Culvert bags
High-Strength, Cost-Effective Concrete Solution for Erosion and Structural Control
Mastermix Culvert Bags are a high-strength, cost-effective solution designed for fast initial set and full cure within 28 days. Each 25kg bag is easy to handle and delivers efficient coverage of approximately 17–19 bags per m². Our bags are trusted and regularly used by industry leaders such as Fulton Hogan, Higgins, Fletcher Construction, Forest Management NZ Ltd., Forest Owner Marketing Services, Downer NZ Ltd, and numerous local authorities.
Applications
• Retaining walls & erosion control
• Riverbanks, dams, sea walls (with waterproof mix)
• Gabion basket fill
• Cattle underpass walls
• Flumes, chutes, steep slopes
• Bridge abutments
• Base stabilisation in soft gravel roads
• Earth dam erosion repair
Placement Guidelines
• Stack bags like bricks with a 10mm backward batter
• Stake every second bag from 3rd layer up (use warratahs or rods)
• Lay flat at pipe inlets/outlets to prevent scouring
• Bags can be watered during placement or left to set naturally
Specifications
| Special concrete mix in 25kg polypropylene bags |
| Size: L400mm × W300mm × H100mm |
| Coverage: Approximately 17–19 bags per m² 40 bags per pallet |
| Low UV resistance (designed for fast breakdown) |
| Tested Strength: 20MPa (7 days), 30MPa (28 days) |
| Independent test results available on request |
| Also available in eco-friendly hessian bags |
RELATED PRODUCTS
PAST PROJECT UTILISING CULBERT BAGS
