| Assembly | Roof Zone, Fastener per Polyiso Board | ||
| Field | Perimeter | Corner | |
| Case 1 | 5 | 5 | 5 |
| Case 2 | 8 | 15 | 20 |
| Case 3 | 8 | 12 | 16 |
| Case 4 | 0 | 0 | 0 |