Where the design wind pressure exceeds 30 psf or where the limits of Table R703.3.1 are exceeded, the attachment of wall coverings shall be designed to resist the component and cladding loads specified in Table R301.2(2), adjusted for height and exposure in accordance with Table R301.2(3). For the determination of wall covering attachment, component and cladding loads shall be determined using an effective wind area of 10 square feet (0.93 m2).
LIMITS FOR ATTACHMENT PER TABLE R703.3(1)
| MAXIMUM MEAN ROOF HEIGHT | |||
| Ultimate Wind Speed (mph 3-second gust) | Exposure | ||
| B | C | D | |
| 115 | NL | 50' | 20' |
| 120 | NL | 30' | DR |
| 130 | 60' | 15' | DR |
| 140 | 35' | DR | DR |
For SI: 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s.
NL = Not limited by Table R703.3.1, DR = Design required.