INSTALLATION GUIDELINE - GreenLock S12 Block

Planning

Measure the length and height of the proposed wall and multiply these two numbers to calculate the surface area. Multiply this number by 12 to obtain the number of blocks required (excluding cutting and wastage).
Retaining walls must comply with local building regulations.
A rule of thumb is, where the wall is less than 1.2 meters high and where soil and drainage conditions are good, there should be no need for an engineer. In all other instances the services of an engineer are required.

Typical Installation

Measure the wall layout & mark the course using string and stakes.
Dig a trench 400mm deep, 600mm wide and create either a compacted gravel or a concrete base 200mm deep. (Gravel foundations are usually sufficient for walls under one (1) meter in height) It is imperative that the foundation is level in all directions.
Place first row of blocks upside down (smoothest edge down) on the foundation, ensuring blocks are level in all directions.
For steep and high walls the first layers can be filled with concrete and/or steel bars for extra stability.
Place a flexible perforated drainage pipe, 75 – 110mm in diameter, behind the first layer of blocks, wrap this in filter fabric. Ensure that 19mm gravel is wrapped in filter fabric around the drainage pipe. The gravel layer should be at least 400mm wide and 220mm deep.
To achieve desired angle of wall, refer to setback table to select correct setback distance.
Remember to fill all consecutive blocks with topsoil if these are to be planted up, and to compact blocks and backfill. Behind all layers there should be a layer of minimum 300mm wide of compacted drainage material, such as free draining sand.
When specified, install geofabric on compacted backfill and wedge between blocks. Shear keys are to be installed where specified by engineer.
Your wall is now ready either to be planted up or to be left as is.

All information given is based on an “average” installation and is not intended to replace the services of a qualified installer. No liability will be accepted for any claims resulting from the use of these guidelines. All information is given in good faith without warranty and no liability is accepted. Sole responsibility rests with the user who must ensure that a professional engineer is engaged to design and supervise the installation and that the wall is up to local government specifications. Why use an engineer?

For additional information contact us for a free CMA Retaining Wall Block Brochure.

E. & O.E.