Training: Ground Mount Auditing

Ground mount systems are unique because they lack the structural support of a pre-existing roof. They are entirely dependent on the precision of the engineering plan (EP). Failure to follow these specs exactly can lead to catastrophic system failure, including panels catching wind like a sail and ripping the foundations out of the ground.

1. Structural Reinforcements (The "Details")

While a standard roof mount relies on rails, a ground mount uses a complex web of cross-members to maintain rigidity against lateral wind loads.

• Front-to-Back Cross Members: Refer to Detail A/B on page S-4.1. These prevent the "parallelogram" effect where the array could lean or collapse forward or backward.

• Rear Row Cross Members: Refer to Detail C on page S-4.1. This provides the lateral (side-to-side) stability for the tallest part of the structure.

  • Audit Check: Ensure all bolts are torqued and no members are substituted for different materials.

2. Foundation & Post Spacing

The strength of the system starts in the dirt. Unlike interior framing, you cannot "bridge" a missed stud here.

• Standard Spacing: Typically 80 inches apart (check page S-4.2 for project-specific variations).

• Embedment Depth: Always verify the post depth against the EP. If the soil was too rocky to hit the required depth, a Change Order (CO) must be documented immediately.

3. Array Pitch & Alignment

The pitch isn't just for production; it’s a structural calculation for wind uplift.

• Verification: Cross-reference the measured pitch against pages S-3 and S-5.

• Correction: If the physical pitch deviates by more than the allowed tolerance (usually +/- 5 degrees), Open a CO to address the height of the pier posts.