506.2.3 Single-occupancy, multistory buildings.
BC § 506.2.3
The allowable area of a single-occupancy building with more than one story above grade plane shall be determined in accordance with Equation 5-2: Aa = [At + (NS × If )] × Sa (Equation 5-2) where: Aa = Allowable area (square feet). At = Tabular allowable area factor (NS, S13D, S13R or SM value, as applicable) in accordance with Table 506.2. NS = Tabular allowable area factor in accordance with Table 506.2 for a nonsprinklered building (regardless of whether the building is sprinklered). If Area factor increase due to frontage (percent) as calculated in accordance with Section 506.3. Sa Actual number of building stories above grade plane, not to exceed three. For buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2, use the actual number of building stories above grade plane, not to exceed four. No individual story shall exceed the allowable area (Aa) as determined by Equation 5-2 using the value of Sa = 1.
