The Decorwall Block® was designed exclusively by Decorton Retaining Systems Pty (Ltd) in response to the need for cost-effective **retaining blocks**. These blocks are unique in their design because of their side-wall shape that allows greater contact with the block below, and thus reduces the chance of the blocks cracking under high wall loads.

When choosing *retaining blocks* for any domestic or industrial project, choosing the most cost-effective and durable option are often two top priorities. With Decorwall Block®, only 10.5 blocks are required per square meter, whereas most opposition blocks require 12 blocks per square meter. This allows clients to save on product costs, transport and labour requirements.

Apart from being one of the most affordable options in the retaining blocks industry, the Decorwall Block® retaining systems are also known for:

- Enhancing plant growth: the unique hollow-core design of these blocks is perfect for planting plants and making it part of your wall. The design also allows water to drain back into the ground. Using low-water-use plants, one can create a landscape that is fully sustainable.
- Durability: these concrete blocks will not rot or diminish over time. It is also possible to replace individual blocks if damage occurs.
- Layout flexibility: the unique interlock design allows for convex and concave curves, while it is also suited for wall angles varying from near vertical to shallow slopes.
- Cost-effective and user-friendly: these retaining blocks are lightweight for easy handling, transport and installation.

For more information about this product, including the range of uses and applications, feel free to get in touch with us to speak to an expert on retaining blocks. We look forward to working with you!

Wall height graphs for different back slopes using Decorwall Blocks

No Surcharge - Top Soil Infill - Internal Friction Angle 30°

Graph 1a. Wall height for different back slopes

Graph 1b. Keyless height of wall for different back slopes

Wall height graphs for different back slopes using Decorwall Blocks

No Surcharge - Top Soil Infill - Internal Friction Angle 26°

Graph 2a. Wall height for different back slopes

Graph 2b. Keyless height of wall for different back slopes

How to use these graphs for conceptual design

Final designs to be refered to a Professional Competent Person

SCENARIO 1: (max wall height for different back slopes; either graph 1a or 2a)

PART A

- Determine the internal friction angle of the soil (Graph 1 = 30°; Graph 2 = 26°)
- Determine the back slope angle of the soil in degrees
- Determine the proposed wall inclination angle in degrees
- Choose the corresponding wall inclination angle on the horizontal axis of the graph and draw a vertical line until it intersects the back slope curve as determined above
- Now draw a horizontal line from the intersection point to the vertical axis to the left and read the allowable wall height for the wall

PART B

Choose the appropriate graph referring to Keyless Height (either graph 1B or 2B with other similar parameters as chosen above.)

- Choose the corresponding wall inclination angle on the horizontal axis of the graph and draw a vertical line until it intersects the back slope curve as determined above
- Now draw a horizontal line from the intersection point to the vertical axis to the left and read the allowable keyless wall height for the wall

# Determine the height to be supplied with keys from the bottom of the wall by calculating

the difference between Wall height and Keyless Height as determined above

_______________________

SCENARIO 2 alternatively: (max wall inclination angle for wall; either graph 1a or 2a)

PART A

- Determine the internal friction angle of the soil (Graph 1 = 30°; Graph 2 = 26°)
- Determine the back slope angle of the soil in degrees
- Determine the proposed wall height in meters
- Choose the corresponding wall height on the vertical axis of the graph and draw a horizontal line until it intersects the back slope curve as determined above
- Now draw a vertical line from the intersection point to the horizontal axis to the bottom and read the allowable wall inclination angle for the wall

PART B

Choose the appropriate graph referring to Keyless Height (either graph 1B or 2B with other similar parameters as chosen above.)

- Choose the corresponding wall inclination angle on the horizontal axis of the graph and draw a vertical line until it intersects the back slope curve as determined above
- Now draw a horizontal line from the intersection point to the vertical axis to the left and read the allowable keyless wall height for the wall

# Determine the height to be supplied with keys from the bottom of the wall by calculating

the difference between Wall height and Keyless Height as determined above

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CONTACT INFORMATION

Head Office:

Tel: +27 (0)21 875 5155

Fax: +27 (0)21 8755170

Email: walls@decorton.co.za

Address: Main Road, Klapmuts, Paarl, Western Cape

P.O. Box 36, Klapmuts 7625, South Africa

Northern Suburbs:

SP van Blerk: 083 229 9842

Southern Suburbs:

Jeremy Leighton: 083 226 4355

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