materials solve different problems |
| Weight / strength | Project-selected GSM, base yarn, weave and coating structure | 450–650 and 650–900 gsm are useful PVC discussion bands, not fixed round-tarp SKU limits |
| Color / finish | Available color, matte / gloss and optional project-specific surface treatments | Approve a color sample for production matching |
| Waterproof joints | Appropriate welding or seaming design for chosen substrate | Large diameter covers may contain panel joins |
| Edge construction | Folded hem, webbing, rope edge or local reinforcement options | Specify load transfer and durability expectations |
| Fixing hardware | Metal grommets, eyelets, D-rings, tabs, straps or custom anchor layout | Provide a dimensioned grommet / anchor map |
| Performance requirements | UV, cold-flexibility, abrasion or FR directions by specified test and project need | Any compliance or certification must be confirmed for the exact production grade |
| Supply format | Bulk finished covers, OEM private-label packs, cut panels or coated fabric rolls | MOQ, price, lead time and packaging subject to quotation |
The verified DERFLEX material photographs at the top of this page show coated fabric surfaces. These separate technical illustrations explain two fabrication decisions that photographs alone often cannot make clear.
Illustrations show design principles, not certified test results or representations of a standard stock product. DERFLEX's tarp fabrication and converting capabilities provide more information for production planning.
Confirm object geometry, finished diameter, drop, overlap, environment, anchors, quantity and use cycle.
Select fabric, pattern, roll panel joins, hem depth, reinforcement and hardware positions.
Approve color, dimensions, grommet positions, seam quality and any agreed material or performance tests.
Agree folding or rolling, labels, packing format and documented specification for repeat orders.
Quick answers to the sizing, material and purchasing questions that matter most to circular-cover buyers.
A round tarp is cut to a circular perimeter and specified by diameter. Its edge reinforcement and eyelets are distributed around an arc, not along four straight edges. A rectangular tarp is usually easier to produce as a simple sheet, but may leave excess folds over circular equipment.
DERFLEX supports made-to-specification tarp programs, including round and irregular covers. Provide the required finished diameter, application, edge design, quantity and drawing. Available fabrication and order terms are confirmed through quotation.
PVC-coated polyester is a useful heavy-duty option for reusable outdoor protection because it combines a reinforced textile base with a waterproof coating and weldable fabrication. PE may suit lighter temporary use; mesh is not suitable when water blocking is essential.
Calculate the perimeter as π times the finished diameter, then divide by the planned maximum arc spacing and round upward. For a 12 ft diameter and 2 ft maximum pitch, the geometric minimum is 19. Adjust the final count to the real anchors, wind loading and reinforced edge design.
No. The finished diameter may be larger than the available roll width. Multiple PVC-coated panels can be joined using an appropriate seam process, provided the panel layout, weld quality and final dimensions are checked against the approved requirements.
Not by default. A general round tarp can be discussed for debris or seasonal weather covering, but it is not automatically a certified safety cover. Drowning prevention, load-bearing safety and local pool rules require a purpose-designed and appropriately verified product.
Not necessarily. Hem folding, welding and edge construction affect the relationship between cutting dimensions and finished dimensions. State the required finished outside diameter and agree measurement tolerance on the fabrication drawing.
Price depends on diameter, material and GSM, fabric yield, panel joins, edge reinforcement, hardware count, printing, quantity, packing and shipping scope. DERFLEX can quote against a completed specification; there is no universal price based on diameter alone.
Send DERFLEX your finished diameter, application, preferred material, edge and attachment details, quantity and destination. Our team can review a practical circular tarp specification for sampling or bulk OEM supply.
Quotation scope, availability, sampling and lead time are confirmed by DERFLEX for the project.