Multi-plate 100+ Structures

Corrugated aluminium plate culverts have been used around the world for over 60 years and are a proven option for many civil infrastructure applications. Multi-plate 100+is a premium, enhanced durability range of aluminium culverts engineered to achieve a 100-year design life in New Zealand conditions. CSP also supplies culverts for less demanding applications - galvanised Steel Multi-plate for up to 50 years service life and standard Aluminium Multi-plate for 75 years service life.

For more information on the durability, performance and methods for predicting the service life of CSP's range of Multi-plate™ structures click here.

Multi-plate 100+ culverts span up to 8m (depending on the loading and backfill). For spans exceeding 8m refer to CSP's SuperCor™ information.

Application Versatility

The versatility of Multi-plate structures is limited only by engineering inventiveness. Traditional uses include culverts - small and large, bridges, storm drains, pedestrian and stock underpasses. However, other applications include mine and tunnel portal protection, conveyor housings, water tanks, caissons, underground storage facilities, and even wineries.


Cost Benefits

Multi-plate 100+installation can provide many advantages:

  • Premium durability culvert option offering service life of 100 years.
  • Culverts are designed by Project Engineers however CSP can review the structural design and issue Producer Statement PS2 (Design Review).
  • Aluminium oxidation products look similar to the metal itself so there is no ‘rusty’ appearance.
  • Fast economical job completion.
  • Simple assembly of the culvert - please note the project requires engineering supervision and the backfilling of the structure requires skill and experience.
  • Low equipment costs for assembly due to the very lightweight of the average plate, i.e. less than 75kg.
  • Pre-assembly reduces inconvenience and cost to maintain existing services.

Ease of Installation

Easy installation of Multi-plate 100+structures offer very real benefits to specifiers in both normal and difficult situations. The easily handled corrugated plate system can be erected on-site - an ideal solution for remote areas where access is difficult - or delivered to site fully assembled if access and transport regulations allow, where fast job completion is vital.

Multi-plate structures derive their strength through the interaction with the surrounding backfill. Design and supervision of this should be conducted by an experienced engineer. The site engineer is to ensure that assumptions made at the design stage are present on-site and that backfilling is in accordance with the specification.

Note: Multi-plate structures are not stocked items. A lead time for manufacture can be provided following the design and consultation process.


Design, manufacture and Installation requirements for Multi-plate 100+structures are specified in AS/NZS 2041: Buried Corrugated Metal structures. This is a joint Australian and New Zealand Standard with several parts. Those applicable to Multi-plate 100+structures are as follows:

  • AS/NZS 2041.1:2011 Buried Corrugated Metal Structures - Part 1 Design Methods
  • AS/NZS 2041.2:2011 Buried Corrugated Metal Structures - Part 2 Installation Methods
  • AS/NZS 2041.6:2011 Buried Corrugated Metal Structures - Part 6 Bolted Plate Structures