— ENGINEERING —

16.7"
(424mm)
30.9"
(784mm)
43.0"
(1092mm)
1X 2X 3X
The Silva Cell is a rigorously engineered product that has undergone extensive FEA, lab, and field testing. With more than 1,000 installations in ten different countries, we've seen every construction scenario out there.

MATERIAL SPECIFICATIONS & TESTING

Deck: fiberglass reinforced, chemically-coupled, impact modified polypropylene.

Post and base: homopolymer polypropylene.

Proof-load tested and FEA analysis completed at an independent facility. Download the detailed engineering report (USA, Canada, United Kingdom).

The Silva Cell is a product, but it is also a system. Each installation site has its own unique attributes – soil, tree species, hydrology, climate, and more – that influence how it is incorporated and how it will perform. From early on in the design phases, every component of the site should be considered thoughtfully within the context of this system.

For engineers who want to begin using this system, visit our Getting Started section. Our team of technical experts is available to provide assistance throughout this process.

Information on the following is available by request. Please contact us for details.

  • Curb setbacks
  • Lateral loading
  • Dynamic loading
  • Geogrids & geotextiles
  • Drainage & water issues
  • Repairs & maintenance
  • Utilities

LOADING & ENGINEERING

Independent lab testing and engineering analysis shows that Silva Cell 2, when installed per manufacturer's specifications, meets or exceeds most loading requirements and safety factor, including AASHTO H/HS-20 (US), BS EN 1991-1-1:2002 (UK) and standards for tire contact surface area equal to 250 mm x 600 mm (Canada).
AASHTO H-20
- 32,000 lbs maximum per axle
- 16,000 lbs maximum per wheel
- Tire contact area is 14.25" radius
AASHTO HS-20
- 32,000 lbs maximum per axle
- 16,000 lbs maximum per wheel
- Tire contact area is 10"x 20" rectangle
ULIMATE WHEEL LOAD BY STANDARD PAVEMENT TYPE
The table below provides the maximum load that can be on any single wheel (tire), or per axle, for a given pavement section, assuming tires have a contact area equal to either the AASHTO H-20 standard of a 14.25" radius or the AASHTO HS-20 standard of a 10"x 20" rectangle. For more details, please refer to the Silva Cell 2 Engineering Report and Testing Conclusions.
Silva Cell System Type Traffic
Loading
Standard
Pavers
3.15" pavers
1" sand base
12" of aggregate
Wheel Axle
1X H-20 30,200 lbs 60,400 lbs
HS-20 31,800 lbs 63,600 lbs
2X H-20 33,200 lbs 66,400 lbs
HS-20 34,900 lbs 69,800 lbs
3X H-20 28,200 lbs 56,400 lbs
HS-20 29,700 lbs 59,400 lbs
Silva Cell System Type Traffic
Loading
Standard
Asphalt
4" of asphalt
12" of aggregate

Wheel Axle
1X H-20 40,600 lbs 93,200 lbs
HS-20 48,700 lbs 97,400 lbs
2X H-20 51,200 lbs 102,400 lbs
HS-20 53,500 lbs 107,000 lbs
3X H-20 43,500 lbs 87,000 lbs
HS-20 45,500 lbs 91,000 lbs
Silva Cell System Type Traffic
Loading
Standard
Concrete
4" of asphalt
4" of aggregate

Wheel Axle
1X H-20 34,900 lbs 69,800 lbs
HS-20 35,900 lbs 71,800 lbs
2X H-20 38,300 lbs 76,600 lbs
HS-20 39,500 lbs 79,000 lbs
3X H-20 32,600 lbs 65,200 lbs
HS-20 33,600 lbs 67,200 lbs
Silva Cell System Type Traffic
Loading
Standard
Pavers with Concrete
2.36" pavers
5" concrete

Wheel Axle
1X H-20 38,600 lbs 77,200 lbs
HS-20 41,100 lbs 82,200 lbs
2X H-20 42,200 lbs 84,800 lbs
HS-20 45,200 lbs 90,400 lbs
3X H-20 36,000 lbs 72,000 lbs
HS-20 38,400 lbs 76,800 lbs

Loading capacity can be adjusted based on section profile changes; the typical applications shown in the table above are the most commonly used. For more details, including information about lateral loading, please refer to the Silva Cell 2 Engineering Report and Testing Conclusions. For custom details and a review of your site-specific loading requirements, please This email address is being protected from spambots. You need JavaScript enabled to view it..

