INSTALLATION GUIDELINE – GreenLock R12 and S12 Retaining Wall Blocks

Planning

Measure the length and height of the proposed wall and multiply these two numbers to calculate the square meter surface area. Multiply the number of square meter by 12 to obtain the number of blocks required for the S12, R12 and V12 GreenLock retainer blocks(excluding cutting and wastage).

A rule of thumb is, where the wall is less than 1,2m built to a batter of 70° (from horizontal) and where soil and drainage conditions are good and well compacted, there should be no need for an engineer. Where however, the height of the wall exceeds 1,2m, or if problem soils (clay) or a high water table exists, or where a structure is to be erected on top of the retained fill close to the wall, or even load bearing walls, then the
services of an engineer or competent person are required. In such cases, the local authorities should insist on a design and stability certificate from the engineer

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 on the foundation ensuring that the concave and convex interlocking ends of the blocks mesh as closely as possible. The blocks must be placed level in all direction on the foundation. If need be and to level the first block row perfectly, one can embed the first block row in a mortar bed.
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. Please note that for proper drainage the drainage pipe assembly must be placed slightly higher than the ground surface area of the front of the retaining wall. Drainage outlet pipes, connected to the main drainage pipe, should be installed intermittent and in accordance to the length of the wall, allowing any accumulating seepage water behind the wall to escape freely.

What is the “OFF SET”
One measures the OFF SET at the beginning of each block row. It is the dimension measured from the edge of the first block of the first row to the edge of first block of the second block row laid and so on.
For the visual effect of a retaining wall it is important to note that the distance / dimension of the OFF SET at the beginning of each block row should always be the same. Even if curves, circles or soft angles are integrated into a wall, this rule applies. For instance if one chooses to lay the first block of the second row of blocks exactly halfway over the joint of the first block row, then each subsequent row should be laid the same way. The GreenLock 12 series is 380mm long the OFF SET dimension would then be 180mm.
It is not important what the OFF SET dimension is, as long as it always the same dimension with each row laid. If one follows this advise the finished wall will look stunning, aesthetically pleasing and important for the eye, with evenly fluted joints. If one does not follow this rule, the wall will not be weaker but it will visually look untidy and create a “dizzy” look.

Important Note:
If a sharp corner, like 45 or 90 degrees corner is integrated into the wall this rule does not apply. For sharp corners and after the first block row has been placed and laid including the corner, the second row of blocks should start with the corner block placed exactly over the bottom corner block using the chosen Set Back dimension. The next blocks are then laid in both directions away from the corner block. The joints between the blocks of each block row will automatically form an evenly distributed fluted pattern over the whole length and height of the finished wall.

To achieve the desired wall angle, refer to the Setback Table to select correct setback distance.
Remember to fill all consecutive blocks and before the next block row is placed, 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 against the 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.

INSTALLATION GUIDELINE – GREENLOCK L7 AND L9 RETAINING WALL BLOCKS

Planning

Measure the length and height of the proposed wall and multiply these two numbers to calculate the square meter surface area. Multiply the number of square meter by 7 for the L7 or 9 for the L9, alternatively 12 for the L7 or 15 for the  L9, depending which lay-out or which block is used, to obtain the number of  blocks required for the L7 or L9 GreenLock retainer blocks (excluding possible cutting and/or wastage).

A rule of thumb is, where the wall is less than 1,2m built to a batter of 75° (from horizontal) and where soil and drainage conditions are good and well compacted, there should be no need for an engineer. Where however, the height of the wall exceeds 1,2m, or if problem soils (clay) or a high water table exists, or where a structure is to be erected on top of the retained fill close to the wall, or even load bearing walls, then the services of an engineer or competent person are required. In such cases, the local authorities should insist on a design and stability certificate from the engineer

Typical Installation

Measure the wall layout & mark the course using string and stakes. In the closed layout the L7 and the L9 block is self aligning.
Dig a trench 400mm deep, 700mm wide for single skin walls and create either a compacted gravel or a concrete base 300mm 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. For additional wall strength the foundation top surface may have a max. of 5 degree angle slanting towards the embankment.
Place first row of blocks onto the foundation, whichever layout is chosen, ensuring that the blocks are spaced with the correct spacing for the open layout and without slider and that for the closed layout the interlocking ends of the blocks mesh as closely as possible. The blocks must be placed level in all direction on the foundation. If the foundation surface is angled then the blocks should follow that angle. For additional wall strength the first block row should be imbedded in a mortar bed and the blocks and cavities filled with a weak concrete mix.

Place a flexible perforated drainage pipe, 75 – 110mm in diameter, behind the first layer of blocks, (above ground level) and 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. Please note that for proper drainage the drainage pipe assembly must be placed slightly higher than the ground surface area of the front of the retaining wall. Drainage outlet pipes, connected to the main drainage pipe, should be installed intermittent and in accordance to the length of the wall, allowing any accumulating seepage water behind the wall to escape freely.

What is the “OFF SET”
One measures the OFF SET at the beginning of each block row. It is the dimension measured from the edge of the first block of the first row to the edge of first block of the second block row laid and so on. The L7 and the L9 are automatically spaced correctly if the slider is used and/or the vertically placed front face groves if the open face layout is used. For more information please read the detailed information under the PRODUCTS heading.
For the visual effect of a retaining wall it is important to note that the distance / dimension of the OFF SET at the beginning of each block row should always be the same. Even if curves, circles or soft angles are integrated into a wall, this rule applies. For instance if one chooses to lay the first block of the second row of blocks exactly halfway over the joint of the first block row, then each subsequent row should be laid the same way.
For the L7 and the L9 retainer block it is important that the OFF SET dimension is always in accordance with the chosen  layout used and that with each block row laid that the same dimension is maintained. If one follows this advise the finished wall will look stunning, aesthetically pleasing and important for the eye, with evenly fluted joints. If one does not follow this rule, the wall will not be weaker but it will visually look untidy and create a “dizzy” look.

