The formwork is ready. The concrete is booked. The crew is ready to pour.
But before the concrete goes in, has the slab setout been checked?
On many construction projects, survey verification is included as a hold point in the Inspection and Test Plan (ITP). This means the required checks need to be completed before the concrete pour can proceed.
For builders and contractors in Darwin and across the Northern Territory, getting this check done at the right time can help identify problems before they become costly rework.
What Is a Hold Point?
A hold point is a stage in construction where work stops until a required inspection or verification has been completed.
For a slab, the process may look like this: formwork ready, survey verification, hold point released, then the concrete pour. The exact requirements depend on the project’s ITP, contract and specifications.
A witness point is different. It generally gives a relevant party the opportunity to attend an inspection without stopping work if they cannot attend.
Why does this matter? A small positioning or level issue can become much more difficult to fix once the concrete has been poured. A setout survey allows the formwork to be checked while adjustments can still be made, helping avoid unnecessary rework and delays.
What Does a Surveyor Check Before a Slab Pour?
A setout survey verifies that the formwork has been positioned in accordance with the design. A construction surveyor may check:
- Slab position
- Levels
- Alignment
- Setbacks
- Key dimensions
- Survey control points
The aim is simple: make sure the construction is in the right place before it becomes permanent. If an issue is identified while the formwork is still accessible, it can usually be addressed before the concrete is poured.
Why Book the Survey Before the Pour?
One of the biggest scheduling mistakes is booking the surveyor for the concrete pour date rather than the formwork-ready date. If the survey identifies an issue, the builder needs time to make adjustments before the concrete arrives.
A better sequence is: formwork ready, setout check, adjustments if required, hold point release, then the pour.
What About Darwin’s Wet Season?
Construction scheduling in Darwin can be affected by wet weather, particularly during the wet season. Heavy rain can affect site access and concrete pour windows, making coordination between the builder, concrete contractor and construction surveyor even more important.
If the formwork-ready date changes, the survey appointment may need to change too. Planning the survey around the formwork, rather than simply the concrete booking, helps keep the process moving.
Is a Setout Survey Compulsory Before a Slab Pour?
There is no blanket Northern Territory requirement for a surveyor to verify every slab before it is poured. However, survey verification may be required by the project’s ITP, contract, engineering specifications or certification requirements.
The builder or project team should confirm what applies to the specific project. Where survey verification is a hold point, the required check should be completed before the pour proceeds.
Planning a Slab Pour in Darwin?
Territory Surveys provides construction surveying and setout services in Darwin and across the Northern Territory, supporting builders, contractors, engineers and project teams.
Have a slab pour coming up?
Talk to our team about your setout survey requirements.