A post bracket is a metal fixing element that connects a timber post or column to a concrete base (pier, concrete slab, or foundation) without the timber touching the concrete directly. The post bracket keeps the timber off the ground and prevents moisture uptake and rot.
Types of post brackets
| Type | Fixing | Application |
|---|---|---|
| Adjustable post bracket | On threaded rod in concrete | Covered structure, carport, veranda (height adjustable) |
| Fixed post bracket (U-shape) | Bolts in concrete or anchor | Fence posts, light structures |
| Cast-in post bracket | Cast into concrete | New build, concrete piers |
| Ground anchor post bracket | Driven or screwed into ground | Quick installation, temporary structures |
Why use a post bracket?
Timber in direct contact with concrete or in the ground will rot, even pressure-treated timber:
- Concrete retains moisture → timber absorbs it
- In the ground, timber is in constant contact with moisture and organisms
The post bracket creates an air gap between timber and concrete. The timber can dry out and lasts much longer.
Installation (adjustable post bracket)
1. Cast in threaded rod — M16 threaded rod cast into the pier, protruding 10 cm
2. Let concrete cure — Minimum 7 days
3. Mount the post bracket — Screw onto the threaded rod, adjust to height
4. Place the post — Into the U-bracket, fix with coach bolts
Related terms
- Pier foundation
- Concrete pier
- Post
- Ground anchor