Installing concrete fence posts with MGM timber systems delivers long lasting security and a clean boundary look for residential and light commercial sites. This guide outlines practical steps, material checks, and layout tips to ensure each post is stable and properly aligned.
By following a clear sequence for hole digging, base preparation, and post setting, you reduce rework and improve the durability of the overall fence line.
| Post Type | Typical Use | Depth Rule (mm) | Recommended Base Material |
|---|---|---|---|
| Round concrete posts | Standard residential boundary | 1/3 of above ground height | Compacted gravel or granular mix |
| Rectangular posts | Driveway gates and main entrances | Minimum 600 mm in most soils | Concrete mix for permanent setting |
| Heavier grade MGM timber system posts | Commercial frontages and high wind areas | Up to 1000 mm for tall runs | Postcrete or compacted aggregate |
| Corner and terminal posts | Angle changes and fence ends | Deeper than line posts for bracing | Concrete with steel reinforcement |
Site Layout And Planning For Concrete Posts
Accurate layout prevents gaps and keeps the fence line true across slopes and obstacles. Start by marking the exact property line and any fixed reference points such as walls or existing structures.
Use batter boards and a line level to establish consistent heights, especially when the ground is uneven or the fence runs over a distance.
Post Hole Dimensions And Base Preparation
The hole size and base material directly affect load distribution and long term movement control for each post.
- Measure hole diameter at least 3 to 4 times the width of the post for easy concrete placement.
- Set depth based on a third of the above ground height for standard soils, or go deeper on slopes and sandy ground.
- Place a compacted gravel layer at the bottom to improve drainage and prevent water pooling around the base.
- Use Postcrete or a rich cement mix to create a solid socket that locks the post firmly in place.
Setting And Aligning Concrete Posts
Setting is the stage where you achieve plumb, level positions before the base hardens.
Positioning And Leveling
Insert the post into the hole and check vertical alignment with a spirit level on multiple faces. Adjust by adding or removing base gravel rather than tilting the post itself.
Bracing And Ties
Install temporary diagonal bracing for taller runs and for corner posts, using timber or metal props that hold the post steady while the base mix cures.
Finishing, Sealing, And Long Term Protection
Once the concrete has cured and any temporary bracing is removed, focus on sealing joints and end grain to extend the life of the fence line.
- Apply a quality water repellent to the lower portion of each post to reduce moisture penetration.
- Check for movement after the first heavy rain or wind event and tighten any fixings if needed.
- Add caps, decorative features, or privacy boarding only after confirming that posts are fully stable.
- Schedule a visual inspection at least once a year to catch soil erosion, cracks, or leaning early.
Key Takeaways For MGM Timber Concrete Fence Installation
Successful installation relies on careful planning, correct depth and base materials, and disciplined curing before final fittings.
FAQ
Reader questions
How deep should I set a standard concrete post in normal garden soil?
Set the post at least one third of its above ground height into the soil, with a minimum practical depth of around 600 mm for line posts in normal conditions.
Can I set a concrete post in dry compacted soil without gravel base?
It is strongly recommended to use a compacted gravel base and a proper cement or Postcrete setting mix to prevent settling and water damage over time.
How long should I wait before attaching fence rails to new posts?
Allow the concrete or Postcrete to fully cure, typically 24 to 48 hours before applying significant loads, and longer in cool or wet weather.
What should I do if a post leans slightly after the concrete hardens?
Minor adjustments can sometimes be made with shims or by carefully repositioning under load, but significant lean usually requires resetting the post.