Roof Board Fastener and Plate Count by Zone
Fasteners and plates for mechanically-attached roof insulation, by wind-uplift zone.
Example
You enter
- Field-zone boards 100
- Fasteners per field board 8
- Perimeter-zone boards 20
- Fasteners per perimeter board 12
- Corner-zone boards 5
- Fasteners per corner board 16
You get
- Fasteners 1,120
- Plates 1,120 plates (one per fastener)
No published worked example is on file for this calculation. It is checked against a hand-worked derivation of its method and an independent reference test.
Details, formula, and sources
Scopefasteners = 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 shingle and panel fasteners.
Formula or tablefasteners = field_boards x field_per_board + perimeter_boards x perimeter_per_board + corner_boards x corner_per_board; plates = fasteners.
Source and editionRoof-board fastener identity by name (sum of zone boards x zone rate; one plate per fastener); first-principles count arithmetic.
Free accessThe count arithmetic is public first-principles; the zone fastening densities come from the manufacturer's wind-uplift design (no copyrighted uplift table reproduced).
What governsEstimate. AHJ and licensed professional govern.
API field namesfield_boards, field_per_board, perimeter_boards, perimeter_per_board, corner_boards, corner_per_board, fasteners, plates
- Zone rates field / perimeter / corner fasteners per board from the FM or UL uplift design (entered)membrane manufacturer
- Plates one plate per fastener for mechanically-attached board and membraneinstallation practice