How do I verify that my Unirac GFT quote includes the right number of piles, and how far apart can the piles be spaced?
Unirac has certification letters for their GFT system from more than half of all states in the US (find the resource hub on their technical support page). In most of these certification letters, you can find tables specifying the number of piles required, the distance between piles, and the maximum cantilever. To make sure you’re looking at the right table, have the following information on hand:
Wind exposure (B or C): _____
Wind load [mph]: _____
Snow load [psf]: _____
Module size (60-cell or 72-cell): _____
Pile foundation (driven or concrete): _____
Subarray or table size (2x4 to 2x30): _____
For example, let’s say we have a system in Michigan with the following characteristics:
Wind exposure (B or C): C
Wind load [mph]: <100 mph
Snow load [psf]: <30 psf
Module size (60-cell or 72-cell): 72-cell
Pile foundation (driven or concrete): Concrete
Subarray or table size (2x4 to 2x30): 2x10
According to the certification letter, we would have (5) piles spaced up to a maximum of 7’-0” apart with a maximum cantilever of 2’7 5/8”:
If your state does not have a certification letter with tables and you’d like to verify your system’s BOM, please contact Unirac directly.
RENVU does not guarantee that the system design resulting from this evaluation is appropriate for your needs, nor does the system design address the adequacy of the foundation/structure upon which the system will be installed. Please ensure the system is installed in a code compliant manner based on accurate site information.