11 Tips to Building Retaining Walls.
11 Tips on excavation and types of retaining walls, If the slope of your land is steep.
Looks like a rock wall will be the only way to go. But before you dive in?
What sort of rock do I use?
How much is the costs going to be? Do I need a builder ? Sure, get a bobcat or excavator, create the two levels required by local council, buy some landscaping rock!
How hard can it be?
Like any building project, preparation is king and retaining walls are no different. In fact retaining wall construction is full of costly mistakes for the DIY and inexperienced. If you don’t get council approval make sure your heigh doesn’t go over the height specified.It could cost thousands if you don’t get the wall engineered and built correctly.
Some of the things you need to consider where retaining walls can be built:
. Walls exceeding a certain height can fail if not built correctly the height of the wall depends on lots of different factors.
. Load and weight are big problems with really wet and soft areas .
• What type of material will your retaining wall project be? Sandstone, timber, natural stone , retaining wall blocks , bush rock, basalt rock, pine sleepers, concrete sleepers, boulder wall and so on.
• What is the soil like? Is it clay, soil, rock?
• Are there any pipes, drainage or building regulations to consider before building retaining walls?
Below are 11 things to consider how to build a retaining wall.
#1. Depending on the lay of the land, do you need a high retaining wall or can you get away with building a terrace of say three lower walls? There are council requirements to consider over a certain height!
#2. What is the retaining wall for ? Having your retaining wall holding back steep banks of clay look amazing when built properly. Structural or just for looks Garden bed or driveway cut out? Many different options with very different building techniques and strength will play a part here.
#3. If your wall is for a garden bed and less than a metre in height and you are fit and able, you can build out of timber sleepers or concrete block systems, then yes you could maybe build your retaining wall yourself
#4. Do you need a Gravity Wall or a Reinforced Wall? What’s the difference? Gravity walls rely on their own weight and setback to hold up the soil behind them. Reinforced walls use layers of geogrid to combine the soil and block together to form a reinforced soil mass.
#5. Are you aware of the conditions above and below a retaining wall? The back of a retaining wall will have water in the lowest point ,100mm agg.pipes are the best option .You must use aggregate in the back of your wall.
#6. Will there be a slope above your retaining wall? If so you will likely need reinforcing, a slope puts a lot of extra pressure on any wall.
#8. Once you have decided to build your wall, what material are you going to use? Do you want it to look attractive and add value to your home?
This can come down to budget. Blocks, bush rocks, sandstone or sleepers .
#9. Do you have easy access to the site? There is a lot of heavy lifting, digging and filling to be done. Can a Excavator or bobcat get in there? Will you need to replace the soil behind the wall and if so can you spread it on your property or need dumping at an appropriate waste site?
#10. Is the area prone to heavy rain? Where and how do you disperse the water? You may also need to allow drainage within your retaining wall depending on which application you are using.
Type of materials for the construction of the wall, solid blocks versus rocks will have different drainage requirements as well.
#11. A retaining wall is like any building project. Spend time on preparation including testing the soil. Price your blocks or rocks and any other necessary materials.
Allow for obstacles like a big rock under the surface where you are going to dig. Is there any power, gas, telephone or water mains nearby?
As they say in the building game cut once measure twice.
Building a retaining wall for a garden bed or a driveway, both require a level of skill. After all, you do not want it to come crashing down and hurting someone, yourself or waste your money.
If you’d like a point in the right direction or other tips about building a retaining wall using a bobcat or excavator give us a call at AB Earthworks on 0405 538 678 before you start or email me here.
0405 538 678