| Wind zone | Low risk | Low wind zone as described by NZS 3604:1999 |
| | Medium risk | Medium wind zone as described by NZS 3604:1999 |
| | High risk | High wind zone as described by NZS 3604:1999 |
| | Very high risk | Very high wind zone as described by NZS 3604:1999 |
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| Number of storeys | Low risk | One storey |
| | Medium risk | Two storeys in part |
| | High risk | Two storeys |
| | Very high risk | More than 2 storeys |
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| Roof/elevation intersection design | Low risk | Roof-to-elevation intersection fully protected (for example, hip and gable roof with eaves) |
| | Medium risk | Roof-to-elevation intersection partly exposed (for example, hip and gable roof with no eaves) |
| | High risk | Roof-to-elevation intersection fully exposed (for example, parapets, enclosed balustrades, or eaves at greater than 90° to vertical with soffit lining) |
| | Very high risk | Roof elements finishing within the boundaries formed by the external elevations (for example, lower ends of aprons, chimneys, dormers, etc) |
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| Eaves width (1) (2) | Low risk | Greater than 600 mm for single storey |
| | Medium risk | 451–500 mm for single storey, or greater than 600 mm for 2 storey |
| | High risk | 101–450 mm for single storey, or 451–500 mm for 2 storey, or greater than 600 mm above 2 storey |
| | Very high risk | 0–100 mm for single storey, or 0–450 mm for 2 storey. or less than 600 mm above 2 storey |
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| Envelope complexity | Low risk | Simple rectangular, L, T, or boomerang shape, with single cladding type |
| | Medium risk | Moderately complex, angular, or curved shapes (for example, Y or arrowhead) with no more than 2 cladding types |
| | High risk | Complex, angular, or curved shapes (for example, Y or arrowhead) with multiple cladding types |
| | Very high risk | As for high risk, but with junctions not covered in the rows of this table relating to roof/elevation intersection design and deck design (for example, box windows, pergolas, or multi-storey re-entrant shapes) |
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| Deck design (3) | Low risk | None, timber slat deck or porch at ground-floor level |
| | Medium risk | Fully covered in plan by roof, or timber slat deck attached at first- or second-floor level |
| | High risk | Enclosed deck exposed in plan or cantilevered at first-floor level |
| | Very high risk | Enclosed deck exposed in plan or cantilevered at second-floor level or above |
Notes (1)Eaves width measured horizontally from external face of wall cladding to outer edge of overhang, including gutters and fascias. (2)Balustrades and parapets count as 0 mm eaves. (3)Deck— (a)means an open platform (which may be known as a balcony)— (i)projecting from an exterior wall of a building; and (ii)supported by framing; and (iii)that may be over enclosed internal spaces, or may be open underneath; and
(b)includes an enclosed deck (that is, a deck (which may be known as a balcony)— (i)over an interior or exterior space; and (ii)that has an impermeable upper surface; and (iii)that is closed on the underside).
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