Roof Board Fastener and Plate Count by Zone
Fasteners and plates for mechanically-attached roof insulation, by wind-uplift zone: fasteners = field boards x field rate + perimeter boards x perimeter rate + corner boards x corner rate; plates = fasteners (one each). 100 field boards at 8, 20 perimeter at 12, and 5 corner at 16 is 1,120 fasteners and plates; a high-wind field pattern of 12 raises it to 1,520. The zone densities come from the manufacturer's FM or UL uplift design. Distinct from the shingle and panel fastener tiles.
Formula and source
fasteners = field_boards x field_per_board + perimeter_boards x perimeter_per_board + corner_boards x corner_per_board; plates = fasteners.
Roof-board fastener identity by name (sum of zone boards x zone rate; one plate per fastener); first-principles count arithmetic.
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