Horizontal and Vertical Control

Before Construction: new control points around the site must be established with high accuracy. Additional points inside the site are then established. All points must be “tied out” for repositioning. These initial points should:
- Meet certain accuracy standards
- Be clearly marked, referenced, and recorded
- Be far enough to be safe during construction.
During Construction: additional control is extended by the contractor as needed, around or inside the structure. These additional points should be close enough to the structure so that workers with simple equipment can use them