Construction layout is one of the most difficult services to accurately estimate as a construction site is a place of constant change.
- Rough Staking for viewing, clearing, excavation or site preparation: Witness stakes are set at the key locations. These stakes are typically set within 0.1' of the point they represent. On occasion, they are roughly set within 0.5' of the point they represent.
- Staking for footings: Once a foundation hole is excavated, hub stakes are set with tacks in the top representing the location of the exterior of the foundation wall. The stakes will extend above the ground by about 0.1' and the tacks will be set within 0.02' of the points they represent.
- Pinning for forms: Once the footing is poured, fluted masonry nails will be set in the concrete representing the location of the exterior of the foundation wall. The nails will be set within 0.02' of the points they represent.
There are two factors that can affect the amount of time required to set the stakes: loss of sight and loss of control.
The equipment used for the detailed staking requires line of sight to operate. When piles of excavated materials or parked construction equipment interfere with the line of sight, additional control must be set to see the points to be stakes.
The control is a network of semi-random points that are mathematically connected to the property lines, the existing site features and the proposed site features. Control points are not always set in the best locations for the layout of future additions. Control points are temporary points and can be easily lost on a construction site. When control points are lost, quite often control needs to be re-established for staking.