Why Geometry Matters
Choosing between ball-shaped and hexagonal floating covers is not a cosmetic decision — it is an engineering one. The shape of each modular unit directly affects four critical performance variables:
- Surface coverage percentage — Spheres cannot tile a flat surface without gaps. Even in the tightest packing arrangement, ball covers leave approximately 9% of the water surface exposed — a diamond-shaped gap at every contact point that lets sunlight through. Hexagonal tiles interlock with minimal gaps, achieving 97–99% coverage.
- Wind resistance — A sphere's curved profile catches wind differently than a flat-topped hexagonal tile. Pre-loaded hex tiles (like Hexprotect® AQUA) ship with water in their internal chambers at 100%–300% of basic tile weight, creating a permanent anchoring effect that balls cannot replicate.
- Thermal insulation — Hexagonal tiles can be manufactured with insulating foam cores (R-4 to R-17+), while hollow spheres offer limited insulation (R-2) due to their geometry.
- Cost per unit of coverage — Ball covers are not automatically cheaper. On the published AWTT price list both families sit in the same $1.75–$2.50/sq ft non-insulated tranche, and it takes 10 spheres versus 2.62 Hexprotect tiles to make one square foot. The meaningful comparison is coverage per dollar (91% vs. 97–99%) and freight: a 53-ft trailer carries about 8,931 sq ft of Hexprotect AQUA.
This misconception drives a pattern AWTT sees repeatedly in its sales files: buyers arrive asking for "shade balls" on the assumption that spheres are the budget option, flip back to balls whenever price pressure rises, and only settle once both geometries are quoted for the same square footage. In one 2025–2026 evaluation, a buyer switched between ball and tile quotes more than once before the side-by-side numbers ended the debate — the tile delivered 99% coverage against 91% without a price premium.
Where Each Geometry Performs Best
Different site conditions and application requirements favor different cover geometries. Understanding these trade-offs early in the selection process prevents over-engineering sheltered sites and under-specifying exposed ones.
Ball covers are well-suited for:
- Sheltered ponds and lagoons — Sites protected by berms, tree lines, or buildings where wind is not a primary concern.
- Budget-constrained projects — When capital cost per square foot is the binding constraint and maximum coverage percentage is not required.
- Irregularly shaped or obstructed ponds — Spheres flow freely around aerators, mixers, baffles, and other in-pond equipment with no installation adjustment.
- Temporary or seasonal deployments — Balls can be rapidly poured onto a surface and removed by pumping or netting.
Hexagonal tile covers are well-suited for:
- Wind-exposed reservoirs and ponds — Coastal, desert, and high-plains sites where sustained winds exceed 35 MPH.
- Potable water reservoirs — Where 99% surface coverage is needed to block sunlight and suppress algae that produce disinfection byproducts.
- Heated tanks and digesters — Where thermal insulation (R-4 to R-17+) is required to reduce heat loss and energy costs.
- Wastewater and odor control — Where high coverage percentage is needed to contain VOC emissions and odors.
- Applications requiring maximum evaporation reduction — Where every percentage point of coverage translates to measurable water savings.
Side-by-Side Comparison: Ball vs. Hexagonal Geometry
The following table compares ball-shaped and hexagonal tile floating covers across the key engineering and operational criteria that drive cover selection decisions.
| Criterion | Ball Covers (Armor Ball Family) | Hexagonal Tile Covers (Hexprotect / Rhombo) |
|---|---|---|
| Surface Coverage % | 91% (sphere packing limit) | 97–99% (interlocking tiles) |
| Wind Resistance | Sheltered (Armor Ball), 75 MPH water-ballasted (Armor Ball AQUA 275) | Sheltered (SLIM), 130 MPH (Rhombo 66), 90+ MPH (Rhombo 189), 130+ MPH (AQUA) |
| Units per Square Foot | 10 spheres (100 mm diameter) | 2.62 tiles (220 mm Hexprotect); 10 modules (114 mm Rhombo 66) |
| Insulation (R-Value) | R-2 (air-filled hollow sphere) | R-1 (SLIM), R-2 (AQUA), R-4 (Rhombo 66), R-8 (Rhombo 189), R-17+ (MAX R) |
| Shape Interlocking | None — spheres rest against each other by gravity | Tongue-and-groove or nesting geometry — tiles lock together on the surface |
| Installation Method | Pour onto water surface — self-distributing | Place tiles onto water surface — self-interlocking |
| Repair / Replacement | Scoop and replace individual balls — seconds per unit | Lift and swap individual tiles — minutes per unit |
| Weight per Unit | ~50 g (Armor Ball), ~275 g filled (AQUA 275) | Varies by model: 0.3–3.5 kg depending on insulation |
| UV Protection | UV-stabilized HDPE, 25+ year lifespan | UV-stabilized HDPE, 25+ year lifespan |
| Best For | Budget applications, sheltered sites, temporary deployments | Wind-exposed sites, potable water, insulation, maximum coverage |
Decision Guide: When to Choose Each Geometry
Choose ball covers when:
- Your site is sheltered — sustained winds below 35 MPH, with berms or tree lines providing protection.
- Budget is the binding constraint — you need basic evaporation reduction and algae suppression at the lowest capital cost.
- 91% coverage is acceptable — your application does not require the last few percentage points of surface coverage.
- You need rapid deployment and removal — ball covers pour on and pump off faster than any tile system.
