Calculate required pile stick-up for solar racking systems. Accounts for grade change between existing ground and finish grade at each pile location. Built for solar EPC crews and field engineers.
GPS rovers and total stations are the standard tools for pile stick-up verification on solar projects. Shop GPS/GNSS equipment at Express Tools.
Shop Express Tools →Pile stick-up is the height of exposed pile above finish grade — the foundation measurement that controls panel height across the entire array. On a typical utility-scale solar site, thousands of piles must be driven or installed to within ±1 inch of the design stick-up. A systematic approach to tracking pile elevations is critical for meeting racking specs and avoiding costly rework.
Pile stick-up (also called pile protrusion or exposed pile length) is the distance from the finish grade surface to the top of a driven or helical pile. This dimension determines where the solar racking system sits relative to the ground. Correct stick-up ensures the panel bottom chord meets the design clearance height above finish grade.
Most solar racking manufacturers and EPC contractors specify ±1 inch (±25mm) tolerance on pile stick-up. Some systems allow up to ±2 inches, but tighter tolerances reduce clamp adjustment requirements. Always check the racking system IOM (Installation and Operations Manual) for specific tolerances.
When finish grade is higher than existing ground (fill added), the pile needs less stick-up because the ground surface is higher. When finish grade is lower than existing ground (cut required), more pile must stick up above the new lower grade. This calculator accounts for grade change at each pile location.
Too short: Panel bottom chord may be too close to or below design clearance height, causing shading, vegetation contact, or code violations. Too tall: Excess racking adjustments are needed, affecting structural capacity and increasing install time. Piles that miss tolerance typically require coupler extensions, field cuts, or re-drives.
Use a tape measure from the finish grade surface to the top of the pile cap or pile tube end. On graded sites, use a laser level or auto level to establish a control elevation, then measure from a grade stake or string line to the pile top. Record each pile location in the as-built documentation.
Bottom chord to finish grade
Survey elevation at pile location
Design grade at pile location