Whether you're creating a raised garden bed, defining landscape edges, or retaining a section of soil, the Hardaz® Retaining Wall System offers a fast, durable, and cost-effective solution. Designed for simple installation with minimal excavation, Hardaz® helps you achieve a professional-looking result without the need for specialised tools or complicated construction methods.
With significant labour savings, no fasteners required, and a smart flush finish, Hardaz® is an ideal choice for DIY landscapers and homeowners looking to transform their outdoor spaces.
Why Choose the Hardaz® Retaining Wall System?
The Hardaz® Retaining Wall System has been designed to simplify retaining wall construction while delivering a clean, professional finish.
Key benefits include:
- Minimal excavation required
- No fasteners needed during installation
- Significant labour savings
- Flush wall finish for a neat, non-obtrusive appearance
- Easy garden maintenance
- Durable galvanised steel construction
- Adjustable post design to accommodate timber movement and shrinkage
- Quick and straightforward installation
Unlike conventional timber retaining walls, Hardaz® retaining walls are only one-third the thickness, helping maximise usable garden space while maintaining strength and durability.
The system is suitable for:
- Retaining walls up to 600mm high using standard posts
- Retaining walls up to 1 metre high using heavy-duty beams
- Garden edging
- Raised garden beds
- Sleeper retaining applications
Not sure if Hardaz® is the right solution for your project? Contact Stratco on 1300 165 165 or visit your nearest store for expert advice and product recommendations.
Tools and Materials You'll Need
Before you begin, gather the following tools and materials.
Tools
- Circular saw
- Spade
- String line
- Wheelbarrow
- Spirit level
Materials
- Hardaz® retaining posts or beams
- 150mm x 50mm or 200mm x 50mm timber rails
- Pre-mixed concrete
- Hardaz® joiner posts
- Hardaz® corner posts
- Hardaz® end caps (optional)
- Wall capping (optional)
Step 1: Plan and Measure Your Wall
Start by determining the desired length and height of your retaining wall.
For the most economical use of timber, Hardaz® posts should be spaced at 1200mm centres. Mark out the wall location using a string line to ensure a straight and accurate installation.
Careful planning at this stage will help minimise material waste and ensure a smoother installation process.
Step 2: Mark and Dig Post Holes
Using your measurements as a guide, mark the position of each post along the string line.
Dig post holes at 1200mm intervals. The depth of each hole will depend on the height of your retaining wall and local site conditions.
Ensure the holes are evenly spaced and aligned before proceeding.
Step 3: Install and Concrete the Posts
Position the Hardaz® retaining posts into the prepared holes.
Use a spirit level to ensure each post is perfectly vertical, then concrete them into place. Align the tops of the posts with your string line to maintain a consistent wall height.
Allow the concrete to fully set before continuing with the installation.
Choosing the Right Post
Different Hardaz® posts are designed for different applications:
- Joiner Posts - Used for straight wall runs.
- Corner Posts - Designed for 90-degree corners.
- End Caps - Provide a neat, professional finish at the end of the wall.
Step 4: Cut the Timber Rails to Length
Measure the distance between posts and cut your timber rails to suit using a circular saw.
Hardaz® is compatible with:
- 150mm x 50mm rails
- 200mm x 50mm rails
Take care to ensure all cuts are accurate for a clean and professional result.
Step 5: Insert the Rails
Once cut, simply slide the timber rails into the Hardaz® retaining posts.
One of the standout features of the Hardaz® system is the recessed post design, which allows for minor adjustments during installation. This helps achieve a precise fit while also accommodating future timber movement and shrinkage.
Because the system doesn't require fasteners, installation is quick and straightforward, helping you save both time and money.
Step 6: Add a Capping (Optional)
For an enhanced finish, consider installing a capping along the top of the wall.
A capping not only improves the appearance of the retaining wall but can also provide a more comfortable edge around garden beds and landscaping features.
Once installed, your Hardaz® retaining wall is complete and ready to enjoy.
If you need assistance selecting the right wall height, posts, or accessories, call Stratco on 1300 165 165 or visit your local Stratco store before starting your project.
Additional Hardaz® Landscaping Solutions
The Hardaz® range extends beyond retaining walls, offering practical solutions for a variety of landscaping projects.
Hardaz® Raised Garden Pegs
Perfect for raised garden beds, sandpits, and garden edging, Hardaz® galvanised steel support pegs provide a fast and simple way to secure timber structures.
Simply assemble your timber box, level it, and support the corners using the pegs.
Available in two sizes:
- One-rail height
- Two-rail height
Hardaz® Heavy-Duty Sleeper Stakes
Designed for sleeper edging, raised gardens, and substantial timber boxing applications, heavy-duty sleeper stakes provide a strong and reliable joining solution.
These stakes make it easy to secure sleepers while maintaining a clean and professional appearance.
Hardaz® Multi-Purpose Sleeper Stakes
Ideal for:
- Garden edging
- Timber supports
- General landscaping projects
These versatile stakes offer additional support wherever it's needed.
Hardaz® Support Pins
Support pins are an excellent choice for securing garden edging and boxing projects.
Their simple design makes installation quick and effective while providing reliable support when creating landscape borders and edging.
Create a Professional Landscaping Finish with Hardaz®
Whether you're building a retaining wall, creating a raised garden bed, or installing garden edging, the Hardaz® range offers practical solutions designed to save time and simplify installation.
With minimal excavation, no fasteners required, and a clean flush finish, the Hardaz® Retaining Wall System makes it easier than ever to achieve a professional-looking landscaping project.
For a closer look at the installation process, watch the video at the top of this blog and follow along as the retaining wall is assembled step-by-step.
If you have questions about your project or need help selecting the right Hardaz® components, call Stratco on 1300 165 165 or visit your local Stratco store. Our team can provide expert advice to help you achieve the best result for your outdoor space.
Explore the full Hardaz® range and start transforming your garden today.
Frequently Asked Questions
For the most economical use of timber, Hardaz® retaining wall posts should be installed at 1200mm centres.
No. The Hardaz® system is designed to securely hold timber rails without requiring fasteners, helping reduce installation time and labour costs.
Hardaz® retaining posts are designed to accommodate 150mm x 50mm and 200mm x 50mm timber rails.
Standard Hardaz® retaining walls are suitable for heights up to 600mm. Using heavy-duty beams, walls can be constructed up to 1 metre high.
Yes. Hardaz® products are ideal for raised garden beds, sleeper edging, garden borders, sandpits, and a variety of landscaping applications.
Hardaz® retaining walls are approximately one-third the thickness of conventional timber retaining walls, require less excavation, and do not need fasteners during installation, making them quicker and easier to build.
If you need assistance selecting products, planning your retaining wall, or understanding installation requirements, call Stratco on 1300 165 165 or visit your local Stratco store. Our team can help you choose the right Hardaz® solution for your project.