Most gym owners discover they ordered the wrong tatami after installation. The mats are either too soft for judo throws, too hard for gymnastics, or — worst case — not CE certified and unacceptable for insurance purposes. This guide exists to prevent that. We manufacture EVA tatami mats at our Istanbul facility and ship to dojos, distributors and gym equipment brands across Europe, the Middle East and beyond. What follows is exactly what our procurement team tells every new buyer before they place their first order.
Why Density Matters More Than Thickness
Thickness determines the height of the mat and contributes to shock absorption. Density (measured in kg/m³) determines hardness, durability, and structural performance under repeated impact. A 40mm mat at 80 kg/m³ feels and performs completely differently from a 40mm mat at 160 kg/m³.
Here is the practical consequence: a mat that is too low in density compresses permanently after a few months of use — the foam "bottoms out" and stops absorbing impact. A mat that is too high in density causes joint stress from hard landings. Matching density to discipline is not a preference; it is a safety specification.
Not sure which density is right for your facility? Our technical team will specify the correct grade for your discipline and usage frequency.
Request Free Technical Consultation →Thickness & Density by Discipline — Reference Table
This table reflects IJF (International Judo Federation), World Karate Federation and general sports facility standards, combined with our production experience across 200+ gym projects:
| Discipline | Recommended Thickness | Density (kg/m³) | Shore C | Notes |
|---|---|---|---|---|
| Judo | 40mm | 140–160 | 50–58 | IJF-aligned. High fall impact — density is critical. |
| MMA / BJJ | 30–40mm | 120–150 | 48–55 | Mixed use — balance between grip and cushion. |
| Karate / Taekwondo | 20–25mm | 80–100 | 38–48 | Lighter falls — medium density sufficient. |
| Aikido / Hapkido | 30–40mm | 100–130 | 44–52 | Rolling techniques — needs recovery performance. |
| Gymnastics | 25–30mm | 100–120 | 44–50 | Surface firmness for tumbling and floor work. |
| CrossFit / Functional Fitness | 20mm | 80–100 | 38–46 | Impact absorption for box jumps and deadlifts. |
| School / Multipurpose Hall | 20–25mm | 80–100 | 38–46 | General use. CE certification usually required by facility. |
| Elite Competition Floor | 40mm | 160 | 58–62 | Maximum density. Certification package mandatory. |
Surface Pattern — Functional Choice, Not Aesthetic
The surface pattern of a tatami mat affects grip, hygiene, maintenance and competitive eligibility. Choosing the wrong pattern creates operational problems that buyers only discover after installation.
Tatami Weave (Standard)
The traditional woven surface texture. Provides consistent grip for barefoot movement. Required for competition-grade judo and karate mats. Easy to clean with standard gym disinfectants. This is the correct default for any martial arts dojo.
Smooth
No texture — clean, flat surface. Easier to mop and sanitize. Preferred for multipurpose halls where shoes are also worn. Lower grip than tatami weave — not recommended for disciplines involving throws or groundwork.
Diamond (Baklava)
Anti-slip embossed texture. Strong directional grip. Popular for fitness centers and CrossFit boxes where lateral movement and jumping are common. Also used for interlocking puzzle-edge mats in modular installations.
Custom Emboss
Available for orders above 2,000 m² with a one-time tooling fee. Gym branding, logos and custom patterns are producible in-house.
CE Certification — What It Means for Your Facility
CE marking is not a marketing label. For EVA tatami mats used in sports facilities, it is a legal requirement in most EU member states and carries direct implications for your facility's insurance coverage and liability exposure.
If an athlete is injured on a non-CE-certified mat in your facility, your insurer may void the claim. If you operate a school gym or publicly funded sports facility, CE-uncertified flooring may constitute a regulatory violation. The cost of replacing non-compliant mats after installation is significantly higher than ordering correctly the first time.
What to demand from your supplier:
- CE Certificate of Conformity (COC) — specific to the product, not generic
- RoHS compliance declaration — no hazardous substances
- REACH SVHC-free statement — EU chemicals regulation compliance
- Density test report — batch-specific, not sample-based
- Flammability classification — required for public facilities in most EU countries
At Atami EVA, all five documents are included with every order at no additional cost. We issue batch-specific test reports — not generic product certificates.
Need a certification documentation sample before committing to an order? We'll send the full package within 24 hours.
Request Certification Package →How to Calculate Your Order Quantity
Accurate quantity calculation prevents both shortfall (delayed installation) and overstock (wasted budget). Use the following formula:
Order quantity (m²) = Floor area (m²) × 1.08
The 8% addition covers: cutting waste at room edges, replacement inventory for future damage, and doorway/column cutouts. For rooms with complex geometry or many columns, increase the factor to 1.12.
Interlocking (puzzle-edge) vs. roll format:
- Interlocking tiles (1m×1m or 1m×2m): No adhesive required. Modular — tiles can be replaced individually. Best for permanent installations and competition floors. Slight gap risk at edges under heavy use.
- Roll format: Seamless surface. Requires adhesive or frame perimeter. Better for rental/temporary setups. Lower per-m² cost. More complex to replace partially.
5 Questions to Ask Any Tatami Supplier Before You Pay
These questions will immediately differentiate a real manufacturer from a trading company reselling imported product with unknown specifications:
- "Can you provide a batch-specific density test report for this order?"
A real manufacturer issues a test certificate tied to your production batch. A trading company cannot. - "What is your monthly tatami production capacity?"
Capacity below 5,000 m²/month signals a small operation with limited QC infrastructure. Ask for the actual number. - "Is the surface pattern produced in-house or outsourced?"
In-house embossing means consistent pattern quality and no delivery risk from a third-party supplier. - "What incoterm do you offer, and who is your preferred freight partner for EU delivery?"
A manufacturer with real export experience will name specific freight partners and know typical transit times to your country. - "Can I receive a physical sample before placing the bulk order?"
Any legitimate supplier will dispatch samples. If the answer involves a high sample cost or long wait, proceed with caution.
The next article in this series covers exactly how to evaluate a tatami supplier — including a full 8-point procurement checklist and an RFQ template that gets responses.
Ready to specify your tatami order? Send us your floor dimensions, discipline and certification requirements — we'll respond with a full specification and price within 24 hours.
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