Recommended products: Armor Ball® for sheltered sites, or Armor Ball® AQUA 275 for wind-exposed sites (rated at 75 MPH). For the ball-side deep-dive, see the ball cover vs. hexagonal tile cover comparison on the Armor Ball® resource site.
Choose hexagonal tile covers when:
- Wind exposure exceeds 35 MPH — pre-loaded hex tiles provide reliable wind resistance that hollow, unballasted spheres cannot match, and their interlocking mat stays cohesive where free-floating units drift.
- You need 97–99% surface coverage — for algae prevention, odor containment, or maximum evaporation reduction.
- Thermal insulation is required — only hexagonal tiles are available with foam-core insulation up to R-17+.
- Potable water certification is required — Hexprotect® AQUA is available in NSF/ANSI food-grade HDPE.
- Long-term total cost of ownership matters more than upfront price — higher coverage reduces water loss, chemical use, and energy costs over the 25+ year lifespan.
Recommended products: Hexprotect® SLIM for sheltered high-coverage applications, Hexprotect® AQUA for wind-exposed and potable water sites, Hexprotect® MAX R for maximum insulation, Rhombo Hexoshield® for maximum evaporation reduction + wind resistance, or Rhombo Hexoshield® 189 for high insulation with strong wind resistance.
Why AWTT for Both Geometries
Most floating cover suppliers specialize in a single product geometry — either balls or tiles. AWTT is the exclusive North American distributor of both the Armor Ball family (spherical covers) and the Hexprotect / Rhombo Hexoshield family (hexagonal tile covers). This means our engineering team can evaluate your site conditions objectively and recommend the geometry that delivers the best performance for your specific application — without a bias toward one product line.
- Full product range — 7 modular floating cover products spanning both geometries, from budget applications to extreme-wind and high-insulation requirements.
- Site-specific sizing — free volume calculations using our online calculators or direct engineering support.
- Single-source procurement — one supplier, one purchase order, one point of contact for all floating cover products.
- 25+ year product lifespan — all products manufactured from UV-stabilized, recyclable HDPE with no maintenance required.
Product Specifications at a Glance
Quick-reference specifications for all AWTT modular floating cover products, organized by geometry. Click any product name for full technical data.
Ball Covers
| Product | Coverage | Wind Rating | R-Value | Best For |
|---|---|---|---|---|
| Armor Ball® | 91% | 35 MPH | R-2 | Budget applications, sheltered ponds |
| Armor Ball® AQUA 275 | 91% | 75 MPH | R-2 | Wind-exposed sites, cost-effective |
Hexagonal Tile Covers
| Product | Coverage | Wind Rating | R-Value | Best For |
|---|---|---|---|---|
| Hexprotect® SLIM | 99% | 30 MPH | R-1 | Lightweight, sheltered high-coverage |
| Hexprotect® AQUA | 99% | 130+ MPH | R-2 | Best all-around, potable water safe |
| Hexprotect® MAX R | 99% | 40 MPH | R-17+ | Maximum insulation, digesters |
| Rhombo Hexoshield® | 98% | 130 MPH | R-4 | Max evaporation reduction + wind |
| Rhombo Hexoshield® 189 | 98% | 90+ MPH | R-8 | Highest insulation with wind resistance |
For detailed dimensions, weight specifications, material certifications, and CAD drawings, visit the Technical Data page or contact our engineering team for project-specific documentation.
Frequently Asked Questions
Can ball covers and hexagonal tile covers be used on the same pond?
Yes. Ball covers and hexagonal tile covers are independently buoyant and can be deployed in separate zones of the same water body. For example, you might use Hexprotect AQUA tiles in a wind-exposed section for maximum wind resistance and Armor Ball units in a sheltered cove where budget is the priority. The two geometries will not interlock with each other, but they will butt up against one another and still provide effective coverage across the full surface.
Which geometry is better for windy sites?
Water ballast, more than shape, is what wins in wind. The Hexprotect AQUA tile is rated to 130+ MPH through pre-loaded water ballast (100%–300% of basic tile weight), the Rhombo Hexoshield 66 achieves 130 MPH through water-ballasted hybrid geometry, and the Rhombo Hexoshield 189 handles 90+ MPH. On the ball side, the Armor Ball AQUA 275 is rated at 75 MPH and maintained coverage in testing up to 250 MPH — but the standard hollow Armor Ball is for sheltered sites only, and interlocking tiles keep a more cohesive mat with 97-99% coverage while resisting the same winds.
Are ball covers cheaper than hexagonal tile covers?
Not on the published AWTT price list: Armor Ball and Hexprotect AQUA sit in the same non-insulated tranche of $1.75-$2.50 per square foot, and in 2023 written quotes the hexagonal tile actually priced lower ($2.30 vs. $2.38 per sq ft). Because tiles also achieve 97-99% surface coverage versus 91% for close-packed spheres, the tile usually delivers more coverage per dollar. Pricing is per square foot, not per piece: 2.62 Hexprotect tiles or 10 balls make one square foot.
Do hexagonal covers require more maintenance than ball covers?
No. Both ball covers and hexagonal tile covers are manufactured from UV-stabilized HDPE with no moving parts, no fasteners, and no mechanical components. Neither geometry requires routine maintenance over its 25+ year expected lifespan. If a unit is damaged, it can be individually removed and replaced without draining the pond or disturbing surrounding units — regardless of whether the cover is ball-shaped or hexagonal.