Trendstone Retaining Wall Systems - Technical Specifications

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Un-Reinfoced Gravity Walls (See Fig 1)

Heights listed below are for gravity walls with no reinforcement. Walls can be constructed up to several metres if fully engineered as a geo-grid reinforced wall, canterlievered wall incoporating steel reinforcing and concrete core infill or No Fines Concrete Wall. To comply with most council requirements, please seek specific engineering advice for walls over 1 metre high, terraced walls, fences above walls, walls carrying vehicle traffic and any other special application.

**Footing Type

The wall shall be built on a bearing pad, not less than 150mm thick, consisting of one of the following options:

Option A
Compacted crushed rock, well-graded and of low plasticity (without clay content), compacted by a plate vibrator; or cement-stabilized crushed rock, with an additional 5% by mass of GP Portland cement thoroughly mixed, moistened and compacted by a plate vibrator; or

Option B
Lean-mix concrete with a compressive strength of not less than 15 MPa.

Construction Note:

Designed in accordance with AS4678 Structure Classification A and CMAA Manual MA 53 Appendix E.
The heights for landscaping walls shall not exceed the values given in the table above. If higher walls are required, they shall be designed by a qualified and experienced engineer using either the software package or the detailed tables below.

No-Fines Concrete Backed Wall (See Fig 2)

Engineering - To comply with most council requirements, please seek specific engineering advise for walls over 1 metre high or for low walls carrying car traffic, etc.

Disclaimer: Apex Masonry formerly Wide Bay Blocks & Pavers takes no responsibility for any walls constructed outside the parameters of engineering specifications supplied. Walls exceeding maximum heights shown will need to be designed and certified by a qualified engineer. Wide Bay Blocks & Pavers have extensive information available for use by qualified engineers certifying walls over the maximum height shown on this website. The authors, publishers and distributors of these tables do not accept any responsibility for incorrect, inappropriate or incomplete use of this information; or for inadequate site investigation, design and specification.

Geo-Grid Reinforced Walls (See Fig 3)

Construction Notes (Applies to NFC Backed Walls & Geo-grid Reinforced Walls):

Designed in accordance with AS4678 Structure Classification A and B & CMAA Manual MA 52 and MA 53 as appropriate.
Retaining walls up to and including 1.5 meters high are designed for an imposed load (live load) of 2.5kPa.
Retaining walls over 1.5m high designed for and imposed load (live load) of 5.0kPa.
Footings should be 5% cement-stabilised crushed rock to dimensions shown.
Before the bottom course is positioned, the footing should be moistened to ensure bond between the block and footing.
For reinforced soil systems (incorporating polyester geo-grids), the minimum number of grids is three and the min. length or grids is 1m.
Geo-grid lengths from design tables above are measured from the back of the wall.
All geo-grids are Fortrac 35-20 or equivalent. The spacing of geo-grids is 400mm (every second block) except at the base of the wall, where it is 200mm (one course).
These tables are a guide, all retaining walls over one metre in height need to be designed and certified by a qualified engineer.