Gabion Basket v Concrete Blocks to Build Retaining Walls
We are frequently asked what is the cost difference and benefits between the construction of a retaining wall using gabion baskets or concrete blocks. In a nutshell the differences are:
Cost difference – Gabion baskets are more competitive to build
Life span – Concrete blocks have far greater life span
Speed of construction – Concrete blocks can be built 5 x faster on site
The unit rate for a m3 of gabion basket is built up as:
Stone delivered to site at 1.6 tonne m3 £36
Site plant and labour with an output of 20m3 per day £24
Contractor overhead and profit £15
Total = £98m3
The unit rate for m3 of concrete block is built up as:
Manufacture and delivery of block m3 £156
Site plant and labour with an output of 100m3 per day £6
Contractor overhead and profit £25
The above costs are approximate as material specifications and location will make a difference to the overall cost.
The life span of a C50 concrete block is between 125 to 150 year if not more. The blocks have no reinforcement so they will not crack and degrade from steel corrosion.
The like span of a gabion basket depends on the specification of the wire basket. The normal life span is between 40 and 60 years.
If the retaining wall design life span is more than 60 years it will be more cost effective to use concrete blocks.
Speed of Construction
The site output to build a gabion wall is 20m3 per gang day using a 360 machine and three men.
The site output to build a concrete block gravity retaining wall is 100m3 per day using a tele-handler and two men.
The difference in out put is 5 x faster to build a concrete block retaining wall than a gabion retaining wall. On some projects this can take weeks off a program. If speed is the driver concrete blocks is the answer.
Call today and tell us about your project. We can then design it and give you the quantities of blocks you require together with a quotation. We supply all the method and risk assessments and COSHH data sheets for installation. Opening hours from 9am to 5pm Monday to Friday (except bank holidays).
Blockwalls provide innovative and efficient building solutions for green infrastructure.
Our blocks are designed and assembled to build permanent or temporary structures instantaneously without the need of expensive joining techniques or intensive labour hours that presents a cost-effective alternative to comparable steel soil reinforcement or conventional reinforced concrete walls.
They can be used to create a multitude of fire grade structures of up to 8 metres in height use support rods that are installed at the base, which provide increased stability to protect both integrity and strength.
Block formulas are stress tested to meet with British Civil Engineering industry standards and to stand the test of time. There is also a range of environmental and finishing blocks that provide a high-aesthetic finish to any job reducing your projects carbon footprint.