Step 1: Dig a shallow trench, level and place 100mm of crushed rock in the bottom. Level and compact. Allow for 75mm embedment of the bottom course and 300mm behind the wall for drainage.
Step 2: Spread and level approximately 25mm of course sand as a bedding layer then place the base row of Wallstone. Use a string line for creating a straight line and level from side to side and front to back. Install a 90mm AG pipe at the rear of the wall for drainage.
Step 3: Fill behind each course with granular rock for drainage and carefully compact. Check each course for level before proceeding and stack each additional row offsetting from the block below.
Step 4: On the last course of stacking units, place a line of adhesive front and back and place the capping unit. Apply pressure to secure and use a stringline and level for the best result.
Step 5: Slope the soil above and below the wall to ensure that water will flow away from and not accumulate near the wall.
• It is advisable to place a dob of adhesive between corner units.
• If a vertical wall is required then follow the same instructions but remove the narrow section at the top of each unit using a hammer and bolster.
TYPICAL CROSS SECTION
| Maximum Heights (before capping) |
| |
Vertical Wall |
Setback Wall |
Wallstone Solid |
750mm |
900mm |
Wallstone Hollow |
600mm |
750mm |
These heights apply where ideal site conditions exist, ie: no surcharge loading and site soils consisting of rock, gravel or sandy gravel (not sandy or silty clays).
Typical surcharge loadings are
• Wall supporting a driveway or any other load
• Greater than 3:1 slope above the wall
• Another retaining wall above the wall which is less in distance
behind the wall than double the height of the lower wall.
If a wall exceeds the maximum recommended heights or a surcharge loading applies please ask C&M for help or consult an engineer for design.
Note: All coloured product should be ordered at the one time to reduce the risk of batch variation. No claims will be accepted once product has been installed.
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