Concrete Repair Spurs: How They Work and How to Install Them
Introduction: Why Fence Posts Fail
Wooden fence posts are one of the most common failure points in any fence line. Over time, timber posts can rot at ground level where moisture sits in the soil, eventually weakening the fence until it leans or breaks. High winds and poor drainage can accelerate this process.
Replacing an entire post or fence line can be costly and disruptive — especially if access is limited or the fence still has plenty of life left in its panels and rails. This is where a concrete repair spur becomes the ideal solution.
What is a Concrete Repair Spur?
A concrete repair spur is a 1.2m (4ft) reinforced concrete post, usually 100mm x 100mm square, with three pre-drilled fixing holes. It is designed to be concreted into the ground right next to a damaged timber post.
Once set in position, the spur is bolted to the failing post using coach screws and washers, effectively bracing it and pulling the fence line back upright. Instead of replacing the whole post, you’re adding a permanent concrete support that takes over the load.
Why Choose a Repair Spur Instead of a New Post?
-
Cost-effective → Installing a spur can extend the lifespan of a fence by 5–10 years, avoiding the need for full replacement.
-
Less disruption → Panels, rails, gravel boards, and capping can remain in place — you only need access to one side of the fence.
-
Time saving → A spur can be installed in less than an hour once the hole is dug.
-
Durability → Reinforced concrete is weatherproof and rot-proof, unlike timber.
-
Sustainability → By repairing instead of replacing, you reduce waste and the need for new timber.
-
Future prevention → New posts can be protected with Postsaver Sleeves to stop ground-level rot.
Step-by-Step Guide: How to Fit a Concrete Repair Spur
1. Assess the Post
Check if the fence is worth repairing. If panels, rails, and gravel boards are still in good condition, a spur is ideal. If everything is failing, full replacement may be better.
2. Dig the Hole
-
Dig directly next to the damaged post, ideally at the front.
-
Depth: at least 2ft (60cm) to ensure stability.
-
Go slightly below the rot line so fresh concrete sets beneath the weak section.
-
Leave room behind the spur for the Post Mix to pack in and hold it securely.
3. Position the Spur
-
Place the 1.2m concrete spur tight against the wooden post.
-
Use a level to check it is vertical in both directions.
-
The pre-drilled holes should align to the mid-section of the timber post.
4. Concrete into Place
-
Use 1.5–2 bags of Post Mix per spur.
-
Pour Post Mix around the spur and add water as directed.
-
Keep the spur upright and snug against the wooden post while the mix sets.
-
Allow at least 10–15 minutes for initial firming.
5. Realign the Fence
-
As the mix firms, gently pull the leaning post back upright against the spur.
-
This restores the line of the fence without dismantling panels or rails.
6. Bolt the Spur to the Post
-
Use 3 × M10 x 180mm coach screws and M10 square washers.
-
Drill through the spur’s fixing holes into the timber post (at least 80mm penetration).
-
Tighten the screws gradually — the washers spread the force and stop splitting.
-
As you tighten, the post is pulled firmly against the spur.
FAQ: Common Questions About Repair Spurs
How deep should a repair spur be set?
A: At least 2ft (60cm) deep. This depth provides the stability needed to support the leaning post and resist wind loads.
How many bags of Post Mix do I need?
A: Typically 1.5–2 bags per spur. More may be required in sandy or loose soil conditions to ensure a solid hold.
Can I fit a repair spur without removing panels?
A: Yes — one of the main benefits of repair spurs is that they can be installed from one side without dismantling panels, rails, or gravel boards.
Will the fence look odd with a spur?
A: Not at all. Concrete repair spurs are slim and sit flush to the post. Many homeowners prefer the appearance of a reinforced spur over a leaning fence.
How long will a repair spur last?
A: Being concrete and rot-proof, repair spurs are designed to last for decades — often outliving the rest of the fence.
The Key Use Cases for Repair Spurs
-
Rotten timber posts at ground level.
-
Leaning fences caused by wind damage.
-
Limited access fences where replacing posts is impractical.
-
Budget-conscious repairs where replacing an entire fence line isn’t necessary.
Final Thoughts
Concrete repair spurs are one of the simplest and most cost-effective ways to restore a failing fence post. Instead of replacing whole sections, you can strengthen the existing structure, save money, and extend the life of your fence by years.
With just a spade, level, Post Mix, and coach screws, a single person can complete the repair in under an hour. For homeowners and tradespeople alike, repair spurs are a smart choice for keeping fences upright and strong without the cost of full replacement.
