A concrete pier is a precast or site-cast concrete block that serves as a foundation point, onto which a post bracket and timber post are placed. It is the most commonly used foundation method for lighter structures such as garden buildings, canopies, decks and carports.
> See also: Pier — the more detailed article on pier foundations.
Precast concrete piers
Available at the DIY store in standard sizes:
| Dimension | Weight | Suited for |
|---|---|---|
| 20 x 20 x 40 cm | approx. 15 kg | Light structures, decks |
| 30 x 30 x 30 cm | approx. 25 kg | Garden buildings, light canopies |
| 40 x 40 x 40 cm | approx. 55 kg | Canopies, carports |
| 50 x 50 x 50 cm | approx. 110 kg | Large structures, garages |
Placement
1. Dig a hole (deeper than the pier, + 10 cm of gravel underneath)
2. Compact the gravel bed
3. Place the pier, level it
4. Check diagonal measurements (all piers relative to each other)
5. Fit the post bracket
6. Backfill around the pier with soil or gravel
Related terms
- Pier
- Post bracket
- Ground anchor
- Shallow foundation