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Considerations when retaining with boulders

Ten things you need to know when building retaining walls in areas like Brisbane and the Gold Coast

1. Once you have decided you want a boulder retaining wall, the first question you will be asked is which type of rock you prefer.

2. The types of product are Sandstone random, Sandstone Hybrid, Sandstone dimensional blocks A Grade, or B Grade, Granite, Bushrock, Volcanic red rock, or Blue metal rock.

3. The access required for machinery is a minimum of 2m in width and 4m in height. Due to the weight of the machinery we cannot access from on top of an existing retaining wall.

4. The site would need a dumping area large enough to put rocks, gravel, fill etc. to be used on the job.

5. It is preferable to have products close to where the walls are to be built, otherwise extra costs can be incurred to cart the products in.

6. Retaining walls over one metre in height will need an engineers design and certification to Government Form 15 (We can engage our engineers for this service)

7. A soil test would be required for this. You can either provide one of your own if you have one or we can engage our soil tester for this service.

8. Boulder wall costs can blow out when access becomes difficult. It is always better and more cost effective to have the retaining walls built when the block is vacant and has not had the slab poured.

9. Boulder walls have options of access to elevated areas such as sandstone steps or steppers, pathways etc. We can also provide Garden rock edges, sandstone seats, letterboxes, water features etc.

10. Always consider your driveway when building boulder retaining walls. It is best not to drive over the driveway with heavy machinery as there is a strong likelihood that the surface will crack. There is an option to have it protected however it is quite costly. If possible the walls should be built before the driveway is constructed.

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