BS EN 1991-1-1:2002
- 11,500 kg maximum per axle
- 5,750 kg maximum per wheel
- Tyre contact surface area is 200 x 200 mm
ULIMATE WHEEL LOAD BY STANDARD PAVEMENT TYPE
The table below provides the maximum load that can be on any single wheel (tyre), or per axle, for a given pavement section, assuming tyres have a contact area equal to 200 mm x 200 mm as prescribed in the BS EN 1991-1-1:2002 including the UK annex, category G (<160 kN gross vehicle weight, on 2 axles). For more details, including information about lateral loading, please refer to the Silva Cell 2 Engineering Report and Testing Conclusions.
Silva Cell System Type Pavers
8 cm pavers
2.5 cm sand base
30 cm of aggregate
Wheel Axle
1X 121 kN 242 kN
12,338 kg 24,676 kg
2X 133 kN 266 kN
13,562 kg 27,124 kg
3X 113 kN 226 kN
11,523 kg 23,046 kg
Silva Cell System Type Asphalt
10 cm of asphalt
30 cm of aggregate

Wheel Axle
1X 198 kN 396 kN
20,190 kg 40,380 kg
2X 218 kN 436 kN
22,229 kg 44,458 kg
3X 185 kN 370 kN
18,864 kg 37,728 kg
Silva Cell System Type Concrete
10 cm of asphalt
10 cm of aggregate

Wheel Axle
1X 132 kN 264 kN
13,460 kg 26,920 kg
2X 145 kN 290 kN
14,786 kg 29,572 kg
3X 123 kN 246 kN
12,542 kg 25,084 kg
Silva Cell System Type Pavers with Concrete
6 cm pavers
12.7 cm concrete

Wheel Axle
1X 150 kN 300 kN
15,296 kg 10,592 kg
2X 165 kN 330 kN
16,825 kg 33,650 kg
3X 140 kN 280 kN
14,276 kg 28,552 kg

Loading capacity can be adjusted based on section profile changes; the typical applications shown in the table above are the most commonly used. For more details, including information about lateral loading, please refer to the Silva Cell 2 Engineering Report and Testing Conclusions. For custom details and a review of your site-specific loading requirements, please This email address is being protected from spambots. You need JavaScript enabled to view it..

- 175 kN maximum per axle
- 87.5 kN maximum per wheel
- Tire contact surface area is 250 x 600 mm
ULIMATE WHEEL LOAD BY STANDARD PAVEMENT TYPE
The table below provides the maximum load that can be on any single wheel (tire), or per axle, for a given pavement section, assuming tires have a contact area equal to 250 mm x 600 mm. For more details, including information about lateral loading, please refer to the Silva Cell 2 Engineering Report and Testing Conclusions.
Silva Cell System Type Pavers
8 cm pavers
2.5 cm sand base
30 cm of aggregate
Wheel Axle
1X 147 kN 294 kN
33,100 lbs 66,200 lbs
2X 162 kN 324 kN
36,400 lbs 72,800 lbs
3X 137 kN 274 kN
30,900 lbs 61,800 lbs
Silva Cell System Type Asphalt
10 cm of asphalt
30 cm of aggregate

Wheel Axle
1X 225 kN 450 kN
50,500 lbs 101,000 lbs
2X 247 kN 494 kN
55,500 lbs 111,000 lbs
3X 210 kN 420 kN
47,200 lbs 94,400 lbs
Silva Cell System Type Concrete
10 cm of asphalt
10 cm of aggregate

Wheel Axle
1X 165 kN 330 kN
37,000 lbs 74,000 lbs
2X 181 kN 362 kN
40,700 lbs 81,400 lbs
3X 154 kN 308 kN
34,600 lbs 69,200 lbs
Silva Cell System Type Pavers with Concrete
6 cm pavers
12.7 cm concrete

Wheel Axle
1X 184 kN 368 kN
41,400 lbs 82,800 lbs
2X 202 kN 404 kN
45,500 lbs 91,000 lbs
3X 172 kN 344 kN
38,700 lbs 77,400 lbs

Loading capacity can be adjusted based on section profile changes; the typical applications shown in the table above are the most commonly used. For more details, including information about lateral loading, please refer to the Silva Cell 2 Engineering Report and Testing Conclusions. For custom details and a review of your site-specific loading requirements, please This email address is being protected from spambots. You need JavaScript enabled to view it..

— Where to Buy —

CALL 415-781-9700
Calling internationally? Click here.
For general pricing, please visit our Price page