- Hole schedule
- A list of hole positions, diameters and depths for a fence, pergola or footing job. It usually comes from the engineer, builder or product supplier, and the driller works to it exactly rather than estimating sizes on site from experience.
- Embedment depth
- How far a post sits below ground, as specified by the engineer or product supplier. It depends on post height, wind loading and soil type, and an embedment that is too shallow can let fences and pergolas lean or fail.
- Refusal
- When the auger cannot go deeper because of rock or hard material. Refusal should be recorded with the actual depth reached, so the engineer or builder can decide whether to accept it, redesign the footing, or use another drilling method.
- Spoil
- The soil lifted out by the auger, which needs somewhere to go. It can be spread on garden beds, stockpiled for reuse or removed from site, but should be kept well away from drains, gutters, stormwater pits and neighbouring property.
- Bell-out
- A widened base on some footings, used only where the design requires it. A bell-out spreads the load over more ground and helps resist uplift, but it needs suitable, stable soil conditions and the correct tooling to form it properly.
- Pier
- A column of concrete cast in a drilled hole to carry a deck, pergola or building load. Pier sizes, depths and any reinforcement come from the engineer, and the open hole may need inspection by the engineer or certifier before concrete is poured.