Important Note:
For sharp curves or corners, like 45 or 90 degree corners in the wall this rule of the OFF SET does not apply. For sharp curves or corners and after the first block row has been placed and laid including the curve/corner, the second row of blocks should start in the center of the curve/corner block placed exactly over the first row corner block. The next blocks are then laid in both directions away from the corner block. The joints between the blocks, whether laid with or without a gap or with or without a slider each block row will automatically form an evenly distributed fluted pattern over the whole length and height of the finished wall.

To achieve the desired wall angle, refer to the Setback Table to select correct setback distance. The L7 and the L9 have   a predetermend wall angle because of the front lip. That wall angle can only be changed by a slanted foundation or with the use of the slider. Please read the information provided under the PRODUCTS column for the L7 and the L9 retainer blocks.
Remember to fill all blocks and cavities with top soil before the next block row is placed if these are to be planted, and to compact the backfill as much as possible and the fill in the blocks slightly. 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 the blocks. The L7 and the L9 has unique additional wall anchor possibilities by using horizontally placed reinforcing Y-bars. For additional information please read the information under PRODUCTS information for the L7 and the L9 retainer blocks

INSTALLATION GUIDELINE – GreenLock V12 Block

Planning

  • Measure the length and height of the proposed wall and multiply these two numbers to calculate the square meter surface area. Multiply the number of square meter by 12 to obtain the number of blocks required for the S12, R12 and V12 GreenLock retainer blocks(excluding cutting and wastage).
  • Retaining walls must comply with local building regulations.
  • A rule of thumb is, where the wall is less than 1,2m built to a batter of 70° (from horizontal) and where soil and drainage conditions are good and well compacted, there should be no need for an engineer. Where however, the height of the wall exceeds 1,2m, or if problem soils (clay) or a high water table exists, or where a structure is to be erected on top of the retained fill close to the wall, or even load bearing walls, then the
    services of an engineer or competent person are required. In such cases, the local authorities should insist on a design and stability certificate from the engineer

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 on the foundation ensuring that the concave and convex interlocking ends of the blocks mesh as closely as possible. The blocks must be placed level in all direction on the foundation. If need be and to level the first block row perfectly, one can embed the first block row in a mortar bed.
  • 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. Please note that for proper drainage the drainage pipe assembly must be placed slightly higher than the ground surface area of the front of the retaining wall. Drainage outlet pipes, connected to the main drainage pipe, should be installed intermittent and in accordance to the length of the wall, allowing any accumulating seepage water behind the wall to escape freely.
  • Each marker (inset dimple) on the block represents a 10º (ten degree) change in angle. For a twenty degree curve, line up the second marker with the main marker. A maximum turn of 105º can be achieved. The seven markers on the large circumference of the block represent an angle of 45 ° between each marker.

What is the “OFF SET”

One measures the OFF SET at the beginning of each block row. It is the dimension measured from the edge of the first block of the first row to the edge of first block of the second block row laid and so on.
For the visual effect of a retaining wall it is important to note that the distance / dimension of the OFF SET at the beginning of each block row should always be the same. Even if curves, circles or soft angles are integrated into a wall, this rule applies. For instance if one chooses to lay the first block of the second row of blocks exactly halfway over the joint of the first block row, then each subsequent row should be laid the same way. The GreenLock 12 series is 380mm long the OFF SET dimension would then be 180mm.
It is not important what the OFF SET dimension is, as long as it always the same dimension with each row laid. If one follows this advise the finished wall will look stunning, aesthetically pleasing and important for the eye, with evenly fluted joints. If one does not follow this rule, the wall will not be weaker but it will visually look untidy and create a “dizzy” look.

Important Note:
If a sharp corner, like 45 or 90 degrees corner is integrated into the wall this rule does not apply. For sharp corners and after the first block row has been placed and laid including the corner, the second row of blocks should start with the corner block placed exactly over the bottom corner block using the chosen Set Back dimension. The next blocks are then laid in both directions away from the corner block. The joints between the blocks of each block row will automatically form an evenly distributed fluted pattern over the whole length and height of the finished wall.

The 45° marker on the back block lines up with the centre marker on the front block, means that there is a 45 ° angle between the blocks.

The 45° marker on the back block lines up with the 10° marker on the front block giving an angle of 35° between the blocks.

The 45° marker on the back block lines up with the 10° marker on the front block giving an angle of 35° between the blocks.

The 90° marker on the back block is lined up with the middle marker on the front block giving a right angle turn to the wall.

  • For steep and/or 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 row 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. Please note that for proper drainage the drainage pipe assembly must be placed slightly higher than the ground surface area of the front of the retaining wall. Drainage outlet pipes, connected to the main drainage pipe, should be installed intermittent and in accordance to the length of the wall, allowing any accumulating seepage water behind the wall to escape freely.
  • To achieve the desired angle and setback of the wall, refer to the supplied setback table. (The setback distance is measured from the outermost part of the block. A setback of less than 21mm will allow soil to fall through the block and a setback of 63mm will align the concave and convex sections of alternative layers.)
  • Remember to fill consecutive blocks with topsoil if these are to be planted up and remember 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.
  • Your wall is now ready to be planted up or left as is.